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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0-only
 /******************************************************************************
  *
  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  *
  * Contact Information:
  *  Intel Linux Wireless <ilw@linux.intel.com>
  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  *****************************************************************************/
 
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/etherdevice.h>
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/lockdep.h>
 #include <linux/pci.h>
 #include <linux/dma-mapping.h>
 #include <linux/delay.h>
 #include <linux/skbuff.h>
 #include <net/mac80211.h>
 
 #include "common.h"
 
 int
 _il_poll_bit(struct il_priv *il, u32 addr, u32 bits, u32 mask, int timeout)
 {
     const int interval = 10; /* microseconds */
     int t = 0;
 
     do {
         if ((_il_rd(il, addr) & mask) == (bits & mask))
             return t;
         udelay(interval);
         t += interval;
     } while (t < timeout);
 
     return -ETIMEDOUT;
 }
 EXPORT_SYMBOL(_il_poll_bit);
 
 void
 il_set_bit(struct il_priv *p, u32 r, u32 m)
 {
     unsigned long reg_flags;
 
     spin_lock_irqsave(&p->reg_lock, reg_flags);
     _il_set_bit(p, r, m);
     spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 }
 EXPORT_SYMBOL(il_set_bit);
 
 void
 il_clear_bit(struct il_priv *p, u32 r, u32 m)
 {
     unsigned long reg_flags;
 
     spin_lock_irqsave(&p->reg_lock, reg_flags);
     _il_clear_bit(p, r, m);
     spin_unlock_irqrestore(&p->reg_lock, reg_flags);
 }
 EXPORT_SYMBOL(il_clear_bit);
 
 bool
 _il_grab_nic_access(struct il_priv *il)
 {
     int ret;
     u32 val;
 
     /* this bit wakes up the NIC */
     _il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
 
     /*
      * These bits say the device is running, and should keep running for
      * at least a short while (at least as long as MAC_ACCESS_REQ stays 1),
      * but they do not indicate that embedded SRAM is restored yet;
      * 3945 and 4965 have volatile SRAM, and must save/restore contents
      * to/from host DRAM when sleeping/waking for power-saving.
      * Each direction takes approximately 1/4 millisecond; with this
      * overhead, it's a good idea to grab and hold MAC_ACCESS_REQUEST if a
      * series of register accesses are expected (e.g. reading Event Log),
      * to keep device from sleeping.
      *
      * CSR_UCODE_DRV_GP1 register bit MAC_SLEEP == 0 indicates that
      * SRAM is okay/restored.  We don't check that here because this call
      * is just for hardware register access; but GP1 MAC_SLEEP check is a
      * good idea before accessing 3945/4965 SRAM (e.g. reading Event Log).
      *
      */
     ret =
         _il_poll_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_VAL_MAC_ACCESS_EN,
              (CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY |
               CSR_GP_CNTRL_REG_FLAG_GOING_TO_SLEEP), 15000);
     if (unlikely(ret < 0)) {
         val = _il_rd(il, CSR_GP_CNTRL);
         WARN_ONCE(1, "Timeout waiting for ucode processor access "
                  "(CSR_GP_CNTRL 0x%08x)\n", val);
         _il_wr(il, CSR_RESET, CSR_RESET_REG_FLAG_FORCE_NMI);
         return false;
     }
 
     return true;
 }
 EXPORT_SYMBOL_GPL(_il_grab_nic_access);
 
 int
 il_poll_bit(struct il_priv *il, u32 addr, u32 mask, int timeout)
 {
     const int interval = 10; /* microseconds */
     int t = 0;
 
     do {
         if ((il_rd(il, addr) & mask) == mask)
             return t;
         udelay(interval);
         t += interval;
     } while (t < timeout);
 
     return -ETIMEDOUT;
 }
 EXPORT_SYMBOL(il_poll_bit);
 
 u32
 il_rd_prph(struct il_priv *il, u32 reg)
 {
     unsigned long reg_flags;
     u32 val;
 
     spin_lock_irqsave(&il->reg_lock, reg_flags);
     _il_grab_nic_access(il);
     val = _il_rd_prph(il, reg);
     _il_release_nic_access(il);
     spin_unlock_irqrestore(&il->reg_lock, reg_flags);
     return val;
 }
 EXPORT_SYMBOL(il_rd_prph);
 
 void
 il_wr_prph(struct il_priv *il, u32 addr, u32 val)
 {
     unsigned long reg_flags;
 
     spin_lock_irqsave(&il->reg_lock, reg_flags);
     if (likely(_il_grab_nic_access(il))) {
         _il_wr_prph(il, addr, val);
         _il_release_nic_access(il);
     }
     spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 }
 EXPORT_SYMBOL(il_wr_prph);
 
 u32
 il_read_targ_mem(struct il_priv *il, u32 addr)
 {
     unsigned long reg_flags;
     u32 value;
 
     spin_lock_irqsave(&il->reg_lock, reg_flags);
     _il_grab_nic_access(il);
 
     _il_wr(il, HBUS_TARG_MEM_RADDR, addr);
     value = _il_rd(il, HBUS_TARG_MEM_RDAT);
 
     _il_release_nic_access(il);
     spin_unlock_irqrestore(&il->reg_lock, reg_flags);
     return value;
 }
 EXPORT_SYMBOL(il_read_targ_mem);
 
 void
 il_write_targ_mem(struct il_priv *il, u32 addr, u32 val)
 {
     unsigned long reg_flags;
 
     spin_lock_irqsave(&il->reg_lock, reg_flags);
     if (likely(_il_grab_nic_access(il))) {
         _il_wr(il, HBUS_TARG_MEM_WADDR, addr);
         _il_wr(il, HBUS_TARG_MEM_WDAT, val);
         _il_release_nic_access(il);
     }
     spin_unlock_irqrestore(&il->reg_lock, reg_flags);
 }
 EXPORT_SYMBOL(il_write_targ_mem);
 
 const char *
 il_get_cmd_string(u8 cmd)
 {
     switch (cmd) {
         IL_CMD(N_ALIVE);
         IL_CMD(N_ERROR);
         IL_CMD(C_RXON);
         IL_CMD(C_RXON_ASSOC);
         IL_CMD(C_QOS_PARAM);
         IL_CMD(C_RXON_TIMING);
         IL_CMD(C_ADD_STA);
         IL_CMD(C_REM_STA);
         IL_CMD(C_WEPKEY);
         IL_CMD(N_3945_RX);
         IL_CMD(C_TX);
         IL_CMD(C_RATE_SCALE);
         IL_CMD(C_LEDS);
         IL_CMD(C_TX_LINK_QUALITY_CMD);
         IL_CMD(C_CHANNEL_SWITCH);
         IL_CMD(N_CHANNEL_SWITCH);
         IL_CMD(C_SPECTRUM_MEASUREMENT);
         IL_CMD(N_SPECTRUM_MEASUREMENT);
         IL_CMD(C_POWER_TBL);
         IL_CMD(N_PM_SLEEP);
         IL_CMD(N_PM_DEBUG_STATS);
         IL_CMD(C_SCAN);
         IL_CMD(C_SCAN_ABORT);
         IL_CMD(N_SCAN_START);
         IL_CMD(N_SCAN_RESULTS);
         IL_CMD(N_SCAN_COMPLETE);
         IL_CMD(N_BEACON);
         IL_CMD(C_TX_BEACON);
         IL_CMD(C_TX_PWR_TBL);
         IL_CMD(C_BT_CONFIG);
         IL_CMD(C_STATS);
         IL_CMD(N_STATS);
         IL_CMD(N_CARD_STATE);
         IL_CMD(N_MISSED_BEACONS);
         IL_CMD(C_CT_KILL_CONFIG);
         IL_CMD(C_SENSITIVITY);
         IL_CMD(C_PHY_CALIBRATION);
         IL_CMD(N_RX_PHY);
         IL_CMD(N_RX_MPDU);
         IL_CMD(N_RX);
         IL_CMD(N_COMPRESSED_BA);
     default:
         return "UNKNOWN";
 
     }
 }
 EXPORT_SYMBOL(il_get_cmd_string);
 
 #define HOST_COMPLETE_TIMEOUT (HZ / 2)
 
 static void
 il_generic_cmd_callback(struct il_priv *il, struct il_device_cmd *cmd,
             struct il_rx_pkt *pkt)
 {
     if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
         IL_ERR("Bad return from %s (0x%08X)\n",
                il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
         return;
     }
 #ifdef CONFIG_IWLEGACY_DEBUG
     switch (cmd->hdr.cmd) {
     case C_TX_LINK_QUALITY_CMD:
     case C_SENSITIVITY:
         D_HC_DUMP("back from %s (0x%08X)\n",
               il_get_cmd_string(cmd->hdr.cmd), pkt->hdr.flags);
         break;
     default:
         D_HC("back from %s (0x%08X)\n", il_get_cmd_string(cmd->hdr.cmd),
              pkt->hdr.flags);
     }
 #endif
 }
 
 static int
 il_send_cmd_async(struct il_priv *il, struct il_host_cmd *cmd)
 {
     int ret;
 
     BUG_ON(!(cmd->flags & CMD_ASYNC));
 
     /* An asynchronous command can not expect an SKB to be set. */
     BUG_ON(cmd->flags & CMD_WANT_SKB);
 
     /* Assign a generic callback if one is not provided */
     if (!cmd->callback)
         cmd->callback = il_generic_cmd_callback;
 
     if (test_bit(S_EXIT_PENDING, &il->status))
         return -EBUSY;
 
     ret = il_enqueue_hcmd(il, cmd);
     if (ret < 0) {
         IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
                il_get_cmd_string(cmd->id), ret);
         return ret;
     }
     return 0;
 }
 
 int
 il_send_cmd_sync(struct il_priv *il, struct il_host_cmd *cmd)
 {
     int cmd_idx;
     int ret;
 
     lockdep_assert_held(&il->mutex);
 
     BUG_ON(cmd->flags & CMD_ASYNC);
 
     /* A synchronous command can not have a callback set. */
     BUG_ON(cmd->callback);
 
     D_INFO("Attempting to send sync command %s\n",
            il_get_cmd_string(cmd->id));
 
     set_bit(S_HCMD_ACTIVE, &il->status);
     D_INFO("Setting HCMD_ACTIVE for command %s\n",
            il_get_cmd_string(cmd->id));
 
     cmd_idx = il_enqueue_hcmd(il, cmd);
     if (cmd_idx < 0) {
         ret = cmd_idx;
         IL_ERR("Error sending %s: enqueue_hcmd failed: %d\n",
                il_get_cmd_string(cmd->id), ret);
         goto out;
     }
 
     ret = wait_event_timeout(il->wait_command_queue,
                  !test_bit(S_HCMD_ACTIVE, &il->status),
                  HOST_COMPLETE_TIMEOUT);
     if (!ret) {
         if (test_bit(S_HCMD_ACTIVE, &il->status)) {
             IL_ERR("Error sending %s: time out after %dms.\n",
                    il_get_cmd_string(cmd->id),
                    jiffies_to_msecs(HOST_COMPLETE_TIMEOUT));
 
             clear_bit(S_HCMD_ACTIVE, &il->status);
             D_INFO("Clearing HCMD_ACTIVE for command %s\n",
                    il_get_cmd_string(cmd->id));
             ret = -ETIMEDOUT;
             goto cancel;
         }
     }
 
     if (test_bit(S_RFKILL, &il->status)) {
         IL_ERR("Command %s aborted: RF KILL Switch\n",
                il_get_cmd_string(cmd->id));
         ret = -ECANCELED;
         goto fail;
     }
     if (test_bit(S_FW_ERROR, &il->status)) {
         IL_ERR("Command %s failed: FW Error\n",
                il_get_cmd_string(cmd->id));
         ret = -EIO;
         goto fail;
     }
     if ((cmd->flags & CMD_WANT_SKB) && !cmd->reply_page) {
         IL_ERR("Error: Response NULL in '%s'\n",
                il_get_cmd_string(cmd->id));
         ret = -EIO;
         goto cancel;
     }
 
     ret = 0;
     goto out;
 
 cancel:
     if (cmd->flags & CMD_WANT_SKB) {
         /*
          * Cancel the CMD_WANT_SKB flag for the cmd in the
          * TX cmd queue. Otherwise in case the cmd comes
          * in later, it will possibly set an invalid
          * address (cmd->meta.source).
          */
         il->txq[il->cmd_queue].meta[cmd_idx].flags &= ~CMD_WANT_SKB;
     }
 fail:
     if (cmd->reply_page) {
         il_free_pages(il, cmd->reply_page);
         cmd->reply_page = 0;
     }
 out:
     return ret;
 }
 EXPORT_SYMBOL(il_send_cmd_sync);
 
 int
 il_send_cmd(struct il_priv *il, struct il_host_cmd *cmd)
 {
     if (cmd->flags & CMD_ASYNC)
         return il_send_cmd_async(il, cmd);
 
     return il_send_cmd_sync(il, cmd);
 }
 EXPORT_SYMBOL(il_send_cmd);
 
 int
 il_send_cmd_pdu(struct il_priv *il, u8 id, u16 len, const void *data)
 {
     struct il_host_cmd cmd = {
         .id = id,
         .len = len,
         .data = data,
     };
 
     return il_send_cmd_sync(il, &cmd);
 }
 EXPORT_SYMBOL(il_send_cmd_pdu);
 
 int
 il_send_cmd_pdu_async(struct il_priv *il, u8 id, u16 len, const void *data,
               void (*callback) (struct il_priv *il,
                     struct il_device_cmd *cmd,
                     struct il_rx_pkt *pkt))
 {
     struct il_host_cmd cmd = {
         .id = id,
         .len = len,
         .data = data,
     };
 
     cmd.flags |= CMD_ASYNC;
     cmd.callback = callback;
 
     return il_send_cmd_async(il, &cmd);
 }
 EXPORT_SYMBOL(il_send_cmd_pdu_async);
 
 /* default: IL_LED_BLINK(0) using blinking idx table */
 static int led_mode;
 module_param(led_mode, int, 0444);
 MODULE_PARM_DESC(led_mode,
          "0=system default, " "1=On(RF On)/Off(RF Off), 2=blinking");
 
 /* Throughput       OFF time(ms)    ON time (ms)
  *  >300            25      25
  *  >200 to 300     40      40
  *  >100 to 200     55      55
  *  >70 to 100      65      65
  *  >50 to 70       75      75
  *  >20 to 50       85      85
  *  >10 to 20       95      95
  *  >5 to 10        110     110
  *  >1 to 5         130     130
  *  >0 to 1         167     167
  *  <=0                 SOLID ON
  */
 static const struct ieee80211_tpt_blink il_blink[] = {
     {.throughput = 0,       .blink_time = 334},
     {.throughput = 1 * 1024 - 1,    .blink_time = 260},
     {.throughput = 5 * 1024 - 1,    .blink_time = 220},
     {.throughput = 10 * 1024 - 1,   .blink_time = 190},
     {.throughput = 20 * 1024 - 1,   .blink_time = 170},
     {.throughput = 50 * 1024 - 1,   .blink_time = 150},
     {.throughput = 70 * 1024 - 1,   .blink_time = 130},
     {.throughput = 100 * 1024 - 1,  .blink_time = 110},
     {.throughput = 200 * 1024 - 1,  .blink_time = 80},
     {.throughput = 300 * 1024 - 1,  .blink_time = 50},
 };
 
 /*
  * Adjust led blink rate to compensate on a MAC Clock difference on every HW
  * Led blink rate analysis showed an average deviation of 0% on 3945,
  * 5% on 4965 HW.
  * Need to compensate on the led on/off time per HW according to the deviation
  * to achieve the desired led frequency
  * The calculation is: (100-averageDeviation)/100 * blinkTime
  * For code efficiency the calculation will be:
  *     compensation = (100 - averageDeviation) * 64 / 100
  *     NewBlinkTime = (compensation * BlinkTime) / 64
  */
 static inline u8
 il_blink_compensation(struct il_priv *il, u8 time, u16 compensation)
 {
     if (!compensation) {
         IL_ERR("undefined blink compensation: "
                "use pre-defined blinking time\n");
         return time;
     }
 
     return (u8) ((time * compensation) >> 6);
 }
 
 /* Set led pattern command */
 static int
 il_led_cmd(struct il_priv *il, unsigned long on, unsigned long off)
 {
     struct il_led_cmd led_cmd = {
         .id = IL_LED_LINK,
         .interval = IL_DEF_LED_INTRVL
     };
     int ret;
 
     if (!test_bit(S_READY, &il->status))
         return -EBUSY;
 
     if (il->blink_on == on && il->blink_off == off)
         return 0;
 
     if (off == 0) {
         /* led is SOLID_ON */
         on = IL_LED_SOLID;
     }
 
     D_LED("Led blink time compensation=%u\n",
           il->cfg->led_compensation);
     led_cmd.on =
         il_blink_compensation(il, on,
                   il->cfg->led_compensation);
     led_cmd.off =
         il_blink_compensation(il, off,
                   il->cfg->led_compensation);
 
     ret = il->ops->send_led_cmd(il, &led_cmd);
     if (!ret) {
         il->blink_on = on;
         il->blink_off = off;
     }
     return ret;
 }
 
 static void
 il_led_brightness_set(struct led_classdev *led_cdev,
               enum led_brightness brightness)
 {
     struct il_priv *il = container_of(led_cdev, struct il_priv, led);
     unsigned long on = 0;
 
     if (brightness > 0)
         on = IL_LED_SOLID;
 
     il_led_cmd(il, on, 0);
 }
 
 static int
 il_led_blink_set(struct led_classdev *led_cdev, unsigned long *delay_on,
          unsigned long *delay_off)
 {
     struct il_priv *il = container_of(led_cdev, struct il_priv, led);
 
     return il_led_cmd(il, *delay_on, *delay_off);
 }
 
 void
 il_leds_init(struct il_priv *il)
 {
     int mode = led_mode;
     int ret;
 
     if (mode == IL_LED_DEFAULT)
         mode = il->cfg->led_mode;
 
     il->led.name =
         kasprintf(GFP_KERNEL, "%s-led", wiphy_name(il->hw->wiphy));
     il->led.brightness_set = il_led_brightness_set;
     il->led.blink_set = il_led_blink_set;
     il->led.max_brightness = 1;
 
     switch (mode) {
     case IL_LED_DEFAULT:
         WARN_ON(1);
         break;
     case IL_LED_BLINK:
         il->led.default_trigger =
             ieee80211_create_tpt_led_trigger(il->hw,
                              IEEE80211_TPT_LEDTRIG_FL_CONNECTED,
                              il_blink,
                              ARRAY_SIZE(il_blink));
         break;
     case IL_LED_RF_STATE:
         il->led.default_trigger = ieee80211_get_radio_led_name(il->hw);
         break;
     }
 
     ret = led_classdev_register(&il->pci_dev->dev, &il->led);
     if (ret) {
         kfree(il->led.name);
         return;
     }
 
     il->led_registered = true;
 }
 EXPORT_SYMBOL(il_leds_init);
 
 void
 il_leds_exit(struct il_priv *il)
 {
     if (!il->led_registered)
         return;
 
     led_classdev_unregister(&il->led);
     kfree(il->led.name);
 }
 EXPORT_SYMBOL(il_leds_exit);
 
 /************************** EEPROM BANDS ****************************
  *
  * The il_eeprom_band definitions below provide the mapping from the
  * EEPROM contents to the specific channel number supported for each
  * band.
  *
  * For example, il_priv->eeprom.band_3_channels[4] from the band_3
  * definition below maps to physical channel 42 in the 5.2GHz spectrum.
  * The specific geography and calibration information for that channel
  * is contained in the eeprom map itself.
  *
  * During init, we copy the eeprom information and channel map
  * information into il->channel_info_24/52 and il->channel_map_24/52
  *
  * channel_map_24/52 provides the idx in the channel_info array for a
  * given channel.  We have to have two separate maps as there is channel
  * overlap with the 2.4GHz and 5.2GHz spectrum as seen in band_1 and
  * band_2
  *
  * A value of 0xff stored in the channel_map indicates that the channel
  * is not supported by the hardware at all.
  *
  * A value of 0xfe in the channel_map indicates that the channel is not
  * valid for Tx with the current hardware.  This means that
  * while the system can tune and receive on a given channel, it may not
  * be able to associate or transmit any frames on that
  * channel.  There is no corresponding channel information for that
  * entry.
  *
  *********************************************************************/
 
 /* 2.4 GHz */
 const u8 il_eeprom_band_1[14] = {
     1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14
 };
 
 /* 5.2 GHz bands */
 static const u8 il_eeprom_band_2[] = {  /* 4915-5080MHz */
     183, 184, 185, 187, 188, 189, 192, 196, 7, 8, 11, 12, 16
 };
 
 static const u8 il_eeprom_band_3[] = {  /* 5170-5320MHz */
     34, 36, 38, 40, 42, 44, 46, 48, 52, 56, 60, 64
 };
 
 static const u8 il_eeprom_band_4[] = {  /* 5500-5700MHz */
     100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140
 };
 
 static const u8 il_eeprom_band_5[] = {  /* 5725-5825MHz */
     145, 149, 153, 157, 161, 165
 };
 
 static const u8 il_eeprom_band_6[] = {  /* 2.4 ht40 channel */
     1, 2, 3, 4, 5, 6, 7
 };
 
 static const u8 il_eeprom_band_7[] = {  /* 5.2 ht40 channel */
     36, 44, 52, 60, 100, 108, 116, 124, 132, 149, 157
 };
 
 /******************************************************************************
  *
  * EEPROM related functions
  *
 ******************************************************************************/
 
 static int
 il_eeprom_verify_signature(struct il_priv *il)
 {
     u32 gp = _il_rd(il, CSR_EEPROM_GP) & CSR_EEPROM_GP_VALID_MSK;
     int ret = 0;
 
     D_EEPROM("EEPROM signature=0x%08x\n", gp);
     switch (gp) {
     case CSR_EEPROM_GP_GOOD_SIG_EEP_LESS_THAN_4K:
     case CSR_EEPROM_GP_GOOD_SIG_EEP_MORE_THAN_4K:
         break;
     default:
         IL_ERR("bad EEPROM signature," "EEPROM_GP=0x%08x\n", gp);
         ret = -ENOENT;
         break;
     }
     return ret;
 }
 
 const u8 *
 il_eeprom_query_addr(const struct il_priv *il, size_t offset)
 {
     BUG_ON(offset >= il->cfg->eeprom_size);
     return &il->eeprom[offset];
 }
 EXPORT_SYMBOL(il_eeprom_query_addr);
 
 u16
 il_eeprom_query16(const struct il_priv *il, size_t offset)
 {
     if (!il->eeprom)
         return 0;
     return (u16) il->eeprom[offset] | ((u16) il->eeprom[offset + 1] << 8);
 }
 EXPORT_SYMBOL(il_eeprom_query16);
 
 /*
  * il_eeprom_init - read EEPROM contents
  *
  * Load the EEPROM contents from adapter into il->eeprom
  *
  * NOTE:  This routine uses the non-debug IO access functions.
  */
 int
 il_eeprom_init(struct il_priv *il)
 {
     __le16 *e;
     u32 gp = _il_rd(il, CSR_EEPROM_GP);
     int sz;
     int ret;
     int addr;
 
     /* allocate eeprom */
     sz = il->cfg->eeprom_size;
     D_EEPROM("NVM size = %d\n", sz);
     il->eeprom = kzalloc(sz, GFP_KERNEL);
     if (!il->eeprom)
         return -ENOMEM;
 
     e = (__le16 *) il->eeprom;
 
     il->ops->apm_init(il);
 
     ret = il_eeprom_verify_signature(il);
     if (ret < 0) {
         IL_ERR("EEPROM not found, EEPROM_GP=0x%08x\n", gp);
         ret = -ENOENT;
         goto err;
     }
 
     /* Make sure driver (instead of uCode) is allowed to read EEPROM */
     ret = il->ops->eeprom_acquire_semaphore(il);
     if (ret < 0) {
         IL_ERR("Failed to acquire EEPROM semaphore.\n");
         ret = -ENOENT;
         goto err;
     }
 
     /* eeprom is an array of 16bit values */
     for (addr = 0; addr < sz; addr += sizeof(u16)) {
         u32 r;
 
         _il_wr(il, CSR_EEPROM_REG,
                CSR_EEPROM_REG_MSK_ADDR & (addr << 1));
 
         ret =
             _il_poll_bit(il, CSR_EEPROM_REG,
                  CSR_EEPROM_REG_READ_VALID_MSK,
                  CSR_EEPROM_REG_READ_VALID_MSK,
                  IL_EEPROM_ACCESS_TIMEOUT);
         if (ret < 0) {
             IL_ERR("Time out reading EEPROM[%d]\n", addr);
             goto done;
         }
         r = _il_rd(il, CSR_EEPROM_REG);
         e[addr / 2] = cpu_to_le16(r >> 16);
     }
 
     D_EEPROM("NVM Type: %s, version: 0x%x\n", "EEPROM",
          il_eeprom_query16(il, EEPROM_VERSION));
 
     ret = 0;
 done:
     il->ops->eeprom_release_semaphore(il);
 
 err:
     if (ret)
         il_eeprom_free(il);
     /* Reset chip to save power until we load uCode during "up". */
     il_apm_stop(il);
     return ret;
 }
 EXPORT_SYMBOL(il_eeprom_init);
 
 void
 il_eeprom_free(struct il_priv *il)
 {
     kfree(il->eeprom);
     il->eeprom = NULL;
 }
 EXPORT_SYMBOL(il_eeprom_free);
 
 static void
 il_init_band_reference(const struct il_priv *il, int eep_band,
                int *eeprom_ch_count,
                const struct il_eeprom_channel **eeprom_ch_info,
                const u8 **eeprom_ch_idx)
 {
     u32 offset = il->cfg->regulatory_bands[eep_band - 1];
 
     switch (eep_band) {
     case 1:     /* 2.4GHz band */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_1);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_1;
         break;
     case 2:     /* 4.9GHz band */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_2);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_2;
         break;
     case 3:     /* 5.2GHz band */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_3);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_3;
         break;
     case 4:     /* 5.5GHz band */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_4);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_4;
         break;
     case 5:     /* 5.7GHz band */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_5);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_5;
         break;
     case 6:     /* 2.4GHz ht40 channels */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_6);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_6;
         break;
     case 7:     /* 5 GHz ht40 channels */
         *eeprom_ch_count = ARRAY_SIZE(il_eeprom_band_7);
         *eeprom_ch_info =
             (struct il_eeprom_channel *)il_eeprom_query_addr(il,
                                      offset);
         *eeprom_ch_idx = il_eeprom_band_7;
         break;
     default:
         BUG();
     }
 }
 
 #define CHECK_AND_PRINT(x) ((eeprom_ch->flags & EEPROM_CHANNEL_##x) \
                 ? # x " " : "")
 /*
  * il_mod_ht40_chan_info - Copy ht40 channel info into driver's il.
  *
  * Does not set up a command, or touch hardware.
  */
 static int
 il_mod_ht40_chan_info(struct il_priv *il, enum nl80211_band band, u16 channel,
               const struct il_eeprom_channel *eeprom_ch,
               u8 clear_ht40_extension_channel)
 {
     struct il_channel_info *ch_info;
 
     ch_info =
         (struct il_channel_info *)il_get_channel_info(il, band, channel);
 
     if (!il_is_channel_valid(ch_info))
         return -1;
 
     D_EEPROM("HT40 Ch. %d [%sGHz] %s%s%s%s%s(0x%02x %ddBm):"
          " Ad-Hoc %ssupported\n", ch_info->channel,
          il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
          CHECK_AND_PRINT(IBSS), CHECK_AND_PRINT(ACTIVE),
          CHECK_AND_PRINT(RADAR), CHECK_AND_PRINT(WIDE),
          CHECK_AND_PRINT(DFS), eeprom_ch->flags,
          eeprom_ch->max_power_avg,
          ((eeprom_ch->flags & EEPROM_CHANNEL_IBSS) &&
           !(eeprom_ch->flags & EEPROM_CHANNEL_RADAR)) ? "" : "not ");
 
     ch_info->ht40_eeprom = *eeprom_ch;
     ch_info->ht40_max_power_avg = eeprom_ch->max_power_avg;
     ch_info->ht40_flags = eeprom_ch->flags;
     if (eeprom_ch->flags & EEPROM_CHANNEL_VALID)
         ch_info->ht40_extension_channel &=
             ~clear_ht40_extension_channel;
 
     return 0;
 }
 
 #define CHECK_AND_PRINT_I(x) ((eeprom_ch_info[ch].flags & EEPROM_CHANNEL_##x) \
                 ? # x " " : "")
 
 /*
  * il_init_channel_map - Set up driver's info for all possible channels
  */
 int
 il_init_channel_map(struct il_priv *il)
 {
     int eeprom_ch_count = 0;
     const u8 *eeprom_ch_idx = NULL;
     const struct il_eeprom_channel *eeprom_ch_info = NULL;
     int band, ch;
     struct il_channel_info *ch_info;
 
     if (il->channel_count) {
         D_EEPROM("Channel map already initialized.\n");
         return 0;
     }
 
     D_EEPROM("Initializing regulatory info from EEPROM\n");
 
     il->channel_count =
         ARRAY_SIZE(il_eeprom_band_1) + ARRAY_SIZE(il_eeprom_band_2) +
         ARRAY_SIZE(il_eeprom_band_3) + ARRAY_SIZE(il_eeprom_band_4) +
         ARRAY_SIZE(il_eeprom_band_5);
 
     D_EEPROM("Parsing data for %d channels.\n", il->channel_count);
 
     il->channel_info =
         kcalloc(il->channel_count, sizeof(struct il_channel_info),
             GFP_KERNEL);
     if (!il->channel_info) {
         IL_ERR("Could not allocate channel_info\n");
         il->channel_count = 0;
         return -ENOMEM;
     }
 
     ch_info = il->channel_info;
 
     /* Loop through the 5 EEPROM bands adding them in order to the
      * channel map we maintain (that contains additional information than
      * what just in the EEPROM) */
     for (band = 1; band <= 5; band++) {
 
         il_init_band_reference(il, band, &eeprom_ch_count,
                        &eeprom_ch_info, &eeprom_ch_idx);
 
         /* Loop through each band adding each of the channels */
         for (ch = 0; ch < eeprom_ch_count; ch++) {
             ch_info->channel = eeprom_ch_idx[ch];
             ch_info->band =
                 (band ==
                  1) ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 
             /* permanently store EEPROM's channel regulatory flags
              *   and max power in channel info database. */
             ch_info->eeprom = eeprom_ch_info[ch];
 
             /* Copy the run-time flags so they are there even on
              * invalid channels */
             ch_info->flags = eeprom_ch_info[ch].flags;
             /* First write that ht40 is not enabled, and then enable
              * one by one */
             ch_info->ht40_extension_channel =
                 IEEE80211_CHAN_NO_HT40;
 
             if (!(il_is_channel_valid(ch_info))) {
                 D_EEPROM("Ch. %d Flags %x [%sGHz] - "
                      "No traffic\n", ch_info->channel,
                      ch_info->flags,
                      il_is_channel_a_band(ch_info) ? "5.2" :
                      "2.4");
                 ch_info++;
                 continue;
             }
 
             /* Initialize regulatory-based run-time data */
             ch_info->max_power_avg = ch_info->curr_txpow =
                 eeprom_ch_info[ch].max_power_avg;
             ch_info->scan_power = eeprom_ch_info[ch].max_power_avg;
             ch_info->min_power = 0;
 
             D_EEPROM("Ch. %d [%sGHz] " "%s%s%s%s%s%s(0x%02x %ddBm):"
                  " Ad-Hoc %ssupported\n", ch_info->channel,
                  il_is_channel_a_band(ch_info) ? "5.2" : "2.4",
                  CHECK_AND_PRINT_I(VALID),
                  CHECK_AND_PRINT_I(IBSS),
                  CHECK_AND_PRINT_I(ACTIVE),
                  CHECK_AND_PRINT_I(RADAR),
                  CHECK_AND_PRINT_I(WIDE),
                  CHECK_AND_PRINT_I(DFS),
                  eeprom_ch_info[ch].flags,
                  eeprom_ch_info[ch].max_power_avg,
                  ((eeprom_ch_info[ch].
                    flags & EEPROM_CHANNEL_IBSS) &&
                   !(eeprom_ch_info[ch].
                     flags & EEPROM_CHANNEL_RADAR)) ? "" :
                  "not ");
 
             ch_info++;
         }
     }
 
     /* Check if we do have HT40 channels */
     if (il->cfg->regulatory_bands[5] == EEPROM_REGULATORY_BAND_NO_HT40 &&
         il->cfg->regulatory_bands[6] == EEPROM_REGULATORY_BAND_NO_HT40)
         return 0;
 
     /* Two additional EEPROM bands for 2.4 and 5 GHz HT40 channels */
     for (band = 6; band <= 7; band++) {
         enum nl80211_band ieeeband;
 
         il_init_band_reference(il, band, &eeprom_ch_count,
                        &eeprom_ch_info, &eeprom_ch_idx);
 
         /* EEPROM band 6 is 2.4, band 7 is 5 GHz */
         ieeeband =
             (band == 6) ? NL80211_BAND_2GHZ : NL80211_BAND_5GHZ;
 
         /* Loop through each band adding each of the channels */
         for (ch = 0; ch < eeprom_ch_count; ch++) {
             /* Set up driver's info for lower half */
             il_mod_ht40_chan_info(il, ieeeband, eeprom_ch_idx[ch],
                           &eeprom_ch_info[ch],
                           IEEE80211_CHAN_NO_HT40PLUS);
 
             /* Set up driver's info for upper half */
             il_mod_ht40_chan_info(il, ieeeband,
                           eeprom_ch_idx[ch] + 4,
                           &eeprom_ch_info[ch],
                           IEEE80211_CHAN_NO_HT40MINUS);
         }
     }
 
     return 0;
 }
 EXPORT_SYMBOL(il_init_channel_map);
 
 /*
  * il_free_channel_map - undo allocations in il_init_channel_map
  */
 void
 il_free_channel_map(struct il_priv *il)
 {
     kfree(il->channel_info);
     il->channel_count = 0;
 }
 EXPORT_SYMBOL(il_free_channel_map);
 
 /*
  * il_get_channel_info - Find driver's ilate channel info
  *
  * Based on band and channel number.
  */
 const struct il_channel_info *
 il_get_channel_info(const struct il_priv *il, enum nl80211_band band,
             u16 channel)
 {
     int i;
 
     switch (band) {
     case NL80211_BAND_5GHZ:
         for (i = 14; i < il->channel_count; i++) {
             if (il->channel_info[i].channel == channel)
                 return &il->channel_info[i];
         }
         break;
     case NL80211_BAND_2GHZ:
         if (channel >= 1 && channel <= 14)
             return &il->channel_info[channel - 1];
         break;
     default:
         BUG();
     }
 
     return NULL;
 }
 EXPORT_SYMBOL(il_get_channel_info);
 
 /*
  * Setting power level allows the card to go to sleep when not busy.
  *
  * We calculate a sleep command based on the required latency, which
  * we get from mac80211.
  */
 
 #define SLP_VEC(X0, X1, X2, X3, X4) { \
         cpu_to_le32(X0), \
         cpu_to_le32(X1), \
         cpu_to_le32(X2), \
         cpu_to_le32(X3), \
         cpu_to_le32(X4)  \
 }
 
 static void
 il_build_powertable_cmd(struct il_priv *il, struct il_powertable_cmd *cmd)
 {
     static const __le32 interval[3][IL_POWER_VEC_SIZE] = {
         SLP_VEC(2, 2, 4, 6, 0xFF),
         SLP_VEC(2, 4, 7, 10, 10),
         SLP_VEC(4, 7, 10, 10, 0xFF)
     };
     int i, dtim_period, no_dtim;
     u32 max_sleep;
     bool skip;
 
     memset(cmd, 0, sizeof(*cmd));
 
     if (il->power_data.pci_pm)
         cmd->flags |= IL_POWER_PCI_PM_MSK;
 
     /* if no Power Save, we are done */
     if (il->power_data.ps_disabled)
         return;
 
     cmd->flags = IL_POWER_DRIVER_ALLOW_SLEEP_MSK;
     cmd->keep_alive_seconds = 0;
     cmd->debug_flags = 0;
     cmd->rx_data_timeout = cpu_to_le32(25 * 1024);
     cmd->tx_data_timeout = cpu_to_le32(25 * 1024);
     cmd->keep_alive_beacons = 0;
 
     dtim_period = il->vif ? il->vif->bss_conf.dtim_period : 0;
 
     if (dtim_period <= 2) {
         memcpy(cmd->sleep_interval, interval[0], sizeof(interval[0]));
         no_dtim = 2;
     } else if (dtim_period <= 10) {
         memcpy(cmd->sleep_interval, interval[1], sizeof(interval[1]));
         no_dtim = 2;
     } else {
         memcpy(cmd->sleep_interval, interval[2], sizeof(interval[2]));
         no_dtim = 0;
     }
 
     if (dtim_period == 0) {
         dtim_period = 1;
         skip = false;
     } else {
         skip = !!no_dtim;
     }
 
     if (skip) {
         __le32 tmp = cmd->sleep_interval[IL_POWER_VEC_SIZE - 1];
 
         max_sleep = le32_to_cpu(tmp);
         if (max_sleep == 0xFF)
             max_sleep = dtim_period * (skip + 1);
         else if (max_sleep >  dtim_period)
             max_sleep = (max_sleep / dtim_period) * dtim_period;
         cmd->flags |= IL_POWER_SLEEP_OVER_DTIM_MSK;
     } else {
         max_sleep = dtim_period;
         cmd->flags &= ~IL_POWER_SLEEP_OVER_DTIM_MSK;
     }
 
     for (i = 0; i < IL_POWER_VEC_SIZE; i++)
         if (le32_to_cpu(cmd->sleep_interval[i]) > max_sleep)
             cmd->sleep_interval[i] = cpu_to_le32(max_sleep);
 }
 
 static int
 il_set_power(struct il_priv *il, struct il_powertable_cmd *cmd)
 {
     D_POWER("Sending power/sleep command\n");
     D_POWER("Flags value = 0x%08X\n", cmd->flags);
     D_POWER("Tx timeout = %u\n", le32_to_cpu(cmd->tx_data_timeout));
     D_POWER("Rx timeout = %u\n", le32_to_cpu(cmd->rx_data_timeout));
     D_POWER("Sleep interval vector = { %d , %d , %d , %d , %d }\n",
         le32_to_cpu(cmd->sleep_interval[0]),
         le32_to_cpu(cmd->sleep_interval[1]),
         le32_to_cpu(cmd->sleep_interval[2]),
         le32_to_cpu(cmd->sleep_interval[3]),
         le32_to_cpu(cmd->sleep_interval[4]));
 
     return il_send_cmd_pdu(il, C_POWER_TBL,
                    sizeof(struct il_powertable_cmd), cmd);
 }
 
 static int
 il_power_set_mode(struct il_priv *il, struct il_powertable_cmd *cmd, bool force)
 {
     int ret;
     bool update_chains;
 
     lockdep_assert_held(&il->mutex);
 
     /* Don't update the RX chain when chain noise calibration is running */
     update_chains = il->chain_noise_data.state == IL_CHAIN_NOISE_DONE ||
         il->chain_noise_data.state == IL_CHAIN_NOISE_ALIVE;
 
     if (!memcmp(&il->power_data.sleep_cmd, cmd, sizeof(*cmd)) && !force)
         return 0;
 
     if (!il_is_ready_rf(il))
         return -EIO;
 
     /* scan complete use sleep_power_next, need to be updated */
     memcpy(&il->power_data.sleep_cmd_next, cmd, sizeof(*cmd));
     if (test_bit(S_SCANNING, &il->status) && !force) {
         D_INFO("Defer power set mode while scanning\n");
         return 0;
     }
 
     if (cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK)
         set_bit(S_POWER_PMI, &il->status);
 
     ret = il_set_power(il, cmd);
     if (!ret) {
         if (!(cmd->flags & IL_POWER_DRIVER_ALLOW_SLEEP_MSK))
             clear_bit(S_POWER_PMI, &il->status);
 
         if (il->ops->update_chain_flags && update_chains)
             il->ops->update_chain_flags(il);
         else if (il->ops->update_chain_flags)
             D_POWER("Cannot update the power, chain noise "
                 "calibration running: %d\n",
                 il->chain_noise_data.state);
 
         memcpy(&il->power_data.sleep_cmd, cmd, sizeof(*cmd));
     } else
         IL_ERR("set power fail, ret = %d", ret);
 
     return ret;
 }
 
 int
 il_power_update_mode(struct il_priv *il, bool force)
 {
     struct il_powertable_cmd cmd;
 
     il_build_powertable_cmd(il, &cmd);
 
     return il_power_set_mode(il, &cmd, force);
 }
 EXPORT_SYMBOL(il_power_update_mode);
 
 /* initialize to default */
 void
 il_power_initialize(struct il_priv *il)
 {
     u16 lctl;
 
     pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl);
     il->power_data.pci_pm = !(lctl & PCI_EXP_LNKCTL_ASPM_L0S);
 
     il->power_data.debug_sleep_level_override = -1;
 
     memset(&il->power_data.sleep_cmd, 0, sizeof(il->power_data.sleep_cmd));
 }
 EXPORT_SYMBOL(il_power_initialize);
 
 /* For active scan, listen ACTIVE_DWELL_TIME (msec) on each channel after
  * sending probe req.  This should be set long enough to hear probe responses
  * from more than one AP.  */
 #define IL_ACTIVE_DWELL_TIME_24    (30) /* all times in msec */
 #define IL_ACTIVE_DWELL_TIME_52    (20)
 
 #define IL_ACTIVE_DWELL_FACTOR_24GHZ (3)
 #define IL_ACTIVE_DWELL_FACTOR_52GHZ (2)
 
 /* For passive scan, listen PASSIVE_DWELL_TIME (msec) on each channel.
  * Must be set longer than active dwell time.
  * For the most reliable scan, set > AP beacon interval (typically 100msec). */
 #define IL_PASSIVE_DWELL_TIME_24   (20) /* all times in msec */
 #define IL_PASSIVE_DWELL_TIME_52   (10)
 #define IL_PASSIVE_DWELL_BASE      (100)
 #define IL_CHANNEL_TUNE_TIME       5
 
 static int
 il_send_scan_abort(struct il_priv *il)
 {
     int ret;
     struct il_rx_pkt *pkt;
     struct il_host_cmd cmd = {
         .id = C_SCAN_ABORT,
         .flags = CMD_WANT_SKB,
     };
 
     /* Exit instantly with error when device is not ready
      * to receive scan abort command or it does not perform
      * hardware scan currently */
     if (!test_bit(S_READY, &il->status) ||
         !test_bit(S_GEO_CONFIGURED, &il->status) ||
         !test_bit(S_SCAN_HW, &il->status) ||
         test_bit(S_FW_ERROR, &il->status) ||
         test_bit(S_EXIT_PENDING, &il->status))
         return -EIO;
 
     ret = il_send_cmd_sync(il, &cmd);
     if (ret)
         return ret;
 
     pkt = (struct il_rx_pkt *)cmd.reply_page;
     if (pkt->u.status != CAN_ABORT_STATUS) {
         /* The scan abort will return 1 for success or
          * 2 for "failure".  A failure condition can be
          * due to simply not being in an active scan which
          * can occur if we send the scan abort before we
          * the microcode has notified us that a scan is
          * completed. */
         D_SCAN("SCAN_ABORT ret %d.\n", pkt->u.status);
         ret = -EIO;
     }
 
     il_free_pages(il, cmd.reply_page);
     return ret;
 }
 
 static void
 il_complete_scan(struct il_priv *il, bool aborted)
 {
     struct cfg80211_scan_info info = {
         .aborted = aborted,
     };
 
     /* check if scan was requested from mac80211 */
     if (il->scan_request) {
         D_SCAN("Complete scan in mac80211\n");
         ieee80211_scan_completed(il->hw, &info);
     }
 
     il->scan_vif = NULL;
     il->scan_request = NULL;
 }
 
 void
 il_force_scan_end(struct il_priv *il)
 {
     lockdep_assert_held(&il->mutex);
 
     if (!test_bit(S_SCANNING, &il->status)) {
         D_SCAN("Forcing scan end while not scanning\n");
         return;
     }
 
     D_SCAN("Forcing scan end\n");
     clear_bit(S_SCANNING, &il->status);
     clear_bit(S_SCAN_HW, &il->status);
     clear_bit(S_SCAN_ABORTING, &il->status);
     il_complete_scan(il, true);
 }
 
 static void
 il_do_scan_abort(struct il_priv *il)
 {
     int ret;
 
     lockdep_assert_held(&il->mutex);
 
     if (!test_bit(S_SCANNING, &il->status)) {
         D_SCAN("Not performing scan to abort\n");
         return;
     }
 
     if (test_and_set_bit(S_SCAN_ABORTING, &il->status)) {
         D_SCAN("Scan abort in progress\n");
         return;
     }
 
     ret = il_send_scan_abort(il);
     if (ret) {
         D_SCAN("Send scan abort failed %d\n", ret);
         il_force_scan_end(il);
     } else
         D_SCAN("Successfully send scan abort\n");
 }
 
 /*
  * il_scan_cancel - Cancel any currently executing HW scan
  */
 int
 il_scan_cancel(struct il_priv *il)
 {
     D_SCAN("Queuing abort scan\n");
     queue_work(il->workqueue, &il->abort_scan);
     return 0;
 }
 EXPORT_SYMBOL(il_scan_cancel);
 
 /*
  * il_scan_cancel_timeout - Cancel any currently executing HW scan
  * @ms: amount of time to wait (in milliseconds) for scan to abort
  *
  */
 int
 il_scan_cancel_timeout(struct il_priv *il, unsigned long ms)
 {
     unsigned long timeout = jiffies + msecs_to_jiffies(ms);
 
     lockdep_assert_held(&il->mutex);
 
     D_SCAN("Scan cancel timeout\n");
 
     il_do_scan_abort(il);
 
     while (time_before_eq(jiffies, timeout)) {
         if (!test_bit(S_SCAN_HW, &il->status))
             break;
         msleep(20);
     }
 
     return test_bit(S_SCAN_HW, &il->status);
 }
 EXPORT_SYMBOL(il_scan_cancel_timeout);
 
 /* Service response to C_SCAN (0x80) */
 static void
 il_hdl_scan(struct il_priv *il, struct il_rx_buf *rxb)
 {
 #ifdef CONFIG_IWLEGACY_DEBUG
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_scanreq_notification *notif =
         (struct il_scanreq_notification *)pkt->u.raw;
 
     D_SCAN("Scan request status = 0x%x\n", notif->status);
 #endif
 }
 
 /* Service N_SCAN_START (0x82) */
 static void
 il_hdl_scan_start(struct il_priv *il, struct il_rx_buf *rxb)
 {
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_scanstart_notification *notif =
         (struct il_scanstart_notification *)pkt->u.raw;
     il->scan_start_tsf = le32_to_cpu(notif->tsf_low);
     D_SCAN("Scan start: " "%d [802.11%s] "
            "(TSF: 0x%08X:%08X) - %d (beacon timer %u)\n", notif->channel,
            notif->band ? "bg" : "a", le32_to_cpu(notif->tsf_high),
            le32_to_cpu(notif->tsf_low), notif->status, notif->beacon_timer);
 }
 
 /* Service N_SCAN_RESULTS (0x83) */
 static void
 il_hdl_scan_results(struct il_priv *il, struct il_rx_buf *rxb)
 {
 #ifdef CONFIG_IWLEGACY_DEBUG
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_scanresults_notification *notif =
         (struct il_scanresults_notification *)pkt->u.raw;
 
     D_SCAN("Scan ch.res: " "%d [802.11%s] " "(TSF: 0x%08X:%08X) - %d "
            "elapsed=%lu usec\n", notif->channel, notif->band ? "bg" : "a",
            le32_to_cpu(notif->tsf_high), le32_to_cpu(notif->tsf_low),
            le32_to_cpu(notif->stats[0]),
            le32_to_cpu(notif->tsf_low) - il->scan_start_tsf);
 #endif
 }
 
 /* Service N_SCAN_COMPLETE (0x84) */
 static void
 il_hdl_scan_complete(struct il_priv *il, struct il_rx_buf *rxb)
 {
 
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_scancomplete_notification *scan_notif = (void *)pkt->u.raw;
 
     D_SCAN("Scan complete: %d channels (TSF 0x%08X:%08X) - %d\n",
            scan_notif->scanned_channels, scan_notif->tsf_low,
            scan_notif->tsf_high, scan_notif->status);
 
     /* The HW is no longer scanning */
     clear_bit(S_SCAN_HW, &il->status);
 
     D_SCAN("Scan on %sGHz took %dms\n",
            (il->scan_band == NL80211_BAND_2GHZ) ? "2.4" : "5.2",
            jiffies_to_msecs(jiffies - il->scan_start));
 
     queue_work(il->workqueue, &il->scan_completed);
 }
 
 void
 il_setup_rx_scan_handlers(struct il_priv *il)
 {
     /* scan handlers */
     il->handlers[C_SCAN] = il_hdl_scan;
     il->handlers[N_SCAN_START] = il_hdl_scan_start;
     il->handlers[N_SCAN_RESULTS] = il_hdl_scan_results;
     il->handlers[N_SCAN_COMPLETE] = il_hdl_scan_complete;
 }
 EXPORT_SYMBOL(il_setup_rx_scan_handlers);
 
 u16
 il_get_active_dwell_time(struct il_priv *il, enum nl80211_band band,
              u8 n_probes)
 {
     if (band == NL80211_BAND_5GHZ)
         return IL_ACTIVE_DWELL_TIME_52 +
             IL_ACTIVE_DWELL_FACTOR_52GHZ * (n_probes + 1);
     else
         return IL_ACTIVE_DWELL_TIME_24 +
             IL_ACTIVE_DWELL_FACTOR_24GHZ * (n_probes + 1);
 }
 EXPORT_SYMBOL(il_get_active_dwell_time);
 
 u16
 il_get_passive_dwell_time(struct il_priv *il, enum nl80211_band band,
               struct ieee80211_vif *vif)
 {
     u16 value;
 
     u16 passive =
         (band ==
          NL80211_BAND_2GHZ) ? IL_PASSIVE_DWELL_BASE +
         IL_PASSIVE_DWELL_TIME_24 : IL_PASSIVE_DWELL_BASE +
         IL_PASSIVE_DWELL_TIME_52;
 
     if (il_is_any_associated(il)) {
         /*
          * If we're associated, we clamp the maximum passive
          * dwell time to be 98% of the smallest beacon interval
          * (minus 2 * channel tune time)
          */
         value = il->vif ? il->vif->bss_conf.beacon_int : 0;
         if (value > IL_PASSIVE_DWELL_BASE || !value)
             value = IL_PASSIVE_DWELL_BASE;
         value = (value * 98) / 100 - IL_CHANNEL_TUNE_TIME * 2;
         passive = min(value, passive);
     }
 
     return passive;
 }
 EXPORT_SYMBOL(il_get_passive_dwell_time);
 
 void
 il_init_scan_params(struct il_priv *il)
 {
     u8 ant_idx = fls(il->hw_params.valid_tx_ant) - 1;
     if (!il->scan_tx_ant[NL80211_BAND_5GHZ])
         il->scan_tx_ant[NL80211_BAND_5GHZ] = ant_idx;
     if (!il->scan_tx_ant[NL80211_BAND_2GHZ])
         il->scan_tx_ant[NL80211_BAND_2GHZ] = ant_idx;
 }
 EXPORT_SYMBOL(il_init_scan_params);
 
 static int
 il_scan_initiate(struct il_priv *il, struct ieee80211_vif *vif)
 {
     int ret;
 
     lockdep_assert_held(&il->mutex);
 
     cancel_delayed_work(&il->scan_check);
 
     if (!il_is_ready_rf(il)) {
         IL_WARN("Request scan called when driver not ready.\n");
         return -EIO;
     }
 
     if (test_bit(S_SCAN_HW, &il->status)) {
         D_SCAN("Multiple concurrent scan requests in parallel.\n");
         return -EBUSY;
     }
 
     if (test_bit(S_SCAN_ABORTING, &il->status)) {
         D_SCAN("Scan request while abort pending.\n");
         return -EBUSY;
     }
 
     D_SCAN("Starting scan...\n");
 
     set_bit(S_SCANNING, &il->status);
     il->scan_start = jiffies;
 
     ret = il->ops->request_scan(il, vif);
     if (ret) {
         clear_bit(S_SCANNING, &il->status);
         return ret;
     }
 
     queue_delayed_work(il->workqueue, &il->scan_check,
                IL_SCAN_CHECK_WATCHDOG);
 
     return 0;
 }
 
 int
 il_mac_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
            struct ieee80211_scan_request *hw_req)
 {
     struct cfg80211_scan_request *req = &hw_req->req;
     struct il_priv *il = hw->priv;
     int ret;
 
     if (req->n_channels == 0) {
         IL_ERR("Can not scan on no channels.\n");
         return -EINVAL;
     }
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter\n");
 
     if (test_bit(S_SCANNING, &il->status)) {
         D_SCAN("Scan already in progress.\n");
         ret = -EAGAIN;
         goto out_unlock;
     }
 
     /* mac80211 will only ask for one band at a time */
     il->scan_request = req;
     il->scan_vif = vif;
     il->scan_band = req->channels[0]->band;
 
     ret = il_scan_initiate(il, vif);
 
 out_unlock:
     D_MAC80211("leave ret %d\n", ret);
     mutex_unlock(&il->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL(il_mac_hw_scan);
 
 static void
 il_bg_scan_check(struct work_struct *data)
 {
     struct il_priv *il =
         container_of(data, struct il_priv, scan_check.work);
 
     D_SCAN("Scan check work\n");
 
     /* Since we are here firmware does not finish scan and
      * most likely is in bad shape, so we don't bother to
      * send abort command, just force scan complete to mac80211 */
     mutex_lock(&il->mutex);
     il_force_scan_end(il);
     mutex_unlock(&il->mutex);
 }
 
 /*
  * il_fill_probe_req - fill in all required fields and IE for probe request
  */
 u16
 il_fill_probe_req(struct il_priv *il, struct ieee80211_mgmt *frame,
           const u8 *ta, const u8 *ies, int ie_len, int left)
 {
     int len = 0;
     u8 *pos = NULL;
 
     /* Make sure there is enough space for the probe request,
      * two mandatory IEs and the data */
     left -= 24;
     if (left < 0)
         return 0;
 
     frame->frame_control = cpu_to_le16(IEEE80211_STYPE_PROBE_REQ);
     eth_broadcast_addr(frame->da);
     memcpy(frame->sa, ta, ETH_ALEN);
     eth_broadcast_addr(frame->bssid);
     frame->seq_ctrl = 0;
 
     len += 24;
 
     /* ...next IE... */
     pos = &frame->u.probe_req.variable[0];
 
     /* fill in our indirect SSID IE */
     left -= 2;
     if (left < 0)
         return 0;
     *pos++ = WLAN_EID_SSID;
     *pos++ = 0;
 
     len += 2;
 
     if (WARN_ON(left < ie_len))
         return len;
 
     if (ies && ie_len) {
         memcpy(pos, ies, ie_len);
         len += ie_len;
     }
 
     return (u16) len;
 }
 EXPORT_SYMBOL(il_fill_probe_req);
 
 static void
 il_bg_abort_scan(struct work_struct *work)
 {
     struct il_priv *il = container_of(work, struct il_priv, abort_scan);
 
     D_SCAN("Abort scan work\n");
 
     /* We keep scan_check work queued in case when firmware will not
      * report back scan completed notification */
     mutex_lock(&il->mutex);
     il_scan_cancel_timeout(il, 200);
     mutex_unlock(&il->mutex);
 }
 
 static void
 il_bg_scan_completed(struct work_struct *work)
 {
     struct il_priv *il = container_of(work, struct il_priv, scan_completed);
     bool aborted;
 
     D_SCAN("Completed scan.\n");
 
     cancel_delayed_work(&il->scan_check);
 
     mutex_lock(&il->mutex);
 
     aborted = test_and_clear_bit(S_SCAN_ABORTING, &il->status);
     if (aborted)
         D_SCAN("Aborted scan completed.\n");
 
     if (!test_and_clear_bit(S_SCANNING, &il->status)) {
         D_SCAN("Scan already completed.\n");
         goto out_settings;
     }
 
     il_complete_scan(il, aborted);
 
 out_settings:
     /* Can we still talk to firmware ? */
     if (!il_is_ready_rf(il))
         goto out;
 
     /*
      * We do not commit power settings while scan is pending,
      * do it now if the settings changed.
      */
     il_power_set_mode(il, &il->power_data.sleep_cmd_next, false);
     il_set_tx_power(il, il->tx_power_next, false);
 
     il->ops->post_scan(il);
 
 out:
     mutex_unlock(&il->mutex);
 }
 
 void
 il_setup_scan_deferred_work(struct il_priv *il)
 {
     INIT_WORK(&il->scan_completed, il_bg_scan_completed);
     INIT_WORK(&il->abort_scan, il_bg_abort_scan);
     INIT_DELAYED_WORK(&il->scan_check, il_bg_scan_check);
 }
 EXPORT_SYMBOL(il_setup_scan_deferred_work);
 
 void
 il_cancel_scan_deferred_work(struct il_priv *il)
 {
     cancel_work_sync(&il->abort_scan);
     cancel_work_sync(&il->scan_completed);
 
     if (cancel_delayed_work_sync(&il->scan_check)) {
         mutex_lock(&il->mutex);
         il_force_scan_end(il);
         mutex_unlock(&il->mutex);
     }
 }
 EXPORT_SYMBOL(il_cancel_scan_deferred_work);
 
 /* il->sta_lock must be held */
 static void
 il_sta_ucode_activate(struct il_priv *il, u8 sta_id)
 {
 
     if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE))
         IL_ERR("ACTIVATE a non DRIVER active station id %u addr %pM\n",
                sta_id, il->stations[sta_id].sta.sta.addr);
 
     if (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) {
         D_ASSOC("STA id %u addr %pM already present"
             " in uCode (according to driver)\n", sta_id,
             il->stations[sta_id].sta.sta.addr);
     } else {
         il->stations[sta_id].used |= IL_STA_UCODE_ACTIVE;
         D_ASSOC("Added STA id %u addr %pM to uCode\n", sta_id,
             il->stations[sta_id].sta.sta.addr);
     }
 }
 
 static int
 il_process_add_sta_resp(struct il_priv *il, struct il_addsta_cmd *addsta,
             struct il_rx_pkt *pkt, bool sync)
 {
     u8 sta_id = addsta->sta.sta_id;
     unsigned long flags;
     int ret = -EIO;
 
     if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
         IL_ERR("Bad return from C_ADD_STA (0x%08X)\n", pkt->hdr.flags);
         return ret;
     }
 
     D_INFO("Processing response for adding station %u\n", sta_id);
 
     spin_lock_irqsave(&il->sta_lock, flags);
 
     switch (pkt->u.add_sta.status) {
     case ADD_STA_SUCCESS_MSK:
         D_INFO("C_ADD_STA PASSED\n");
         il_sta_ucode_activate(il, sta_id);
         ret = 0;
         break;
     case ADD_STA_NO_ROOM_IN_TBL:
         IL_ERR("Adding station %d failed, no room in table.\n", sta_id);
         break;
     case ADD_STA_NO_BLOCK_ACK_RESOURCE:
         IL_ERR("Adding station %d failed, no block ack resource.\n",
                sta_id);
         break;
     case ADD_STA_MODIFY_NON_EXIST_STA:
         IL_ERR("Attempting to modify non-existing station %d\n",
                sta_id);
         break;
     default:
         D_ASSOC("Received C_ADD_STA:(0x%08X)\n", pkt->u.add_sta.status);
         break;
     }
 
     D_INFO("%s station id %u addr %pM\n",
            il->stations[sta_id].sta.mode ==
            STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", sta_id,
            il->stations[sta_id].sta.sta.addr);
 
     /*
      * XXX: The MAC address in the command buffer is often changed from
      * the original sent to the device. That is, the MAC address
      * written to the command buffer often is not the same MAC address
      * read from the command buffer when the command returns. This
      * issue has not yet been resolved and this debugging is left to
      * observe the problem.
      */
     D_INFO("%s station according to cmd buffer %pM\n",
            il->stations[sta_id].sta.mode ==
            STA_CONTROL_MODIFY_MSK ? "Modified" : "Added", addsta->sta.addr);
     spin_unlock_irqrestore(&il->sta_lock, flags);
 
     return ret;
 }
 
 static void
 il_add_sta_callback(struct il_priv *il, struct il_device_cmd *cmd,
             struct il_rx_pkt *pkt)
 {
     struct il_addsta_cmd *addsta = (struct il_addsta_cmd *)cmd->cmd.payload;
 
     il_process_add_sta_resp(il, addsta, pkt, false);
 
 }
 
 int
 il_send_add_sta(struct il_priv *il, struct il_addsta_cmd *sta, u8 flags)
 {
     struct il_rx_pkt *pkt = NULL;
     int ret = 0;
     u8 data[sizeof(*sta)];
     struct il_host_cmd cmd = {
         .id = C_ADD_STA,
         .flags = flags,
         .data = data,
     };
     u8 sta_id __maybe_unused = sta->sta.sta_id;
 
     D_INFO("Adding sta %u (%pM) %ssynchronously\n", sta_id, sta->sta.addr,
            flags & CMD_ASYNC ? "a" : "");
 
     if (flags & CMD_ASYNC)
         cmd.callback = il_add_sta_callback;
     else {
         cmd.flags |= CMD_WANT_SKB;
         might_sleep();
     }
 
     cmd.len = il->ops->build_addsta_hcmd(sta, data);
     ret = il_send_cmd(il, &cmd);
     if (ret)
         return ret;
     if (flags & CMD_ASYNC)
         return 0;
 
     pkt = (struct il_rx_pkt *)cmd.reply_page;
     ret = il_process_add_sta_resp(il, sta, pkt, true);
 
     il_free_pages(il, cmd.reply_page);
 
     return ret;
 }
 EXPORT_SYMBOL(il_send_add_sta);
 
 static void
 il_set_ht_add_station(struct il_priv *il, u8 idx, struct ieee80211_sta *sta)
 {
     struct ieee80211_sta_ht_cap *sta_ht_inf = &sta->deflink.ht_cap;
     __le32 sta_flags;
 
     if (!sta || !sta_ht_inf->ht_supported)
         goto done;
 
     D_ASSOC("spatial multiplexing power save mode: %s\n",
         (sta->smps_mode == IEEE80211_SMPS_STATIC) ? "static" :
         (sta->smps_mode == IEEE80211_SMPS_DYNAMIC) ? "dynamic" :
         "disabled");
 
     sta_flags = il->stations[idx].sta.station_flags;
 
     sta_flags &= ~(STA_FLG_RTS_MIMO_PROT_MSK | STA_FLG_MIMO_DIS_MSK);
 
     switch (sta->smps_mode) {
     case IEEE80211_SMPS_STATIC:
         sta_flags |= STA_FLG_MIMO_DIS_MSK;
         break;
     case IEEE80211_SMPS_DYNAMIC:
         sta_flags |= STA_FLG_RTS_MIMO_PROT_MSK;
         break;
     case IEEE80211_SMPS_OFF:
         break;
     default:
         IL_WARN("Invalid MIMO PS mode %d\n", sta->smps_mode);
         break;
     }
 
     sta_flags |=
         cpu_to_le32((u32) sta_ht_inf->
             ampdu_factor << STA_FLG_MAX_AGG_SIZE_POS);
 
     sta_flags |=
         cpu_to_le32((u32) sta_ht_inf->
             ampdu_density << STA_FLG_AGG_MPDU_DENSITY_POS);
 
     if (il_is_ht40_tx_allowed(il, &sta->deflink.ht_cap))
         sta_flags |= STA_FLG_HT40_EN_MSK;
     else
         sta_flags &= ~STA_FLG_HT40_EN_MSK;
 
     il->stations[idx].sta.station_flags = sta_flags;
 done:
     return;
 }
 
 /*
  * il_prep_station - Prepare station information for addition
  *
  * should be called with sta_lock held
  */
 u8
 il_prep_station(struct il_priv *il, const u8 *addr, bool is_ap,
         struct ieee80211_sta *sta)
 {
     struct il_station_entry *station;
     int i;
     u8 sta_id = IL_INVALID_STATION;
     u16 rate;
 
     if (is_ap)
         sta_id = IL_AP_ID;
     else if (is_broadcast_ether_addr(addr))
         sta_id = il->hw_params.bcast_id;
     else
         for (i = IL_STA_ID; i < il->hw_params.max_stations; i++) {
             if (ether_addr_equal(il->stations[i].sta.sta.addr,
                          addr)) {
                 sta_id = i;
                 break;
             }
 
             if (!il->stations[i].used &&
                 sta_id == IL_INVALID_STATION)
                 sta_id = i;
         }
 
     /*
      * These two conditions have the same outcome, but keep them
      * separate
      */
     if (unlikely(sta_id == IL_INVALID_STATION))
         return sta_id;
 
     /*
      * uCode is not able to deal with multiple requests to add a
      * station. Keep track if one is in progress so that we do not send
      * another.
      */
     if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
         D_INFO("STA %d already in process of being added.\n", sta_id);
         return sta_id;
     }
 
     if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
         (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE) &&
         ether_addr_equal(il->stations[sta_id].sta.sta.addr, addr)) {
         D_ASSOC("STA %d (%pM) already added, not adding again.\n",
             sta_id, addr);
         return sta_id;
     }
 
     station = &il->stations[sta_id];
     station->used = IL_STA_DRIVER_ACTIVE;
     D_ASSOC("Add STA to driver ID %d: %pM\n", sta_id, addr);
     il->num_stations++;
 
     /* Set up the C_ADD_STA command to send to device */
     memset(&station->sta, 0, sizeof(struct il_addsta_cmd));
     memcpy(station->sta.sta.addr, addr, ETH_ALEN);
     station->sta.mode = 0;
     station->sta.sta.sta_id = sta_id;
     station->sta.station_flags = 0;
 
     /*
      * OK to call unconditionally, since local stations (IBSS BSSID
      * STA and broadcast STA) pass in a NULL sta, and mac80211
      * doesn't allow HT IBSS.
      */
     il_set_ht_add_station(il, sta_id, sta);
 
     /* 3945 only */
     rate = (il->band == NL80211_BAND_5GHZ) ? RATE_6M_PLCP : RATE_1M_PLCP;
     /* Turn on both antennas for the station... */
     station->sta.rate_n_flags = cpu_to_le16(rate | RATE_MCS_ANT_AB_MSK);
 
     return sta_id;
 
 }
 EXPORT_SYMBOL_GPL(il_prep_station);
 
 #define STA_WAIT_TIMEOUT (HZ/2)
 
 /*
  * il_add_station_common -
  */
 int
 il_add_station_common(struct il_priv *il, const u8 *addr, bool is_ap,
               struct ieee80211_sta *sta, u8 *sta_id_r)
 {
     unsigned long flags_spin;
     int ret = 0;
     u8 sta_id;
     struct il_addsta_cmd sta_cmd;
 
     *sta_id_r = 0;
     spin_lock_irqsave(&il->sta_lock, flags_spin);
     sta_id = il_prep_station(il, addr, is_ap, sta);
     if (sta_id == IL_INVALID_STATION) {
         IL_ERR("Unable to prepare station %pM for addition\n", addr);
         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
         return -EINVAL;
     }
 
     /*
      * uCode is not able to deal with multiple requests to add a
      * station. Keep track if one is in progress so that we do not send
      * another.
      */
     if (il->stations[sta_id].used & IL_STA_UCODE_INPROGRESS) {
         D_INFO("STA %d already in process of being added.\n", sta_id);
         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
         return -EEXIST;
     }
 
     if ((il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE) &&
         (il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
         D_ASSOC("STA %d (%pM) already added, not adding again.\n",
             sta_id, addr);
         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
         return -EEXIST;
     }
 
     il->stations[sta_id].used |= IL_STA_UCODE_INPROGRESS;
     memcpy(&sta_cmd, &il->stations[sta_id].sta,
            sizeof(struct il_addsta_cmd));
     spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 
     /* Add station to device's station table */
     ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
     if (ret) {
         spin_lock_irqsave(&il->sta_lock, flags_spin);
         IL_ERR("Adding station %pM failed.\n",
                il->stations[sta_id].sta.sta.addr);
         il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
         il->stations[sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
     }
     *sta_id_r = sta_id;
     return ret;
 }
 EXPORT_SYMBOL(il_add_station_common);
 
 /*
  * il_sta_ucode_deactivate - deactivate ucode status for a station
  *
  * il->sta_lock must be held
  */
 static void
 il_sta_ucode_deactivate(struct il_priv *il, u8 sta_id)
 {
     /* Ucode must be active and driver must be non active */
     if ((il->stations[sta_id].
          used & (IL_STA_UCODE_ACTIVE | IL_STA_DRIVER_ACTIVE)) !=
         IL_STA_UCODE_ACTIVE)
         IL_ERR("removed non active STA %u\n", sta_id);
 
     il->stations[sta_id].used &= ~IL_STA_UCODE_ACTIVE;
 
     memset(&il->stations[sta_id], 0, sizeof(struct il_station_entry));
     D_ASSOC("Removed STA %u\n", sta_id);
 }
 
 static int
 il_send_remove_station(struct il_priv *il, const u8 * addr, int sta_id,
                bool temporary)
 {
     struct il_rx_pkt *pkt;
     int ret;
 
     unsigned long flags_spin;
     struct il_rem_sta_cmd rm_sta_cmd;
 
     struct il_host_cmd cmd = {
         .id = C_REM_STA,
         .len = sizeof(struct il_rem_sta_cmd),
         .flags = CMD_SYNC,
         .data = &rm_sta_cmd,
     };
 
     memset(&rm_sta_cmd, 0, sizeof(rm_sta_cmd));
     rm_sta_cmd.num_sta = 1;
     memcpy(&rm_sta_cmd.addr, addr, ETH_ALEN);
 
     cmd.flags |= CMD_WANT_SKB;
 
     ret = il_send_cmd(il, &cmd);
 
     if (ret)
         return ret;
 
     pkt = (struct il_rx_pkt *)cmd.reply_page;
     if (pkt->hdr.flags & IL_CMD_FAILED_MSK) {
         IL_ERR("Bad return from C_REM_STA (0x%08X)\n", pkt->hdr.flags);
         ret = -EIO;
     }
 
     if (!ret) {
         switch (pkt->u.rem_sta.status) {
         case REM_STA_SUCCESS_MSK:
             if (!temporary) {
                 spin_lock_irqsave(&il->sta_lock, flags_spin);
                 il_sta_ucode_deactivate(il, sta_id);
                 spin_unlock_irqrestore(&il->sta_lock,
                                flags_spin);
             }
             D_ASSOC("C_REM_STA PASSED\n");
             break;
         default:
             ret = -EIO;
             IL_ERR("C_REM_STA failed\n");
             break;
         }
     }
     il_free_pages(il, cmd.reply_page);
 
     return ret;
 }
 
 /*
  * il_remove_station - Remove driver's knowledge of station.
  */
 int
 il_remove_station(struct il_priv *il, const u8 sta_id, const u8 * addr)
 {
     unsigned long flags;
 
     if (!il_is_ready(il)) {
         D_INFO("Unable to remove station %pM, device not ready.\n",
                addr);
         /*
          * It is typical for stations to be removed when we are
          * going down. Return success since device will be down
          * soon anyway
          */
         return 0;
     }
 
     D_ASSOC("Removing STA from driver:%d  %pM\n", sta_id, addr);
 
     if (WARN_ON(sta_id == IL_INVALID_STATION))
         return -EINVAL;
 
     spin_lock_irqsave(&il->sta_lock, flags);
 
     if (!(il->stations[sta_id].used & IL_STA_DRIVER_ACTIVE)) {
         D_INFO("Removing %pM but non DRIVER active\n", addr);
         goto out_err;
     }
 
     if (!(il->stations[sta_id].used & IL_STA_UCODE_ACTIVE)) {
         D_INFO("Removing %pM but non UCODE active\n", addr);
         goto out_err;
     }
 
     if (il->stations[sta_id].used & IL_STA_LOCAL) {
         kfree(il->stations[sta_id].lq);
         il->stations[sta_id].lq = NULL;
     }
 
     il->stations[sta_id].used &= ~IL_STA_DRIVER_ACTIVE;
 
     il->num_stations--;
 
     BUG_ON(il->num_stations < 0);
 
     spin_unlock_irqrestore(&il->sta_lock, flags);
 
     return il_send_remove_station(il, addr, sta_id, false);
 out_err:
     spin_unlock_irqrestore(&il->sta_lock, flags);
     return -EINVAL;
 }
 EXPORT_SYMBOL_GPL(il_remove_station);
 
 /*
  * il_clear_ucode_stations - clear ucode station table bits
  *
  * This function clears all the bits in the driver indicating
  * which stations are active in the ucode. Call when something
  * other than explicit station management would cause this in
  * the ucode, e.g. unassociated RXON.
  */
 void
 il_clear_ucode_stations(struct il_priv *il)
 {
     int i;
     unsigned long flags_spin;
     bool cleared = false;
 
     D_INFO("Clearing ucode stations in driver\n");
 
     spin_lock_irqsave(&il->sta_lock, flags_spin);
     for (i = 0; i < il->hw_params.max_stations; i++) {
         if (il->stations[i].used & IL_STA_UCODE_ACTIVE) {
             D_INFO("Clearing ucode active for station %d\n", i);
             il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
             cleared = true;
         }
     }
     spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 
     if (!cleared)
         D_INFO("No active stations found to be cleared\n");
 }
 EXPORT_SYMBOL(il_clear_ucode_stations);
 
 /*
  * il_restore_stations() - Restore driver known stations to device
  *
  * All stations considered active by driver, but not present in ucode, is
  * restored.
  *
  * Function sleeps.
  */
 void
 il_restore_stations(struct il_priv *il)
 {
     struct il_addsta_cmd sta_cmd;
     struct il_link_quality_cmd lq;
     unsigned long flags_spin;
     int i;
     bool found = false;
     int ret;
     bool send_lq;
 
     if (!il_is_ready(il)) {
         D_INFO("Not ready yet, not restoring any stations.\n");
         return;
     }
 
     D_ASSOC("Restoring all known stations ... start.\n");
     spin_lock_irqsave(&il->sta_lock, flags_spin);
     for (i = 0; i < il->hw_params.max_stations; i++) {
         if ((il->stations[i].used & IL_STA_DRIVER_ACTIVE) &&
             !(il->stations[i].used & IL_STA_UCODE_ACTIVE)) {
             D_ASSOC("Restoring sta %pM\n",
                 il->stations[i].sta.sta.addr);
             il->stations[i].sta.mode = 0;
             il->stations[i].used |= IL_STA_UCODE_INPROGRESS;
             found = true;
         }
     }
 
     for (i = 0; i < il->hw_params.max_stations; i++) {
         if ((il->stations[i].used & IL_STA_UCODE_INPROGRESS)) {
             memcpy(&sta_cmd, &il->stations[i].sta,
                    sizeof(struct il_addsta_cmd));
             send_lq = false;
             if (il->stations[i].lq) {
                 memcpy(&lq, il->stations[i].lq,
                        sizeof(struct il_link_quality_cmd));
                 send_lq = true;
             }
             spin_unlock_irqrestore(&il->sta_lock, flags_spin);
             ret = il_send_add_sta(il, &sta_cmd, CMD_SYNC);
             if (ret) {
                 spin_lock_irqsave(&il->sta_lock, flags_spin);
                 IL_ERR("Adding station %pM failed.\n",
                        il->stations[i].sta.sta.addr);
                 il->stations[i].used &= ~IL_STA_DRIVER_ACTIVE;
                 il->stations[i].used &=
                     ~IL_STA_UCODE_INPROGRESS;
                 spin_unlock_irqrestore(&il->sta_lock,
                                flags_spin);
             }
             /*
              * Rate scaling has already been initialized, send
              * current LQ command
              */
             if (send_lq)
                 il_send_lq_cmd(il, &lq, CMD_SYNC, true);
             spin_lock_irqsave(&il->sta_lock, flags_spin);
             il->stations[i].used &= ~IL_STA_UCODE_INPROGRESS;
         }
     }
 
     spin_unlock_irqrestore(&il->sta_lock, flags_spin);
     if (!found)
         D_INFO("Restoring all known stations"
                " .... no stations to be restored.\n");
     else
         D_INFO("Restoring all known stations" " .... complete.\n");
 }
 EXPORT_SYMBOL(il_restore_stations);
 
 int
 il_get_free_ucode_key_idx(struct il_priv *il)
 {
     int i;
 
     for (i = 0; i < il->sta_key_max_num; i++)
         if (!test_and_set_bit(i, &il->ucode_key_table))
             return i;
 
     return WEP_INVALID_OFFSET;
 }
 EXPORT_SYMBOL(il_get_free_ucode_key_idx);
 
 void
 il_dealloc_bcast_stations(struct il_priv *il)
 {
     unsigned long flags;
     int i;
 
     spin_lock_irqsave(&il->sta_lock, flags);
     for (i = 0; i < il->hw_params.max_stations; i++) {
         if (!(il->stations[i].used & IL_STA_BCAST))
             continue;
 
         il->stations[i].used &= ~IL_STA_UCODE_ACTIVE;
         il->num_stations--;
         BUG_ON(il->num_stations < 0);
         kfree(il->stations[i].lq);
         il->stations[i].lq = NULL;
     }
     spin_unlock_irqrestore(&il->sta_lock, flags);
 }
 EXPORT_SYMBOL_GPL(il_dealloc_bcast_stations);
 
 #ifdef CONFIG_IWLEGACY_DEBUG
 static void
 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
 {
     int i;
     D_RATE("lq station id 0x%x\n", lq->sta_id);
     D_RATE("lq ant 0x%X 0x%X\n", lq->general_params.single_stream_ant_msk,
            lq->general_params.dual_stream_ant_msk);
 
     for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++)
         D_RATE("lq idx %d 0x%X\n", i, lq->rs_table[i].rate_n_flags);
 }
 #else
 static inline void
 il_dump_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq)
 {
 }
 #endif
 
 /*
  * il_is_lq_table_valid() - Test one aspect of LQ cmd for validity
  *
  * It sometimes happens when a HT rate has been in use and we
  * loose connectivity with AP then mac80211 will first tell us that the
  * current channel is not HT anymore before removing the station. In such a
  * scenario the RXON flags will be updated to indicate we are not
  * communicating HT anymore, but the LQ command may still contain HT rates.
  * Test for this to prevent driver from sending LQ command between the time
  * RXON flags are updated and when LQ command is updated.
  */
 static bool
 il_is_lq_table_valid(struct il_priv *il, struct il_link_quality_cmd *lq)
 {
     int i;
 
     if (il->ht.enabled)
         return true;
 
     D_INFO("Channel %u is not an HT channel\n", il->active.channel);
     for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
         if (le32_to_cpu(lq->rs_table[i].rate_n_flags) & RATE_MCS_HT_MSK) {
             D_INFO("idx %d of LQ expects HT channel\n", i);
             return false;
         }
     }
     return true;
 }
 
 /*
  * il_send_lq_cmd() - Send link quality command
  * @init: This command is sent as part of station initialization right
  *        after station has been added.
  *
  * The link quality command is sent as the last step of station creation.
  * This is the special case in which init is set and we call a callback in
  * this case to clear the state indicating that station creation is in
  * progress.
  */
 int
 il_send_lq_cmd(struct il_priv *il, struct il_link_quality_cmd *lq,
            u8 flags, bool init)
 {
     int ret = 0;
     unsigned long flags_spin;
 
     struct il_host_cmd cmd = {
         .id = C_TX_LINK_QUALITY_CMD,
         .len = sizeof(struct il_link_quality_cmd),
         .flags = flags,
         .data = lq,
     };
 
     if (WARN_ON(lq->sta_id == IL_INVALID_STATION))
         return -EINVAL;
 
     spin_lock_irqsave(&il->sta_lock, flags_spin);
     if (!(il->stations[lq->sta_id].used & IL_STA_DRIVER_ACTIVE)) {
         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
         return -EINVAL;
     }
     spin_unlock_irqrestore(&il->sta_lock, flags_spin);
 
     il_dump_lq_cmd(il, lq);
     BUG_ON(init && (cmd.flags & CMD_ASYNC));
 
     if (il_is_lq_table_valid(il, lq))
         ret = il_send_cmd(il, &cmd);
     else
         ret = -EINVAL;
 
     if (cmd.flags & CMD_ASYNC)
         return ret;
 
     if (init) {
         D_INFO("init LQ command complete,"
                " clearing sta addition status for sta %d\n",
                lq->sta_id);
         spin_lock_irqsave(&il->sta_lock, flags_spin);
         il->stations[lq->sta_id].used &= ~IL_STA_UCODE_INPROGRESS;
         spin_unlock_irqrestore(&il->sta_lock, flags_spin);
     }
     return ret;
 }
 EXPORT_SYMBOL(il_send_lq_cmd);
 
 int
 il_mac_sta_remove(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
           struct ieee80211_sta *sta)
 {
     struct il_priv *il = hw->priv;
     struct il_station_priv_common *sta_common = (void *)sta->drv_priv;
     int ret;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter station %pM\n", sta->addr);
 
     ret = il_remove_station(il, sta_common->sta_id, sta->addr);
     if (ret)
         IL_ERR("Error removing station %pM\n", sta->addr);
 
     D_MAC80211("leave ret %d\n", ret);
     mutex_unlock(&il->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL(il_mac_sta_remove);
 
 /************************** RX-FUNCTIONS ****************************/
 /*
  * Rx theory of operation
  *
  * Driver allocates a circular buffer of Receive Buffer Descriptors (RBDs),
  * each of which point to Receive Buffers to be filled by the NIC.  These get
  * used not only for Rx frames, but for any command response or notification
  * from the NIC.  The driver and NIC manage the Rx buffers by means
  * of idxes into the circular buffer.
  *
  * Rx Queue Indexes
  * The host/firmware share two idx registers for managing the Rx buffers.
  *
  * The READ idx maps to the first position that the firmware may be writing
  * to -- the driver can read up to (but not including) this position and get
  * good data.
  * The READ idx is managed by the firmware once the card is enabled.
  *
  * The WRITE idx maps to the last position the driver has read from -- the
  * position preceding WRITE is the last slot the firmware can place a packet.
  *
  * The queue is empty (no good data) if WRITE = READ - 1, and is full if
  * WRITE = READ.
  *
  * During initialization, the host sets up the READ queue position to the first
  * IDX position, and WRITE to the last (READ - 1 wrapped)
  *
  * When the firmware places a packet in a buffer, it will advance the READ idx
  * and fire the RX interrupt.  The driver can then query the READ idx and
  * process as many packets as possible, moving the WRITE idx forward as it
  * resets the Rx queue buffers with new memory.
  *
  * The management in the driver is as follows:
  * + A list of pre-allocated SKBs is stored in iwl->rxq->rx_free.  When
  *   iwl->rxq->free_count drops to or below RX_LOW_WATERMARK, work is scheduled
  *   to replenish the iwl->rxq->rx_free.
  * + In il_rx_replenish (scheduled) if 'processed' != 'read' then the
  *   iwl->rxq is replenished and the READ IDX is updated (updating the
  *   'processed' and 'read' driver idxes as well)
  * + A received packet is processed and handed to the kernel network stack,
  *   detached from the iwl->rxq.  The driver 'processed' idx is updated.
  * + The Host/Firmware iwl->rxq is replenished at tasklet time from the rx_free
  *   list. If there are no allocated buffers in iwl->rxq->rx_free, the READ
  *   IDX is not incremented and iwl->status(RX_STALLED) is set.  If there
  *   were enough free buffers and RX_STALLED is set it is cleared.
  *
  *
  * Driver sequence:
  *
  * il_rx_queue_alloc()   Allocates rx_free
  * il_rx_replenish()     Replenishes rx_free list from rx_used, and calls
  *                            il_rx_queue_restock
  * il_rx_queue_restock() Moves available buffers from rx_free into Rx
  *                            queue, updates firmware pointers, and updates
  *                            the WRITE idx.  If insufficient rx_free buffers
  *                            are available, schedules il_rx_replenish
  *
  * -- enable interrupts --
  * ISR - il_rx()         Detach il_rx_bufs from pool up to the
  *                            READ IDX, detaching the SKB from the pool.
  *                            Moves the packet buffer from queue to rx_used.
  *                            Calls il_rx_queue_restock to refill any empty
  *                            slots.
  * ...
  *
  */
 
 /*
  * il_rx_queue_space - Return number of free slots available in queue.
  */
 int
 il_rx_queue_space(const struct il_rx_queue *q)
 {
     int s = q->read - q->write;
     if (s <= 0)
         s += RX_QUEUE_SIZE;
     /* keep some buffer to not confuse full and empty queue */
     s -= 2;
     if (s < 0)
         s = 0;
     return s;
 }
 EXPORT_SYMBOL(il_rx_queue_space);
 
 /*
  * il_rx_queue_update_write_ptr - Update the write pointer for the RX queue
  */
 void
 il_rx_queue_update_write_ptr(struct il_priv *il, struct il_rx_queue *q)
 {
     unsigned long flags;
     u32 rx_wrt_ptr_reg = il->hw_params.rx_wrt_ptr_reg;
     u32 reg;
 
     spin_lock_irqsave(&q->lock, flags);
 
     if (q->need_update == 0)
         goto exit_unlock;
 
     /* If power-saving is in use, make sure device is awake */
     if (test_bit(S_POWER_PMI, &il->status)) {
         reg = _il_rd(il, CSR_UCODE_DRV_GP1);
 
         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
             D_INFO("Rx queue requesting wakeup," " GP1 = 0x%x\n",
                    reg);
             il_set_bit(il, CSR_GP_CNTRL,
                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
             goto exit_unlock;
         }
 
         q->write_actual = (q->write & ~0x7);
         il_wr(il, rx_wrt_ptr_reg, q->write_actual);
 
         /* Else device is assumed to be awake */
     } else {
         /* Device expects a multiple of 8 */
         q->write_actual = (q->write & ~0x7);
         il_wr(il, rx_wrt_ptr_reg, q->write_actual);
     }
 
     q->need_update = 0;
 
 exit_unlock:
     spin_unlock_irqrestore(&q->lock, flags);
 }
 EXPORT_SYMBOL(il_rx_queue_update_write_ptr);
 
 int
 il_rx_queue_alloc(struct il_priv *il)
 {
     struct il_rx_queue *rxq = &il->rxq;
     struct device *dev = &il->pci_dev->dev;
     int i;
 
     spin_lock_init(&rxq->lock);
     INIT_LIST_HEAD(&rxq->rx_free);
     INIT_LIST_HEAD(&rxq->rx_used);
 
     /* Alloc the circular buffer of Read Buffer Descriptors (RBDs) */
     rxq->bd = dma_alloc_coherent(dev, 4 * RX_QUEUE_SIZE, &rxq->bd_dma,
                      GFP_KERNEL);
     if (!rxq->bd)
         goto err_bd;
 
     rxq->rb_stts = dma_alloc_coherent(dev, sizeof(struct il_rb_status),
                       &rxq->rb_stts_dma, GFP_KERNEL);
     if (!rxq->rb_stts)
         goto err_rb;
 
     /* Fill the rx_used queue with _all_ of the Rx buffers */
     for (i = 0; i < RX_FREE_BUFFERS + RX_QUEUE_SIZE; i++)
         list_add_tail(&rxq->pool[i].list, &rxq->rx_used);
 
     /* Set us so that we have processed and used all buffers, but have
      * not restocked the Rx queue with fresh buffers */
     rxq->read = rxq->write = 0;
     rxq->write_actual = 0;
     rxq->free_count = 0;
     rxq->need_update = 0;
     return 0;
 
 err_rb:
     dma_free_coherent(&il->pci_dev->dev, 4 * RX_QUEUE_SIZE, rxq->bd,
               rxq->bd_dma);
 err_bd:
     return -ENOMEM;
 }
 EXPORT_SYMBOL(il_rx_queue_alloc);
 
 void
 il_hdl_spectrum_measurement(struct il_priv *il, struct il_rx_buf *rxb)
 {
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_spectrum_notification *report = &(pkt->u.spectrum_notif);
 
     if (!report->state) {
         D_11H("Spectrum Measure Notification: Start\n");
         return;
     }
 
     memcpy(&il->measure_report, report, sizeof(*report));
     il->measurement_status |= MEASUREMENT_READY;
 }
 EXPORT_SYMBOL(il_hdl_spectrum_measurement);
 
 /*
  * returns non-zero if packet should be dropped
  */
 int
 il_set_decrypted_flag(struct il_priv *il, struct ieee80211_hdr *hdr,
               u32 decrypt_res, struct ieee80211_rx_status *stats)
 {
     u16 fc = le16_to_cpu(hdr->frame_control);
 
     /*
      * All contexts have the same setting here due to it being
      * a module parameter, so OK to check any context.
      */
     if (il->active.filter_flags & RXON_FILTER_DIS_DECRYPT_MSK)
         return 0;
 
     if (!(fc & IEEE80211_FCTL_PROTECTED))
         return 0;
 
     D_RX("decrypt_res:0x%x\n", decrypt_res);
     switch (decrypt_res & RX_RES_STATUS_SEC_TYPE_MSK) {
     case RX_RES_STATUS_SEC_TYPE_TKIP:
         /* The uCode has got a bad phase 1 Key, pushes the packet.
          * Decryption will be done in SW. */
         if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
             RX_RES_STATUS_BAD_KEY_TTAK)
             break;
         fallthrough;
 
     case RX_RES_STATUS_SEC_TYPE_WEP:
         if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
             RX_RES_STATUS_BAD_ICV_MIC) {
             /* bad ICV, the packet is destroyed since the
              * decryption is inplace, drop it */
             D_RX("Packet destroyed\n");
             return -1;
         }
         fallthrough;
     case RX_RES_STATUS_SEC_TYPE_CCMP:
         if ((decrypt_res & RX_RES_STATUS_DECRYPT_TYPE_MSK) ==
             RX_RES_STATUS_DECRYPT_OK) {
             D_RX("hw decrypt successfully!!!\n");
             stats->flag |= RX_FLAG_DECRYPTED;
         }
         break;
 
     default:
         break;
     }
     return 0;
 }
 EXPORT_SYMBOL(il_set_decrypted_flag);
 
 /*
  * il_txq_update_write_ptr - Send new write idx to hardware
  */
 void
 il_txq_update_write_ptr(struct il_priv *il, struct il_tx_queue *txq)
 {
     u32 reg = 0;
     int txq_id = txq->q.id;
 
     if (txq->need_update == 0)
         return;
 
     /* if we're trying to save power */
     if (test_bit(S_POWER_PMI, &il->status)) {
         /* wake up nic if it's powered down ...
          * uCode will wake up, and interrupt us again, so next
          * time we'll skip this part. */
         reg = _il_rd(il, CSR_UCODE_DRV_GP1);
 
         if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
             D_INFO("Tx queue %d requesting wakeup," " GP1 = 0x%x\n",
                    txq_id, reg);
             il_set_bit(il, CSR_GP_CNTRL,
                    CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
             return;
         }
 
         il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
 
         /*
          * else not in power-save mode,
          * uCode will never sleep when we're
          * trying to tx (during RFKILL, we're not trying to tx).
          */
     } else
         _il_wr(il, HBUS_TARG_WRPTR, txq->q.write_ptr | (txq_id << 8));
     txq->need_update = 0;
 }
 EXPORT_SYMBOL(il_txq_update_write_ptr);
 
 /*
  * il_tx_queue_unmap -  Unmap any remaining DMA mappings and free skb's
  */
 void
 il_tx_queue_unmap(struct il_priv *il, int txq_id)
 {
     struct il_tx_queue *txq = &il->txq[txq_id];
     struct il_queue *q = &txq->q;
 
     if (q->n_bd == 0)
         return;
 
     while (q->write_ptr != q->read_ptr) {
         il->ops->txq_free_tfd(il, txq);
         q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
     }
 }
 EXPORT_SYMBOL(il_tx_queue_unmap);
 
 /*
  * il_tx_queue_free - Deallocate DMA queue.
  * @txq: Transmit queue to deallocate.
  *
  * Empty queue by removing and destroying all BD's.
  * Free all buffers.
  * 0-fill, but do not free "txq" descriptor structure.
  */
 void
 il_tx_queue_free(struct il_priv *il, int txq_id)
 {
     struct il_tx_queue *txq = &il->txq[txq_id];
     struct device *dev = &il->pci_dev->dev;
     int i;
 
     il_tx_queue_unmap(il, txq_id);
 
     /* De-alloc array of command/tx buffers */
     if (txq->cmd) {
         for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
             kfree(txq->cmd[i]);
     }
 
     /* De-alloc circular buffer of TFDs */
     if (txq->q.n_bd)
         dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
                   txq->tfds, txq->q.dma_addr);
 
     /* De-alloc array of per-TFD driver data */
     kfree(txq->skbs);
     txq->skbs = NULL;
 
     /* deallocate arrays */
     kfree(txq->cmd);
     kfree(txq->meta);
     txq->cmd = NULL;
     txq->meta = NULL;
 
     /* 0-fill queue descriptor structure */
     memset(txq, 0, sizeof(*txq));
 }
 EXPORT_SYMBOL(il_tx_queue_free);
 
 /*
  * il_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue
  */
 void
 il_cmd_queue_unmap(struct il_priv *il)
 {
     struct il_tx_queue *txq = &il->txq[il->cmd_queue];
     struct il_queue *q = &txq->q;
     int i;
 
     if (q->n_bd == 0)
         return;
 
     while (q->read_ptr != q->write_ptr) {
         i = il_get_cmd_idx(q, q->read_ptr, 0);
 
         if (txq->meta[i].flags & CMD_MAPPED) {
             dma_unmap_single(&il->pci_dev->dev,
                      dma_unmap_addr(&txq->meta[i], mapping),
                      dma_unmap_len(&txq->meta[i], len),
                      DMA_BIDIRECTIONAL);
             txq->meta[i].flags = 0;
         }
 
         q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd);
     }
 
     i = q->n_win;
     if (txq->meta[i].flags & CMD_MAPPED) {
         dma_unmap_single(&il->pci_dev->dev,
                  dma_unmap_addr(&txq->meta[i], mapping),
                  dma_unmap_len(&txq->meta[i], len),
                  DMA_BIDIRECTIONAL);
         txq->meta[i].flags = 0;
     }
 }
 EXPORT_SYMBOL(il_cmd_queue_unmap);
 
 /*
  * il_cmd_queue_free - Deallocate DMA queue.
  *
  * Empty queue by removing and destroying all BD's.
  * Free all buffers.
  * 0-fill, but do not free "txq" descriptor structure.
  */
 void
 il_cmd_queue_free(struct il_priv *il)
 {
     struct il_tx_queue *txq = &il->txq[il->cmd_queue];
     struct device *dev = &il->pci_dev->dev;
     int i;
 
     il_cmd_queue_unmap(il);
 
     /* De-alloc array of command/tx buffers */
     if (txq->cmd) {
         for (i = 0; i <= TFD_CMD_SLOTS; i++)
             kfree(txq->cmd[i]);
     }
 
     /* De-alloc circular buffer of TFDs */
     if (txq->q.n_bd)
         dma_free_coherent(dev, il->hw_params.tfd_size * txq->q.n_bd,
                   txq->tfds, txq->q.dma_addr);
 
     /* deallocate arrays */
     kfree(txq->cmd);
     kfree(txq->meta);
     txq->cmd = NULL;
     txq->meta = NULL;
 
     /* 0-fill queue descriptor structure */
     memset(txq, 0, sizeof(*txq));
 }
 EXPORT_SYMBOL(il_cmd_queue_free);
 
 /*************** DMA-QUEUE-GENERAL-FUNCTIONS  *****
  * DMA services
  *
  * Theory of operation
  *
  * A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
  * of buffer descriptors, each of which points to one or more data buffers for
  * the device to read from or fill.  Driver and device exchange status of each
  * queue via "read" and "write" pointers.  Driver keeps minimum of 2 empty
  * entries in each circular buffer, to protect against confusing empty and full
  * queue states.
  *
  * The device reads or writes the data in the queues via the device's several
  * DMA/FIFO channels.  Each queue is mapped to a single DMA channel.
  *
  * For Tx queue, there are low mark and high mark limits. If, after queuing
  * the packet for Tx, free space become < low mark, Tx queue stopped. When
  * reclaiming packets (on 'tx done IRQ), if free space become > high mark,
  * Tx queue resumed.
  *
  * See more detailed info in 4965.h.
  ***************************************************/
 
 int
 il_queue_space(const struct il_queue *q)
 {
     int s = q->read_ptr - q->write_ptr;
 
     if (q->read_ptr > q->write_ptr)
         s -= q->n_bd;
 
     if (s <= 0)
         s += q->n_win;
     /* keep some reserve to not confuse empty and full situations */
     s -= 2;
     if (s < 0)
         s = 0;
     return s;
 }
 EXPORT_SYMBOL(il_queue_space);
 
 
 /*
  * il_queue_init - Initialize queue's high/low-water and read/write idxes
  */
 static int
 il_queue_init(struct il_priv *il, struct il_queue *q, int slots, u32 id)
 {
     /*
      * TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
      * il_queue_inc_wrap and il_queue_dec_wrap are broken.
      */
     BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
     /* FIXME: remove q->n_bd */
     q->n_bd = TFD_QUEUE_SIZE_MAX;
 
     q->n_win = slots;
     q->id = id;
 
     /* slots_must be power-of-two size, otherwise
      * il_get_cmd_idx is broken. */
     BUG_ON(!is_power_of_2(slots));
 
     q->low_mark = q->n_win / 4;
     if (q->low_mark < 4)
         q->low_mark = 4;
 
     q->high_mark = q->n_win / 8;
     if (q->high_mark < 2)
         q->high_mark = 2;
 
     q->write_ptr = q->read_ptr = 0;
 
     return 0;
 }
 
 /*
  * il_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
  */
 static int
 il_tx_queue_alloc(struct il_priv *il, struct il_tx_queue *txq, u32 id)
 {
     struct device *dev = &il->pci_dev->dev;
     size_t tfd_sz = il->hw_params.tfd_size * TFD_QUEUE_SIZE_MAX;
 
     /* Driver ilate data, only for Tx (not command) queues,
      * not shared with device. */
     if (id != il->cmd_queue) {
         txq->skbs = kcalloc(TFD_QUEUE_SIZE_MAX,
                     sizeof(struct sk_buff *),
                     GFP_KERNEL);
         if (!txq->skbs) {
             IL_ERR("Fail to alloc skbs\n");
             goto error;
         }
     } else
         txq->skbs = NULL;
 
     /* Circular buffer of transmit frame descriptors (TFDs),
      * shared with device */
     txq->tfds =
         dma_alloc_coherent(dev, tfd_sz, &txq->q.dma_addr, GFP_KERNEL);
     if (!txq->tfds)
         goto error;
 
     txq->q.id = id;
 
     return 0;
 
 error:
     kfree(txq->skbs);
     txq->skbs = NULL;
 
     return -ENOMEM;
 }
 
 /*
  * il_tx_queue_init - Allocate and initialize one tx/cmd queue
  */
 int
 il_tx_queue_init(struct il_priv *il, u32 txq_id)
 {
     int i, len, ret;
     int slots, actual_slots;
     struct il_tx_queue *txq = &il->txq[txq_id];
 
     /*
      * Alloc buffer array for commands (Tx or other types of commands).
      * For the command queue (#4/#9), allocate command space + one big
      * command for scan, since scan command is very huge; the system will
      * not have two scans at the same time, so only one is needed.
      * For normal Tx queues (all other queues), no super-size command
      * space is needed.
      */
     if (txq_id == il->cmd_queue) {
         slots = TFD_CMD_SLOTS;
         actual_slots = slots + 1;
     } else {
         slots = TFD_TX_CMD_SLOTS;
         actual_slots = slots;
     }
 
     txq->meta =
         kcalloc(actual_slots, sizeof(struct il_cmd_meta), GFP_KERNEL);
     txq->cmd =
         kcalloc(actual_slots, sizeof(struct il_device_cmd *), GFP_KERNEL);
 
     if (!txq->meta || !txq->cmd)
         goto out_free_arrays;
 
     len = sizeof(struct il_device_cmd);
     for (i = 0; i < actual_slots; i++) {
         /* only happens for cmd queue */
         if (i == slots)
             len = IL_MAX_CMD_SIZE;
 
         txq->cmd[i] = kmalloc(len, GFP_KERNEL);
         if (!txq->cmd[i])
             goto err;
     }
 
     /* Alloc driver data array and TFD circular buffer */
     ret = il_tx_queue_alloc(il, txq, txq_id);
     if (ret)
         goto err;
 
     txq->need_update = 0;
 
     /*
      * For the default queues 0-3, set up the swq_id
      * already -- all others need to get one later
      * (if they need one at all).
      */
     if (txq_id < 4)
         il_set_swq_id(txq, txq_id, txq_id);
 
     /* Initialize queue's high/low-water marks, and head/tail idxes */
     il_queue_init(il, &txq->q, slots, txq_id);
 
     /* Tell device where to find queue */
     il->ops->txq_init(il, txq);
 
     return 0;
 err:
     for (i = 0; i < actual_slots; i++)
         kfree(txq->cmd[i]);
 out_free_arrays:
     kfree(txq->meta);
     txq->meta = NULL;
     kfree(txq->cmd);
     txq->cmd = NULL;
 
     return -ENOMEM;
 }
 EXPORT_SYMBOL(il_tx_queue_init);
 
 void
 il_tx_queue_reset(struct il_priv *il, u32 txq_id)
 {
     int slots, actual_slots;
     struct il_tx_queue *txq = &il->txq[txq_id];
 
     if (txq_id == il->cmd_queue) {
         slots = TFD_CMD_SLOTS;
         actual_slots = TFD_CMD_SLOTS + 1;
     } else {
         slots = TFD_TX_CMD_SLOTS;
         actual_slots = TFD_TX_CMD_SLOTS;
     }
 
     memset(txq->meta, 0, sizeof(struct il_cmd_meta) * actual_slots);
     txq->need_update = 0;
 
     /* Initialize queue's high/low-water marks, and head/tail idxes */
     il_queue_init(il, &txq->q, slots, txq_id);
 
     /* Tell device where to find queue */
     il->ops->txq_init(il, txq);
 }
 EXPORT_SYMBOL(il_tx_queue_reset);
 
 /*************** HOST COMMAND QUEUE FUNCTIONS   *****/
 
 /*
  * il_enqueue_hcmd - enqueue a uCode command
  * @il: device ilate data point
  * @cmd: a point to the ucode command structure
  *
  * The function returns < 0 values to indicate the operation is
  * failed. On success, it turns the idx (> 0) of command in the
  * command queue.
  */
 int
 il_enqueue_hcmd(struct il_priv *il, struct il_host_cmd *cmd)
 {
     struct il_tx_queue *txq = &il->txq[il->cmd_queue];
     struct il_queue *q = &txq->q;
     struct il_device_cmd *out_cmd;
     struct il_cmd_meta *out_meta;
     dma_addr_t phys_addr;
     unsigned long flags;
     u32 idx;
     u16 fix_size;
 
     cmd->len = il->ops->get_hcmd_size(cmd->id, cmd->len);
     fix_size = (u16) (cmd->len + sizeof(out_cmd->hdr));
 
     /* If any of the command structures end up being larger than
      * the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
      * we will need to increase the size of the TFD entries
      * Also, check to see if command buffer should not exceed the size
      * of device_cmd and max_cmd_size. */
     BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
            !(cmd->flags & CMD_SIZE_HUGE));
     BUG_ON(fix_size > IL_MAX_CMD_SIZE);
 
     if (il_is_rfkill(il) || il_is_ctkill(il)) {
         IL_WARN("Not sending command - %s KILL\n",
             il_is_rfkill(il) ? "RF" : "CT");
         return -EIO;
     }
 
     spin_lock_irqsave(&il->hcmd_lock, flags);
 
     if (il_queue_space(q) < ((cmd->flags & CMD_ASYNC) ? 2 : 1)) {
         spin_unlock_irqrestore(&il->hcmd_lock, flags);
 
         IL_ERR("Restarting adapter due to command queue full\n");
         queue_work(il->workqueue, &il->restart);
         return -ENOSPC;
     }
 
     idx = il_get_cmd_idx(q, q->write_ptr, cmd->flags & CMD_SIZE_HUGE);
     out_cmd = txq->cmd[idx];
     out_meta = &txq->meta[idx];
 
     if (WARN_ON(out_meta->flags & CMD_MAPPED)) {
         spin_unlock_irqrestore(&il->hcmd_lock, flags);
         return -ENOSPC;
     }
 
     memset(out_meta, 0, sizeof(*out_meta)); /* re-initialize to NULL */
     out_meta->flags = cmd->flags | CMD_MAPPED;
     if (cmd->flags & CMD_WANT_SKB)
         out_meta->source = cmd;
     if (cmd->flags & CMD_ASYNC)
         out_meta->callback = cmd->callback;
 
     out_cmd->hdr.cmd = cmd->id;
     memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);
 
     /* At this point, the out_cmd now has all of the incoming cmd
      * information */
 
     out_cmd->hdr.flags = 0;
     out_cmd->hdr.sequence =
         cpu_to_le16(QUEUE_TO_SEQ(il->cmd_queue) | IDX_TO_SEQ(q->write_ptr));
     if (cmd->flags & CMD_SIZE_HUGE)
         out_cmd->hdr.sequence |= SEQ_HUGE_FRAME;
 
 #ifdef CONFIG_IWLEGACY_DEBUG
     switch (out_cmd->hdr.cmd) {
     case C_TX_LINK_QUALITY_CMD:
     case C_SENSITIVITY:
         D_HC_DUMP("Sending command %s (#%x), seq: 0x%04X, "
               "%d bytes at %d[%d]:%d\n",
               il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
               le16_to_cpu(out_cmd->hdr.sequence), fix_size,
               q->write_ptr, idx, il->cmd_queue);
         break;
     default:
         D_HC("Sending command %s (#%x), seq: 0x%04X, "
              "%d bytes at %d[%d]:%d\n",
              il_get_cmd_string(out_cmd->hdr.cmd), out_cmd->hdr.cmd,
              le16_to_cpu(out_cmd->hdr.sequence), fix_size, q->write_ptr,
              idx, il->cmd_queue);
     }
 #endif
 
     phys_addr = dma_map_single(&il->pci_dev->dev, &out_cmd->hdr, fix_size,
                    DMA_BIDIRECTIONAL);
     if (unlikely(dma_mapping_error(&il->pci_dev->dev, phys_addr))) {
         idx = -ENOMEM;
         goto out;
     }
     dma_unmap_addr_set(out_meta, mapping, phys_addr);
     dma_unmap_len_set(out_meta, len, fix_size);
 
     txq->need_update = 1;
 
     if (il->ops->txq_update_byte_cnt_tbl)
         /* Set up entry in queue's byte count circular buffer */
         il->ops->txq_update_byte_cnt_tbl(il, txq, 0);
 
     il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, fix_size, 1,
                         U32_PAD(cmd->len));
 
     /* Increment and update queue's write idx */
     q->write_ptr = il_queue_inc_wrap(q->write_ptr, q->n_bd);
     il_txq_update_write_ptr(il, txq);
 
 out:
     spin_unlock_irqrestore(&il->hcmd_lock, flags);
     return idx;
 }
 
 /*
  * il_hcmd_queue_reclaim - Reclaim TX command queue entries already Tx'd
  *
  * When FW advances 'R' idx, all entries between old and new 'R' idx
  * need to be reclaimed. As result, some free space forms.  If there is
  * enough free space (> low mark), wake the stack that feeds us.
  */
 static void
 il_hcmd_queue_reclaim(struct il_priv *il, int txq_id, int idx, int cmd_idx)
 {
     struct il_tx_queue *txq = &il->txq[txq_id];
     struct il_queue *q = &txq->q;
     int nfreed = 0;
 
     if (idx >= q->n_bd || il_queue_used(q, idx) == 0) {
         IL_ERR("Read idx for DMA queue txq id (%d), idx %d, "
                "is out of range [0-%d] %d %d.\n", txq_id, idx, q->n_bd,
                q->write_ptr, q->read_ptr);
         return;
     }
 
     for (idx = il_queue_inc_wrap(idx, q->n_bd); q->read_ptr != idx;
          q->read_ptr = il_queue_inc_wrap(q->read_ptr, q->n_bd)) {
 
         if (nfreed++ > 0) {
             IL_ERR("HCMD skipped: idx (%d) %d %d\n", idx,
                    q->write_ptr, q->read_ptr);
             queue_work(il->workqueue, &il->restart);
         }
 
     }
 }
 
 /*
  * il_tx_cmd_complete - Pull unused buffers off the queue and reclaim them
  * @rxb: Rx buffer to reclaim
  *
  * If an Rx buffer has an async callback associated with it the callback
  * will be executed.  The attached skb (if present) will only be freed
  * if the callback returns 1
  */
 void
 il_tx_cmd_complete(struct il_priv *il, struct il_rx_buf *rxb)
 {
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     u16 sequence = le16_to_cpu(pkt->hdr.sequence);
     int txq_id = SEQ_TO_QUEUE(sequence);
     int idx = SEQ_TO_IDX(sequence);
     int cmd_idx;
     bool huge = !!(pkt->hdr.sequence & SEQ_HUGE_FRAME);
     struct il_device_cmd *cmd;
     struct il_cmd_meta *meta;
     struct il_tx_queue *txq = &il->txq[il->cmd_queue];
     unsigned long flags;
 
     /* If a Tx command is being handled and it isn't in the actual
      * command queue then there a command routing bug has been introduced
      * in the queue management code. */
     if (WARN
         (txq_id != il->cmd_queue,
          "wrong command queue %d (should be %d), sequence 0x%X readp=%d writep=%d\n",
          txq_id, il->cmd_queue, sequence, il->txq[il->cmd_queue].q.read_ptr,
          il->txq[il->cmd_queue].q.write_ptr)) {
         il_print_hex_error(il, pkt, 32);
         return;
     }
 
     cmd_idx = il_get_cmd_idx(&txq->q, idx, huge);
     cmd = txq->cmd[cmd_idx];
     meta = &txq->meta[cmd_idx];
 
     txq->time_stamp = jiffies;
 
     dma_unmap_single(&il->pci_dev->dev, dma_unmap_addr(meta, mapping),
              dma_unmap_len(meta, len), DMA_BIDIRECTIONAL);
 
     /* Input error checking is done when commands are added to queue. */
     if (meta->flags & CMD_WANT_SKB) {
         meta->source->reply_page = (unsigned long)rxb_addr(rxb);
         rxb->page = NULL;
     } else if (meta->callback)
         meta->callback(il, cmd, pkt);
 
     spin_lock_irqsave(&il->hcmd_lock, flags);
 
     il_hcmd_queue_reclaim(il, txq_id, idx, cmd_idx);
 
     if (!(meta->flags & CMD_ASYNC)) {
         clear_bit(S_HCMD_ACTIVE, &il->status);
         D_INFO("Clearing HCMD_ACTIVE for command %s\n",
                il_get_cmd_string(cmd->hdr.cmd));
         wake_up(&il->wait_command_queue);
     }
 
     /* Mark as unmapped */
     meta->flags = 0;
 
     spin_unlock_irqrestore(&il->hcmd_lock, flags);
 }
 EXPORT_SYMBOL(il_tx_cmd_complete);
 
 MODULE_DESCRIPTION("iwl-legacy: common functions for 3945 and 4965");
 MODULE_VERSION(IWLWIFI_VERSION);
 MODULE_AUTHOR(DRV_COPYRIGHT " " DRV_AUTHOR);
 MODULE_LICENSE("GPL");
 
 /*
  * set bt_coex_active to true, uCode will do kill/defer
  * every time the priority line is asserted (BT is sending signals on the
  * priority line in the PCIx).
  * set bt_coex_active to false, uCode will ignore the BT activity and
  * perform the normal operation
  *
  * User might experience transmit issue on some platform due to WiFi/BT
  * co-exist problem. The possible behaviors are:
  *   Able to scan and finding all the available AP
  *   Not able to associate with any AP
  * On those platforms, WiFi communication can be restored by set
  * "bt_coex_active" module parameter to "false"
  *
  * default: bt_coex_active = true (BT_COEX_ENABLE)
  */
 static bool bt_coex_active = true;
 module_param(bt_coex_active, bool, 0444);
 MODULE_PARM_DESC(bt_coex_active, "enable wifi/bluetooth co-exist");
 
 u32 il_debug_level;
 EXPORT_SYMBOL(il_debug_level);
 
 const u8 il_bcast_addr[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
 EXPORT_SYMBOL(il_bcast_addr);
 
 #define MAX_BIT_RATE_40_MHZ 150 /* Mbps */
 #define MAX_BIT_RATE_20_MHZ 72  /* Mbps */
 static void
 il_init_ht_hw_capab(const struct il_priv *il,
             struct ieee80211_sta_ht_cap *ht_info,
             enum nl80211_band band)
 {
     u16 max_bit_rate = 0;
     u8 rx_chains_num = il->hw_params.rx_chains_num;
     u8 tx_chains_num = il->hw_params.tx_chains_num;
 
     ht_info->cap = 0;
     memset(&ht_info->mcs, 0, sizeof(ht_info->mcs));
 
     ht_info->ht_supported = true;
 
     ht_info->cap |= IEEE80211_HT_CAP_SGI_20;
     max_bit_rate = MAX_BIT_RATE_20_MHZ;
     if (il->hw_params.ht40_channel & BIT(band)) {
         ht_info->cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
         ht_info->cap |= IEEE80211_HT_CAP_SGI_40;
         ht_info->mcs.rx_mask[4] = 0x01;
         max_bit_rate = MAX_BIT_RATE_40_MHZ;
     }
 
     if (il->cfg->mod_params->amsdu_size_8K)
         ht_info->cap |= IEEE80211_HT_CAP_MAX_AMSDU;
 
     ht_info->ampdu_factor = CFG_HT_RX_AMPDU_FACTOR_DEF;
     ht_info->ampdu_density = CFG_HT_MPDU_DENSITY_DEF;
 
     ht_info->mcs.rx_mask[0] = 0xFF;
     if (rx_chains_num >= 2)
         ht_info->mcs.rx_mask[1] = 0xFF;
     if (rx_chains_num >= 3)
         ht_info->mcs.rx_mask[2] = 0xFF;
 
     /* Highest supported Rx data rate */
     max_bit_rate *= rx_chains_num;
     WARN_ON(max_bit_rate & ~IEEE80211_HT_MCS_RX_HIGHEST_MASK);
     ht_info->mcs.rx_highest = cpu_to_le16(max_bit_rate);
 
     /* Tx MCS capabilities */
     ht_info->mcs.tx_params = IEEE80211_HT_MCS_TX_DEFINED;
     if (tx_chains_num != rx_chains_num) {
         ht_info->mcs.tx_params |= IEEE80211_HT_MCS_TX_RX_DIFF;
         ht_info->mcs.tx_params |=
             ((tx_chains_num -
               1) << IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT);
     }
 }
 
 /*
  * il_init_geos - Initialize mac80211's geo/channel info based from eeprom
  */
 int
 il_init_geos(struct il_priv *il)
 {
     struct il_channel_info *ch;
     struct ieee80211_supported_band *sband;
     struct ieee80211_channel *channels;
     struct ieee80211_channel *geo_ch;
     struct ieee80211_rate *rates;
     int i = 0;
     s8 max_tx_power = 0;
 
     if (il->bands[NL80211_BAND_2GHZ].n_bitrates ||
         il->bands[NL80211_BAND_5GHZ].n_bitrates) {
         D_INFO("Geography modes already initialized.\n");
         set_bit(S_GEO_CONFIGURED, &il->status);
         return 0;
     }
 
     channels =
         kcalloc(il->channel_count, sizeof(struct ieee80211_channel),
             GFP_KERNEL);
     if (!channels)
         return -ENOMEM;
 
     rates =
         kzalloc((sizeof(struct ieee80211_rate) * RATE_COUNT_LEGACY),
             GFP_KERNEL);
     if (!rates) {
         kfree(channels);
         return -ENOMEM;
     }
 
     /* 5.2GHz channels start after the 2.4GHz channels */
     sband = &il->bands[NL80211_BAND_5GHZ];
     sband->channels = &channels[ARRAY_SIZE(il_eeprom_band_1)];
     /* just OFDM */
     sband->bitrates = &rates[IL_FIRST_OFDM_RATE];
     sband->n_bitrates = RATE_COUNT_LEGACY - IL_FIRST_OFDM_RATE;
 
     if (il->cfg->sku & IL_SKU_N)
         il_init_ht_hw_capab(il, &sband->ht_cap, NL80211_BAND_5GHZ);
 
     sband = &il->bands[NL80211_BAND_2GHZ];
     sband->channels = channels;
     /* OFDM & CCK */
     sband->bitrates = rates;
     sband->n_bitrates = RATE_COUNT_LEGACY;
 
     if (il->cfg->sku & IL_SKU_N)
         il_init_ht_hw_capab(il, &sband->ht_cap, NL80211_BAND_2GHZ);
 
     il->ieee_channels = channels;
     il->ieee_rates = rates;
 
     for (i = 0; i < il->channel_count; i++) {
         ch = &il->channel_info[i];
 
         if (!il_is_channel_valid(ch))
             continue;
 
         sband = &il->bands[ch->band];
 
         geo_ch = &sband->channels[sband->n_channels++];
 
         geo_ch->center_freq =
             ieee80211_channel_to_frequency(ch->channel, ch->band);
         geo_ch->max_power = ch->max_power_avg;
         geo_ch->max_antenna_gain = 0xff;
         geo_ch->hw_value = ch->channel;
 
         if (il_is_channel_valid(ch)) {
             if (!(ch->flags & EEPROM_CHANNEL_IBSS))
                 geo_ch->flags |= IEEE80211_CHAN_NO_IR;
 
             if (!(ch->flags & EEPROM_CHANNEL_ACTIVE))
                 geo_ch->flags |= IEEE80211_CHAN_NO_IR;
 
             if (ch->flags & EEPROM_CHANNEL_RADAR)
                 geo_ch->flags |= IEEE80211_CHAN_RADAR;
 
             geo_ch->flags |= ch->ht40_extension_channel;
 
             if (ch->max_power_avg > max_tx_power)
                 max_tx_power = ch->max_power_avg;
         } else {
             geo_ch->flags |= IEEE80211_CHAN_DISABLED;
         }
 
         D_INFO("Channel %d Freq=%d[%sGHz] %s flag=0x%X\n", ch->channel,
                geo_ch->center_freq,
                il_is_channel_a_band(ch) ? "5.2" : "2.4",
                geo_ch->
                flags & IEEE80211_CHAN_DISABLED ? "restricted" : "valid",
                geo_ch->flags);
     }
 
     il->tx_power_device_lmt = max_tx_power;
     il->tx_power_user_lmt = max_tx_power;
     il->tx_power_next = max_tx_power;
 
     if (il->bands[NL80211_BAND_5GHZ].n_channels == 0 &&
         (il->cfg->sku & IL_SKU_A)) {
         IL_INFO("Incorrectly detected BG card as ABG. "
             "Please send your PCI ID 0x%04X:0x%04X to maintainer.\n",
             il->pci_dev->device, il->pci_dev->subsystem_device);
         il->cfg->sku &= ~IL_SKU_A;
     }
 
     IL_INFO("Tunable channels: %d 802.11bg, %d 802.11a channels\n",
         il->bands[NL80211_BAND_2GHZ].n_channels,
         il->bands[NL80211_BAND_5GHZ].n_channels);
 
     set_bit(S_GEO_CONFIGURED, &il->status);
 
     return 0;
 }
 EXPORT_SYMBOL(il_init_geos);
 
 /*
  * il_free_geos - undo allocations in il_init_geos
  */
 void
 il_free_geos(struct il_priv *il)
 {
     kfree(il->ieee_channels);
     kfree(il->ieee_rates);
     clear_bit(S_GEO_CONFIGURED, &il->status);
 }
 EXPORT_SYMBOL(il_free_geos);
 
 static bool
 il_is_channel_extension(struct il_priv *il, enum nl80211_band band,
             u16 channel, u8 extension_chan_offset)
 {
     const struct il_channel_info *ch_info;
 
     ch_info = il_get_channel_info(il, band, channel);
     if (!il_is_channel_valid(ch_info))
         return false;
 
     if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_ABOVE)
         return !(ch_info->
              ht40_extension_channel & IEEE80211_CHAN_NO_HT40PLUS);
     else if (extension_chan_offset == IEEE80211_HT_PARAM_CHA_SEC_BELOW)
         return !(ch_info->
              ht40_extension_channel & IEEE80211_CHAN_NO_HT40MINUS);
 
     return false;
 }
 
 bool
 il_is_ht40_tx_allowed(struct il_priv *il, struct ieee80211_sta_ht_cap *ht_cap)
 {
     if (!il->ht.enabled || !il->ht.is_40mhz)
         return false;
 
     /*
      * We do not check for IEEE80211_HT_CAP_SUP_WIDTH_20_40
      * the bit will not set if it is pure 40MHz case
      */
     if (ht_cap && !ht_cap->ht_supported)
         return false;
 
 #ifdef CONFIG_IWLEGACY_DEBUGFS
     if (il->disable_ht40)
         return false;
 #endif
 
     return il_is_channel_extension(il, il->band,
                        le16_to_cpu(il->staging.channel),
                        il->ht.extension_chan_offset);
 }
 EXPORT_SYMBOL(il_is_ht40_tx_allowed);
 
 static u16 noinline
 il_adjust_beacon_interval(u16 beacon_val, u16 max_beacon_val)
 {
     u16 new_val;
     u16 beacon_factor;
 
     /*
      * If mac80211 hasn't given us a beacon interval, program
      * the default into the device.
      */
     if (!beacon_val)
         return DEFAULT_BEACON_INTERVAL;
 
     /*
      * If the beacon interval we obtained from the peer
      * is too large, we'll have to wake up more often
      * (and in IBSS case, we'll beacon too much)
      *
      * For example, if max_beacon_val is 4096, and the
      * requested beacon interval is 7000, we'll have to
      * use 3500 to be able to wake up on the beacons.
      *
      * This could badly influence beacon detection stats.
      */
 
     beacon_factor = (beacon_val + max_beacon_val) / max_beacon_val;
     new_val = beacon_val / beacon_factor;
 
     if (!new_val)
         new_val = max_beacon_val;
 
     return new_val;
 }
 
 int
 il_send_rxon_timing(struct il_priv *il)
 {
     u64 tsf;
     s32 interval_tm, rem;
     struct ieee80211_conf *conf = NULL;
     u16 beacon_int;
     struct ieee80211_vif *vif = il->vif;
 
     conf = &il->hw->conf;
 
     lockdep_assert_held(&il->mutex);
 
     memset(&il->timing, 0, sizeof(struct il_rxon_time_cmd));
 
     il->timing.timestamp = cpu_to_le64(il->timestamp);
     il->timing.listen_interval = cpu_to_le16(conf->listen_interval);
 
     beacon_int = vif ? vif->bss_conf.beacon_int : 0;
 
     /*
      * TODO: For IBSS we need to get atim_win from mac80211,
      *       for now just always use 0
      */
     il->timing.atim_win = 0;
 
     beacon_int =
         il_adjust_beacon_interval(beacon_int,
                       il->hw_params.max_beacon_itrvl *
                       TIME_UNIT);
     il->timing.beacon_interval = cpu_to_le16(beacon_int);
 
     tsf = il->timestamp;    /* tsf is modifed by do_div: copy it */
     interval_tm = beacon_int * TIME_UNIT;
     rem = do_div(tsf, interval_tm);
     il->timing.beacon_init_val = cpu_to_le32(interval_tm - rem);
 
     il->timing.dtim_period = vif ? (vif->bss_conf.dtim_period ? : 1) : 1;
 
     D_ASSOC("beacon interval %d beacon timer %d beacon tim %d\n",
         le16_to_cpu(il->timing.beacon_interval),
         le32_to_cpu(il->timing.beacon_init_val),
         le16_to_cpu(il->timing.atim_win));
 
     return il_send_cmd_pdu(il, C_RXON_TIMING, sizeof(il->timing),
                    &il->timing);
 }
 EXPORT_SYMBOL(il_send_rxon_timing);
 
 void
 il_set_rxon_hwcrypto(struct il_priv *il, int hw_decrypt)
 {
     struct il_rxon_cmd *rxon = &il->staging;
 
     if (hw_decrypt)
         rxon->filter_flags &= ~RXON_FILTER_DIS_DECRYPT_MSK;
     else
         rxon->filter_flags |= RXON_FILTER_DIS_DECRYPT_MSK;
 
 }
 EXPORT_SYMBOL(il_set_rxon_hwcrypto);
 
 /* validate RXON structure is valid */
 int
 il_check_rxon_cmd(struct il_priv *il)
 {
     struct il_rxon_cmd *rxon = &il->staging;
     bool error = false;
 
     if (rxon->flags & RXON_FLG_BAND_24G_MSK) {
         if (rxon->flags & RXON_FLG_TGJ_NARROW_BAND_MSK) {
             IL_WARN("check 2.4G: wrong narrow\n");
             error = true;
         }
         if (rxon->flags & RXON_FLG_RADAR_DETECT_MSK) {
             IL_WARN("check 2.4G: wrong radar\n");
             error = true;
         }
     } else {
         if (!(rxon->flags & RXON_FLG_SHORT_SLOT_MSK)) {
             IL_WARN("check 5.2G: not short slot!\n");
             error = true;
         }
         if (rxon->flags & RXON_FLG_CCK_MSK) {
             IL_WARN("check 5.2G: CCK!\n");
             error = true;
         }
     }
     if ((rxon->node_addr[0] | rxon->bssid_addr[0]) & 0x1) {
         IL_WARN("mac/bssid mcast!\n");
         error = true;
     }
 
     /* make sure basic rates 6Mbps and 1Mbps are supported */
     if ((rxon->ofdm_basic_rates & RATE_6M_MASK) == 0 &&
         (rxon->cck_basic_rates & RATE_1M_MASK) == 0) {
         IL_WARN("neither 1 nor 6 are basic\n");
         error = true;
     }
 
     if (le16_to_cpu(rxon->assoc_id) > 2007) {
         IL_WARN("aid > 2007\n");
         error = true;
     }
 
     if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) ==
         (RXON_FLG_CCK_MSK | RXON_FLG_SHORT_SLOT_MSK)) {
         IL_WARN("CCK and short slot\n");
         error = true;
     }
 
     if ((rxon->flags & (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) ==
         (RXON_FLG_CCK_MSK | RXON_FLG_AUTO_DETECT_MSK)) {
         IL_WARN("CCK and auto detect");
         error = true;
     }
 
     if ((rxon->
          flags & (RXON_FLG_AUTO_DETECT_MSK | RXON_FLG_TGG_PROTECT_MSK)) ==
         RXON_FLG_TGG_PROTECT_MSK) {
         IL_WARN("TGg but no auto-detect\n");
         error = true;
     }
 
     if (error)
         IL_WARN("Tuning to channel %d\n", le16_to_cpu(rxon->channel));
 
     if (error) {
         IL_ERR("Invalid RXON\n");
         return -EINVAL;
     }
     return 0;
 }
 EXPORT_SYMBOL(il_check_rxon_cmd);
 
 /*
  * il_full_rxon_required - check if full RXON (vs RXON_ASSOC) cmd is needed
  * @il: staging_rxon is compared to active_rxon
  *
  * If the RXON structure is changing enough to require a new tune,
  * or is clearing the RXON_FILTER_ASSOC_MSK, then return 1 to indicate that
  * a new tune (full RXON command, rather than RXON_ASSOC cmd) is required.
  */
 int
 il_full_rxon_required(struct il_priv *il)
 {
     const struct il_rxon_cmd *staging = &il->staging;
     const struct il_rxon_cmd *active = &il->active;
 
 #define CHK(cond)                           \
     if ((cond)) {                           \
         D_INFO("need full RXON - " #cond "\n"); \
         return 1;                       \
     }
 
 #define CHK_NEQ(c1, c2)                     \
     if ((c1) != (c2)) {                 \
         D_INFO("need full RXON - "  \
                    #c1 " != " #c2 " - %d != %d\n",  \
                    (c1), (c2));         \
         return 1;                   \
     }
 
     /* These items are only settable from the full RXON command */
     CHK(!il_is_associated(il));
     CHK(!ether_addr_equal_64bits(staging->bssid_addr, active->bssid_addr));
     CHK(!ether_addr_equal_64bits(staging->node_addr, active->node_addr));
     CHK(!ether_addr_equal_64bits(staging->wlap_bssid_addr,
                      active->wlap_bssid_addr));
     CHK_NEQ(staging->dev_type, active->dev_type);
     CHK_NEQ(staging->channel, active->channel);
     CHK_NEQ(staging->air_propagation, active->air_propagation);
     CHK_NEQ(staging->ofdm_ht_single_stream_basic_rates,
         active->ofdm_ht_single_stream_basic_rates);
     CHK_NEQ(staging->ofdm_ht_dual_stream_basic_rates,
         active->ofdm_ht_dual_stream_basic_rates);
     CHK_NEQ(staging->assoc_id, active->assoc_id);
 
     /* flags, filter_flags, ofdm_basic_rates, and cck_basic_rates can
      * be updated with the RXON_ASSOC command -- however only some
      * flag transitions are allowed using RXON_ASSOC */
 
     /* Check if we are not switching bands */
     CHK_NEQ(staging->flags & RXON_FLG_BAND_24G_MSK,
         active->flags & RXON_FLG_BAND_24G_MSK);
 
     /* Check if we are switching association toggle */
     CHK_NEQ(staging->filter_flags & RXON_FILTER_ASSOC_MSK,
         active->filter_flags & RXON_FILTER_ASSOC_MSK);
 
 #undef CHK
 #undef CHK_NEQ
 
     return 0;
 }
 EXPORT_SYMBOL(il_full_rxon_required);
 
 u8
 il_get_lowest_plcp(struct il_priv *il)
 {
     /*
      * Assign the lowest rate -- should really get this from
      * the beacon skb from mac80211.
      */
     if (il->staging.flags & RXON_FLG_BAND_24G_MSK)
         return RATE_1M_PLCP;
     else
         return RATE_6M_PLCP;
 }
 EXPORT_SYMBOL(il_get_lowest_plcp);
 
 static void
 _il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
 {
     struct il_rxon_cmd *rxon = &il->staging;
 
     if (!il->ht.enabled) {
         rxon->flags &=
             ~(RXON_FLG_CHANNEL_MODE_MSK |
               RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK | RXON_FLG_HT40_PROT_MSK
               | RXON_FLG_HT_PROT_MSK);
         return;
     }
 
     rxon->flags |=
         cpu_to_le32(il->ht.protection << RXON_FLG_HT_OPERATING_MODE_POS);
 
     /* Set up channel bandwidth:
      * 20 MHz only, 20/40 mixed or pure 40 if ht40 ok */
     /* clear the HT channel mode before set the mode */
     rxon->flags &=
         ~(RXON_FLG_CHANNEL_MODE_MSK | RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
     if (il_is_ht40_tx_allowed(il, NULL)) {
         /* pure ht40 */
         if (il->ht.protection == IEEE80211_HT_OP_MODE_PROTECTION_20MHZ) {
             rxon->flags |= RXON_FLG_CHANNEL_MODE_PURE_40;
             /* Note: control channel is opposite of extension channel */
             switch (il->ht.extension_chan_offset) {
             case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                 rxon->flags &=
                     ~RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                 break;
             case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                 break;
             }
         } else {
             /* Note: control channel is opposite of extension channel */
             switch (il->ht.extension_chan_offset) {
             case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
                 rxon->flags &=
                     ~(RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK);
                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
                 break;
             case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
                 rxon->flags |= RXON_FLG_CTRL_CHANNEL_LOC_HI_MSK;
                 rxon->flags |= RXON_FLG_CHANNEL_MODE_MIXED;
                 break;
             case IEEE80211_HT_PARAM_CHA_SEC_NONE:
             default:
                 /* channel location only valid if in Mixed mode */
                 IL_ERR("invalid extension channel offset\n");
                 break;
             }
         }
     } else {
         rxon->flags |= RXON_FLG_CHANNEL_MODE_LEGACY;
     }
 
     if (il->ops->set_rxon_chain)
         il->ops->set_rxon_chain(il);
 
     D_ASSOC("rxon flags 0x%X operation mode :0x%X "
         "extension channel offset 0x%x\n", le32_to_cpu(rxon->flags),
         il->ht.protection, il->ht.extension_chan_offset);
 }
 
 void
 il_set_rxon_ht(struct il_priv *il, struct il_ht_config *ht_conf)
 {
     _il_set_rxon_ht(il, ht_conf);
 }
 EXPORT_SYMBOL(il_set_rxon_ht);
 
 /* Return valid, unused, channel for a passive scan to reset the RF */
 u8
 il_get_single_channel_number(struct il_priv *il, enum nl80211_band band)
 {
     const struct il_channel_info *ch_info;
     int i;
     u8 channel = 0;
     u8 min, max;
 
     if (band == NL80211_BAND_5GHZ) {
         min = 14;
         max = il->channel_count;
     } else {
         min = 0;
         max = 14;
     }
 
     for (i = min; i < max; i++) {
         channel = il->channel_info[i].channel;
         if (channel == le16_to_cpu(il->staging.channel))
             continue;
 
         ch_info = il_get_channel_info(il, band, channel);
         if (il_is_channel_valid(ch_info))
             break;
     }
 
     return channel;
 }
 EXPORT_SYMBOL(il_get_single_channel_number);
 
 /*
  * il_set_rxon_channel - Set the band and channel values in staging RXON
  * @ch: requested channel as a pointer to struct ieee80211_channel
 
  * NOTE:  Does not commit to the hardware; it sets appropriate bit fields
  * in the staging RXON flag structure based on the ch->band
  */
 int
 il_set_rxon_channel(struct il_priv *il, struct ieee80211_channel *ch)
 {
     enum nl80211_band band = ch->band;
     u16 channel = ch->hw_value;
 
     if (le16_to_cpu(il->staging.channel) == channel && il->band == band)
         return 0;
 
     il->staging.channel = cpu_to_le16(channel);
     if (band == NL80211_BAND_5GHZ)
         il->staging.flags &= ~RXON_FLG_BAND_24G_MSK;
     else
         il->staging.flags |= RXON_FLG_BAND_24G_MSK;
 
     il->band = band;
 
     D_INFO("Staging channel set to %d [%d]\n", channel, band);
 
     return 0;
 }
 EXPORT_SYMBOL(il_set_rxon_channel);
 
 void
 il_set_flags_for_band(struct il_priv *il, enum nl80211_band band,
               struct ieee80211_vif *vif)
 {
     if (band == NL80211_BAND_5GHZ) {
         il->staging.flags &=
             ~(RXON_FLG_BAND_24G_MSK | RXON_FLG_AUTO_DETECT_MSK |
               RXON_FLG_CCK_MSK);
         il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
     } else {
         /* Copied from il_post_associate() */
         if (vif && vif->bss_conf.use_short_slot)
             il->staging.flags |= RXON_FLG_SHORT_SLOT_MSK;
         else
             il->staging.flags &= ~RXON_FLG_SHORT_SLOT_MSK;
 
         il->staging.flags |= RXON_FLG_BAND_24G_MSK;
         il->staging.flags |= RXON_FLG_AUTO_DETECT_MSK;
         il->staging.flags &= ~RXON_FLG_CCK_MSK;
     }
 }
 EXPORT_SYMBOL(il_set_flags_for_band);
 
 /*
  * initialize rxon structure with default values from eeprom
  */
 void
 il_connection_init_rx_config(struct il_priv *il)
 {
     const struct il_channel_info *ch_info;
 
     memset(&il->staging, 0, sizeof(il->staging));
 
     switch (il->iw_mode) {
     case NL80211_IFTYPE_UNSPECIFIED:
         il->staging.dev_type = RXON_DEV_TYPE_ESS;
         break;
     case NL80211_IFTYPE_STATION:
         il->staging.dev_type = RXON_DEV_TYPE_ESS;
         il->staging.filter_flags = RXON_FILTER_ACCEPT_GRP_MSK;
         break;
     case NL80211_IFTYPE_ADHOC:
         il->staging.dev_type = RXON_DEV_TYPE_IBSS;
         il->staging.flags = RXON_FLG_SHORT_PREAMBLE_MSK;
         il->staging.filter_flags =
             RXON_FILTER_BCON_AWARE_MSK | RXON_FILTER_ACCEPT_GRP_MSK;
         break;
     default:
         IL_ERR("Unsupported interface type %d\n", il->vif->type);
         return;
     }
 
 #if 0
     /* TODO:  Figure out when short_preamble would be set and cache from
      * that */
     if (!hw_to_local(il->hw)->short_preamble)
         il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
     else
         il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
 #endif
 
     ch_info =
         il_get_channel_info(il, il->band, le16_to_cpu(il->active.channel));
 
     if (!ch_info)
         ch_info = &il->channel_info[0];
 
     il->staging.channel = cpu_to_le16(ch_info->channel);
     il->band = ch_info->band;
 
     il_set_flags_for_band(il, il->band, il->vif);
 
     il->staging.ofdm_basic_rates =
         (IL_OFDM_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
     il->staging.cck_basic_rates =
         (IL_CCK_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
 
     /* clear both MIX and PURE40 mode flag */
     il->staging.flags &=
         ~(RXON_FLG_CHANNEL_MODE_MIXED | RXON_FLG_CHANNEL_MODE_PURE_40);
     if (il->vif)
         memcpy(il->staging.node_addr, il->vif->addr, ETH_ALEN);
 
     il->staging.ofdm_ht_single_stream_basic_rates = 0xff;
     il->staging.ofdm_ht_dual_stream_basic_rates = 0xff;
 }
 EXPORT_SYMBOL(il_connection_init_rx_config);
 
 void
 il_set_rate(struct il_priv *il)
 {
     const struct ieee80211_supported_band *hw = NULL;
     struct ieee80211_rate *rate;
     int i;
 
     hw = il_get_hw_mode(il, il->band);
     if (!hw) {
         IL_ERR("Failed to set rate: unable to get hw mode\n");
         return;
     }
 
     il->active_rate = 0;
 
     for (i = 0; i < hw->n_bitrates; i++) {
         rate = &(hw->bitrates[i]);
         if (rate->hw_value < RATE_COUNT_LEGACY)
             il->active_rate |= (1 << rate->hw_value);
     }
 
     D_RATE("Set active_rate = %0x\n", il->active_rate);
 
     il->staging.cck_basic_rates =
         (IL_CCK_BASIC_RATES_MASK >> IL_FIRST_CCK_RATE) & 0xF;
 
     il->staging.ofdm_basic_rates =
         (IL_OFDM_BASIC_RATES_MASK >> IL_FIRST_OFDM_RATE) & 0xFF;
 }
 EXPORT_SYMBOL(il_set_rate);
 
 void
 il_chswitch_done(struct il_priv *il, bool is_success)
 {
     if (test_bit(S_EXIT_PENDING, &il->status))
         return;
 
     if (test_and_clear_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
         ieee80211_chswitch_done(il->vif, is_success);
 }
 EXPORT_SYMBOL(il_chswitch_done);
 
 void
 il_hdl_csa(struct il_priv *il, struct il_rx_buf *rxb)
 {
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_csa_notification *csa = &(pkt->u.csa_notif);
     struct il_rxon_cmd *rxon = (void *)&il->active;
 
     if (!test_bit(S_CHANNEL_SWITCH_PENDING, &il->status))
         return;
 
     if (!le32_to_cpu(csa->status) && csa->channel == il->switch_channel) {
         rxon->channel = csa->channel;
         il->staging.channel = csa->channel;
         D_11H("CSA notif: channel %d\n", le16_to_cpu(csa->channel));
         il_chswitch_done(il, true);
     } else {
         IL_ERR("CSA notif (fail) : channel %d\n",
                le16_to_cpu(csa->channel));
         il_chswitch_done(il, false);
     }
 }
 EXPORT_SYMBOL(il_hdl_csa);
 
 #ifdef CONFIG_IWLEGACY_DEBUG
 void
 il_print_rx_config_cmd(struct il_priv *il)
 {
     struct il_rxon_cmd *rxon = &il->staging;
 
     D_RADIO("RX CONFIG:\n");
     il_print_hex_dump(il, IL_DL_RADIO, (u8 *) rxon, sizeof(*rxon));
     D_RADIO("u16 channel: 0x%x\n", le16_to_cpu(rxon->channel));
     D_RADIO("u32 flags: 0x%08X\n", le32_to_cpu(rxon->flags));
     D_RADIO("u32 filter_flags: 0x%08x\n", le32_to_cpu(rxon->filter_flags));
     D_RADIO("u8 dev_type: 0x%x\n", rxon->dev_type);
     D_RADIO("u8 ofdm_basic_rates: 0x%02x\n", rxon->ofdm_basic_rates);
     D_RADIO("u8 cck_basic_rates: 0x%02x\n", rxon->cck_basic_rates);
     D_RADIO("u8[6] node_addr: %pM\n", rxon->node_addr);
     D_RADIO("u8[6] bssid_addr: %pM\n", rxon->bssid_addr);
     D_RADIO("u16 assoc_id: 0x%x\n", le16_to_cpu(rxon->assoc_id));
 }
 EXPORT_SYMBOL(il_print_rx_config_cmd);
 #endif
 /*
  * il_irq_handle_error - called for HW or SW error interrupt from card
  */
 void
 il_irq_handle_error(struct il_priv *il)
 {
     /* Set the FW error flag -- cleared on il_down */
     set_bit(S_FW_ERROR, &il->status);
 
     /* Cancel currently queued command. */
     clear_bit(S_HCMD_ACTIVE, &il->status);
 
     IL_ERR("Loaded firmware version: %s\n", il->hw->wiphy->fw_version);
 
     il->ops->dump_nic_error_log(il);
     if (il->ops->dump_fh)
         il->ops->dump_fh(il, NULL, false);
 #ifdef CONFIG_IWLEGACY_DEBUG
     if (il_get_debug_level(il) & IL_DL_FW_ERRORS)
         il_print_rx_config_cmd(il);
 #endif
 
     wake_up(&il->wait_command_queue);
 
     /* Keep the restart process from trying to send host
      * commands by clearing the INIT status bit */
     clear_bit(S_READY, &il->status);
 
     if (!test_bit(S_EXIT_PENDING, &il->status)) {
         IL_DBG(IL_DL_FW_ERRORS,
                "Restarting adapter due to uCode error.\n");
 
         if (il->cfg->mod_params->restart_fw)
             queue_work(il->workqueue, &il->restart);
     }
 }
 EXPORT_SYMBOL(il_irq_handle_error);
 
 static int
 _il_apm_stop_master(struct il_priv *il)
 {
     int ret = 0;
 
     /* stop device's busmaster DMA activity */
     _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_STOP_MASTER);
 
     ret =
         _il_poll_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_MASTER_DISABLED,
              CSR_RESET_REG_FLAG_MASTER_DISABLED, 100);
     if (ret < 0)
         IL_WARN("Master Disable Timed Out, 100 usec\n");
 
     D_INFO("stop master\n");
 
     return ret;
 }
 
 void
 _il_apm_stop(struct il_priv *il)
 {
     lockdep_assert_held(&il->reg_lock);
 
     D_INFO("Stop card, put in low power state\n");
 
     /* Stop device's DMA activity */
     _il_apm_stop_master(il);
 
     /* Reset the entire device */
     _il_set_bit(il, CSR_RESET, CSR_RESET_REG_FLAG_SW_RESET);
 
     udelay(10);
 
     /*
      * Clear "initialization complete" bit to move adapter from
      * D0A* (powered-up Active) --> D0U* (Uninitialized) state.
      */
     _il_clear_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 }
 EXPORT_SYMBOL(_il_apm_stop);
 
 void
 il_apm_stop(struct il_priv *il)
 {
     unsigned long flags;
 
     spin_lock_irqsave(&il->reg_lock, flags);
     _il_apm_stop(il);
     spin_unlock_irqrestore(&il->reg_lock, flags);
 }
 EXPORT_SYMBOL(il_apm_stop);
 
 /*
  * Start up NIC's basic functionality after it has been reset
  * (e.g. after platform boot, or shutdown via il_apm_stop())
  * NOTE:  This does not load uCode nor start the embedded processor
  */
 int
 il_apm_init(struct il_priv *il)
 {
     int ret = 0;
     u16 lctl;
 
     D_INFO("Init card's basic functions\n");
 
     /*
      * Use "set_bit" below rather than "write", to preserve any hardware
      * bits already set by default after reset.
      */
 
     /* Disable L0S exit timer (platform NMI Work/Around) */
     il_set_bit(il, CSR_GIO_CHICKEN_BITS,
            CSR_GIO_CHICKEN_BITS_REG_BIT_DIS_L0S_EXIT_TIMER);
 
     /*
      * Disable L0s without affecting L1;
      *  don't wait for ICH L0s (ICH bug W/A)
      */
     il_set_bit(il, CSR_GIO_CHICKEN_BITS,
            CSR_GIO_CHICKEN_BITS_REG_BIT_L1A_NO_L0S_RX);
 
     /* Set FH wait threshold to maximum (HW error during stress W/A) */
     il_set_bit(il, CSR_DBG_HPET_MEM_REG, CSR_DBG_HPET_MEM_REG_VAL);
 
     /*
      * Enable HAP INTA (interrupt from management bus) to
      * wake device's PCI Express link L1a -> L0s
      * NOTE:  This is no-op for 3945 (non-existent bit)
      */
     il_set_bit(il, CSR_HW_IF_CONFIG_REG,
            CSR_HW_IF_CONFIG_REG_BIT_HAP_WAKE_L1A);
 
     /*
      * HW bug W/A for instability in PCIe bus L0->L0S->L1 transition.
      * Check if BIOS (or OS) enabled L1-ASPM on this device.
      * If so (likely), disable L0S, so device moves directly L0->L1;
      *    costs negligible amount of power savings.
      * If not (unlikely), enable L0S, so there is at least some
      *    power savings, even without L1.
      */
     if (il->cfg->set_l0s) {
         ret = pcie_capability_read_word(il->pci_dev, PCI_EXP_LNKCTL, &lctl);
         if (!ret && (lctl & PCI_EXP_LNKCTL_ASPM_L1)) {
             /* L1-ASPM enabled; disable(!) L0S  */
             il_set_bit(il, CSR_GIO_REG,
                    CSR_GIO_REG_VAL_L0S_ENABLED);
             D_POWER("L1 Enabled; Disabling L0S\n");
         } else {
             /* L1-ASPM disabled; enable(!) L0S */
             il_clear_bit(il, CSR_GIO_REG,
                      CSR_GIO_REG_VAL_L0S_ENABLED);
             D_POWER("L1 Disabled; Enabling L0S\n");
         }
     }
 
     /* Configure analog phase-lock-loop before activating to D0A */
     if (il->cfg->pll_cfg_val)
         il_set_bit(il, CSR_ANA_PLL_CFG,
                il->cfg->pll_cfg_val);
 
     /*
      * Set "initialization complete" bit to move adapter from
      * D0U* --> D0A* (powered-up active) state.
      */
     il_set_bit(il, CSR_GP_CNTRL, CSR_GP_CNTRL_REG_FLAG_INIT_DONE);
 
     /*
      * Wait for clock stabilization; once stabilized, access to
      * device-internal resources is supported, e.g. il_wr_prph()
      * and accesses to uCode SRAM.
      */
     ret =
         _il_poll_bit(il, CSR_GP_CNTRL,
              CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY,
              CSR_GP_CNTRL_REG_FLAG_MAC_CLOCK_READY, 25000);
     if (ret < 0) {
         D_INFO("Failed to init the card\n");
         goto out;
     }
 
     /*
      * Enable DMA and BSM (if used) clocks, wait for them to stabilize.
      * BSM (Boostrap State Machine) is only in 3945 and 4965.
      *
      * Write to "CLK_EN_REG"; "1" bits enable clocks, while "0" bits
      * do not disable clocks.  This preserves any hardware bits already
      * set by default in "CLK_CTRL_REG" after reset.
      */
     if (il->cfg->use_bsm)
         il_wr_prph(il, APMG_CLK_EN_REG,
                APMG_CLK_VAL_DMA_CLK_RQT | APMG_CLK_VAL_BSM_CLK_RQT);
     else
         il_wr_prph(il, APMG_CLK_EN_REG, APMG_CLK_VAL_DMA_CLK_RQT);
     udelay(20);
 
     /* Disable L1-Active */
     il_set_bits_prph(il, APMG_PCIDEV_STT_REG,
              APMG_PCIDEV_STT_VAL_L1_ACT_DIS);
 
 out:
     return ret;
 }
 EXPORT_SYMBOL(il_apm_init);
 
 int
 il_set_tx_power(struct il_priv *il, s8 tx_power, bool force)
 {
     int ret;
     s8 prev_tx_power;
     bool defer;
 
     lockdep_assert_held(&il->mutex);
 
     if (il->tx_power_user_lmt == tx_power && !force)
         return 0;
 
     if (!il->ops->send_tx_power)
         return -EOPNOTSUPP;
 
     /* 0 dBm mean 1 milliwatt */
     if (tx_power < 0) {
         IL_WARN("Requested user TXPOWER %d below 1 mW.\n", tx_power);
         return -EINVAL;
     }
 
     if (tx_power > il->tx_power_device_lmt) {
         IL_WARN("Requested user TXPOWER %d above upper limit %d.\n",
             tx_power, il->tx_power_device_lmt);
         return -EINVAL;
     }
 
     if (!il_is_ready_rf(il))
         return -EIO;
 
     /* scan complete and commit_rxon use tx_power_next value,
      * it always need to be updated for newest request */
     il->tx_power_next = tx_power;
 
     /* do not set tx power when scanning or channel changing */
     defer = test_bit(S_SCANNING, &il->status) ||
         memcmp(&il->active, &il->staging, sizeof(il->staging));
     if (defer && !force) {
         D_INFO("Deferring tx power set\n");
         return 0;
     }
 
     prev_tx_power = il->tx_power_user_lmt;
     il->tx_power_user_lmt = tx_power;
 
     ret = il->ops->send_tx_power(il);
 
     /* if fail to set tx_power, restore the orig. tx power */
     if (ret) {
         il->tx_power_user_lmt = prev_tx_power;
         il->tx_power_next = prev_tx_power;
     }
     return ret;
 }
 EXPORT_SYMBOL(il_set_tx_power);
 
 void
 il_send_bt_config(struct il_priv *il)
 {
     struct il_bt_cmd bt_cmd = {
         .lead_time = BT_LEAD_TIME_DEF,
         .max_kill = BT_MAX_KILL_DEF,
         .kill_ack_mask = 0,
         .kill_cts_mask = 0,
     };
 
     if (!bt_coex_active)
         bt_cmd.flags = BT_COEX_DISABLE;
     else
         bt_cmd.flags = BT_COEX_ENABLE;
 
     D_INFO("BT coex %s\n",
            (bt_cmd.flags == BT_COEX_DISABLE) ? "disable" : "active");
 
     if (il_send_cmd_pdu(il, C_BT_CONFIG, sizeof(struct il_bt_cmd), &bt_cmd))
         IL_ERR("failed to send BT Coex Config\n");
 }
 EXPORT_SYMBOL(il_send_bt_config);
 
 int
 il_send_stats_request(struct il_priv *il, u8 flags, bool clear)
 {
     struct il_stats_cmd stats_cmd = {
         .configuration_flags = clear ? IL_STATS_CONF_CLEAR_STATS : 0,
     };
 
     if (flags & CMD_ASYNC)
         return il_send_cmd_pdu_async(il, C_STATS, sizeof(struct il_stats_cmd),
                          &stats_cmd, NULL);
     else
         return il_send_cmd_pdu(il, C_STATS, sizeof(struct il_stats_cmd),
                        &stats_cmd);
 }
 EXPORT_SYMBOL(il_send_stats_request);
 
 void
 il_hdl_pm_sleep(struct il_priv *il, struct il_rx_buf *rxb)
 {
 #ifdef CONFIG_IWLEGACY_DEBUG
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     struct il_sleep_notification *sleep = &(pkt->u.sleep_notif);
     D_RX("sleep mode: %d, src: %d\n",
          sleep->pm_sleep_mode, sleep->pm_wakeup_src);
 #endif
 }
 EXPORT_SYMBOL(il_hdl_pm_sleep);
 
 void
 il_hdl_pm_debug_stats(struct il_priv *il, struct il_rx_buf *rxb)
 {
     struct il_rx_pkt *pkt = rxb_addr(rxb);
     u32 len = le32_to_cpu(pkt->len_n_flags) & IL_RX_FRAME_SIZE_MSK;
     D_RADIO("Dumping %d bytes of unhandled notification for %s:\n", len,
         il_get_cmd_string(pkt->hdr.cmd));
     il_print_hex_dump(il, IL_DL_RADIO, pkt->u.raw, len);
 }
 EXPORT_SYMBOL(il_hdl_pm_debug_stats);
 
 void
 il_hdl_error(struct il_priv *il, struct il_rx_buf *rxb)
 {
     struct il_rx_pkt *pkt = rxb_addr(rxb);
 
     IL_ERR("Error Reply type 0x%08X cmd %s (0x%02X) "
            "seq 0x%04X ser 0x%08X\n",
            le32_to_cpu(pkt->u.err_resp.error_type),
            il_get_cmd_string(pkt->u.err_resp.cmd_id),
            pkt->u.err_resp.cmd_id,
            le16_to_cpu(pkt->u.err_resp.bad_cmd_seq_num),
            le32_to_cpu(pkt->u.err_resp.error_info));
 }
 EXPORT_SYMBOL(il_hdl_error);
 
 void
 il_clear_isr_stats(struct il_priv *il)
 {
     memset(&il->isr_stats, 0, sizeof(il->isr_stats));
 }
 
 int
 il_mac_conf_tx(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
            unsigned int link_id, u16 queue,
            const struct ieee80211_tx_queue_params *params)
 {
     struct il_priv *il = hw->priv;
     unsigned long flags;
     int q;
 
     D_MAC80211("enter\n");
 
     if (!il_is_ready_rf(il)) {
         D_MAC80211("leave - RF not ready\n");
         return -EIO;
     }
 
     if (queue >= AC_NUM) {
         D_MAC80211("leave - queue >= AC_NUM %d\n", queue);
         return 0;
     }
 
     q = AC_NUM - 1 - queue;
 
     spin_lock_irqsave(&il->lock, flags);
 
     il->qos_data.def_qos_parm.ac[q].cw_min =
         cpu_to_le16(params->cw_min);
     il->qos_data.def_qos_parm.ac[q].cw_max =
         cpu_to_le16(params->cw_max);
     il->qos_data.def_qos_parm.ac[q].aifsn = params->aifs;
     il->qos_data.def_qos_parm.ac[q].edca_txop =
         cpu_to_le16((params->txop * 32));
 
     il->qos_data.def_qos_parm.ac[q].reserved1 = 0;
 
     spin_unlock_irqrestore(&il->lock, flags);
 
     D_MAC80211("leave\n");
     return 0;
 }
 EXPORT_SYMBOL(il_mac_conf_tx);
 
 int
 il_mac_tx_last_beacon(struct ieee80211_hw *hw)
 {
     struct il_priv *il = hw->priv;
     int ret;
 
     D_MAC80211("enter\n");
 
     ret = (il->ibss_manager == IL_IBSS_MANAGER);
 
     D_MAC80211("leave ret %d\n", ret);
     return ret;
 }
 EXPORT_SYMBOL_GPL(il_mac_tx_last_beacon);
 
 static int
 il_set_mode(struct il_priv *il)
 {
     il_connection_init_rx_config(il);
 
     if (il->ops->set_rxon_chain)
         il->ops->set_rxon_chain(il);
 
     return il_commit_rxon(il);
 }
 
 int
 il_mac_add_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
     struct il_priv *il = hw->priv;
     int err;
     bool reset;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
 
     if (!il_is_ready_rf(il)) {
         IL_WARN("Try to add interface when device not ready\n");
         err = -EINVAL;
         goto out;
     }
 
     /*
      * We do not support multiple virtual interfaces, but on hardware reset
      * we have to add the same interface again.
      */
     reset = (il->vif == vif);
     if (il->vif && !reset) {
         err = -EOPNOTSUPP;
         goto out;
     }
 
     il->vif = vif;
     il->iw_mode = vif->type;
 
     err = il_set_mode(il);
     if (err) {
         IL_WARN("Fail to set mode %d\n", vif->type);
         if (!reset) {
             il->vif = NULL;
             il->iw_mode = NL80211_IFTYPE_STATION;
         }
     }
 
 out:
     D_MAC80211("leave err %d\n", err);
     mutex_unlock(&il->mutex);
 
     return err;
 }
 EXPORT_SYMBOL(il_mac_add_interface);
 
 static void
 il_teardown_interface(struct il_priv *il, struct ieee80211_vif *vif)
 {
     lockdep_assert_held(&il->mutex);
 
     if (il->scan_vif == vif) {
         il_scan_cancel_timeout(il, 200);
         il_force_scan_end(il);
     }
 
     il_set_mode(il);
 }
 
 void
 il_mac_remove_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
     struct il_priv *il = hw->priv;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
 
     WARN_ON(il->vif != vif);
     il->vif = NULL;
     il->iw_mode = NL80211_IFTYPE_UNSPECIFIED;
     il_teardown_interface(il, vif);
     eth_zero_addr(il->bssid);
 
     D_MAC80211("leave\n");
     mutex_unlock(&il->mutex);
 }
 EXPORT_SYMBOL(il_mac_remove_interface);
 
 int
 il_alloc_txq_mem(struct il_priv *il)
 {
     if (!il->txq)
         il->txq =
             kcalloc(il->cfg->num_of_queues,
                 sizeof(struct il_tx_queue),
                 GFP_KERNEL);
     if (!il->txq) {
         IL_ERR("Not enough memory for txq\n");
         return -ENOMEM;
     }
     return 0;
 }
 EXPORT_SYMBOL(il_alloc_txq_mem);
 
 void
 il_free_txq_mem(struct il_priv *il)
 {
     kfree(il->txq);
     il->txq = NULL;
 }
 EXPORT_SYMBOL(il_free_txq_mem);
 
 int
 il_force_reset(struct il_priv *il, bool external)
 {
     struct il_force_reset *force_reset;
 
     if (test_bit(S_EXIT_PENDING, &il->status))
         return -EINVAL;
 
     force_reset = &il->force_reset;
     force_reset->reset_request_count++;
     if (!external) {
         if (force_reset->last_force_reset_jiffies &&
             time_after(force_reset->last_force_reset_jiffies +
                    force_reset->reset_duration, jiffies)) {
             D_INFO("force reset rejected\n");
             force_reset->reset_reject_count++;
             return -EAGAIN;
         }
     }
     force_reset->reset_success_count++;
     force_reset->last_force_reset_jiffies = jiffies;
 
     /*
      * if the request is from external(ex: debugfs),
      * then always perform the request in regardless the module
      * parameter setting
      * if the request is from internal (uCode error or driver
      * detect failure), then fw_restart module parameter
      * need to be check before performing firmware reload
      */
 
     if (!external && !il->cfg->mod_params->restart_fw) {
         D_INFO("Cancel firmware reload based on "
                "module parameter setting\n");
         return 0;
     }
 
     IL_ERR("On demand firmware reload\n");
 
     /* Set the FW error flag -- cleared on il_down */
     set_bit(S_FW_ERROR, &il->status);
     wake_up(&il->wait_command_queue);
     /*
      * Keep the restart process from trying to send host
      * commands by clearing the INIT status bit
      */
     clear_bit(S_READY, &il->status);
     queue_work(il->workqueue, &il->restart);
 
     return 0;
 }
 EXPORT_SYMBOL(il_force_reset);
 
 int
 il_mac_change_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
             enum nl80211_iftype newtype, bool newp2p)
 {
     struct il_priv *il = hw->priv;
     int err;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter: type %d, addr %pM newtype %d newp2p %d\n",
             vif->type, vif->addr, newtype, newp2p);
 
     if (newp2p) {
         err = -EOPNOTSUPP;
         goto out;
     }
 
     if (!il->vif || !il_is_ready_rf(il)) {
         /*
          * Huh? But wait ... this can maybe happen when
          * we're in the middle of a firmware restart!
          */
         err = -EBUSY;
         goto out;
     }
 
     /* success */
     vif->type = newtype;
     vif->p2p = false;
     il->iw_mode = newtype;
     il_teardown_interface(il, vif);
     err = 0;
 
 out:
     D_MAC80211("leave err %d\n", err);
     mutex_unlock(&il->mutex);
 
     return err;
 }
 EXPORT_SYMBOL(il_mac_change_interface);
 
 void il_mac_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
           u32 queues, bool drop)
 {
     struct il_priv *il = hw->priv;
     unsigned long timeout = jiffies + msecs_to_jiffies(500);
     int i;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter\n");
 
     if (il->txq == NULL)
         goto out;
 
     for (i = 0; i < il->hw_params.max_txq_num; i++) {
         struct il_queue *q;
 
         if (i == il->cmd_queue)
             continue;
 
         q = &il->txq[i].q;
         if (q->read_ptr == q->write_ptr)
             continue;
 
         if (time_after(jiffies, timeout)) {
             IL_ERR("Failed to flush queue %d\n", q->id);
             break;
         }
 
         msleep(20);
     }
 out:
     D_MAC80211("leave\n");
     mutex_unlock(&il->mutex);
 }
 EXPORT_SYMBOL(il_mac_flush);
 
 /*
  * On every watchdog tick we check (latest) time stamp. If it does not
  * change during timeout period and queue is not empty we reset firmware.
  */
 static int
 il_check_stuck_queue(struct il_priv *il, int cnt)
 {
     struct il_tx_queue *txq = &il->txq[cnt];
     struct il_queue *q = &txq->q;
     unsigned long timeout;
     unsigned long now = jiffies;
     int ret;
 
     if (q->read_ptr == q->write_ptr) {
         txq->time_stamp = now;
         return 0;
     }
 
     timeout =
         txq->time_stamp +
         msecs_to_jiffies(il->cfg->wd_timeout);
 
     if (time_after(now, timeout)) {
         IL_ERR("Queue %d stuck for %u ms.\n", q->id,
                jiffies_to_msecs(now - txq->time_stamp));
         ret = il_force_reset(il, false);
         return (ret == -EAGAIN) ? 0 : 1;
     }
 
     return 0;
 }
 
 /*
  * Making watchdog tick be a quarter of timeout assure we will
  * discover the queue hung between timeout and 1.25*timeout
  */
 #define IL_WD_TICK(timeout) ((timeout) / 4)
 
 /*
  * Watchdog timer callback, we check each tx queue for stuck, if hung
  * we reset the firmware. If everything is fine just rearm the timer.
  */
 void
 il_bg_watchdog(struct timer_list *t)
 {
     struct il_priv *il = from_timer(il, t, watchdog);
     int cnt;
     unsigned long timeout;
 
     if (test_bit(S_EXIT_PENDING, &il->status))
         return;
 
     timeout = il->cfg->wd_timeout;
     if (timeout == 0)
         return;
 
     /* monitor and check for stuck cmd queue */
     if (il_check_stuck_queue(il, il->cmd_queue))
         return;
 
     /* monitor and check for other stuck queues */
     for (cnt = 0; cnt < il->hw_params.max_txq_num; cnt++) {
         /* skip as we already checked the command queue */
         if (cnt == il->cmd_queue)
             continue;
         if (il_check_stuck_queue(il, cnt))
             return;
     }
 
     mod_timer(&il->watchdog,
           jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
 }
 EXPORT_SYMBOL(il_bg_watchdog);
 
 void
 il_setup_watchdog(struct il_priv *il)
 {
     unsigned int timeout = il->cfg->wd_timeout;
 
     if (timeout)
         mod_timer(&il->watchdog,
               jiffies + msecs_to_jiffies(IL_WD_TICK(timeout)));
     else
         del_timer(&il->watchdog);
 }
 EXPORT_SYMBOL(il_setup_watchdog);
 
 /*
  * extended beacon time format
  * time in usec will be changed into a 32-bit value in extended:internal format
  * the extended part is the beacon counts
  * the internal part is the time in usec within one beacon interval
  */
 u32
 il_usecs_to_beacons(struct il_priv *il, u32 usec, u32 beacon_interval)
 {
     u32 quot;
     u32 rem;
     u32 interval = beacon_interval * TIME_UNIT;
 
     if (!interval || !usec)
         return 0;
 
     quot =
         (usec /
          interval) & (il_beacon_time_mask_high(il,
                            il->hw_params.
                            beacon_time_tsf_bits) >> il->
               hw_params.beacon_time_tsf_bits);
     rem =
         (usec % interval) & il_beacon_time_mask_low(il,
                             il->hw_params.
                             beacon_time_tsf_bits);
 
     return (quot << il->hw_params.beacon_time_tsf_bits) + rem;
 }
 EXPORT_SYMBOL(il_usecs_to_beacons);
 
 /* base is usually what we get from ucode with each received frame,
  * the same as HW timer counter counting down
  */
 __le32
 il_add_beacon_time(struct il_priv *il, u32 base, u32 addon,
            u32 beacon_interval)
 {
     u32 base_low = base & il_beacon_time_mask_low(il,
                               il->hw_params.
                               beacon_time_tsf_bits);
     u32 addon_low = addon & il_beacon_time_mask_low(il,
                             il->hw_params.
                             beacon_time_tsf_bits);
     u32 interval = beacon_interval * TIME_UNIT;
     u32 res = (base & il_beacon_time_mask_high(il,
                            il->hw_params.
                            beacon_time_tsf_bits)) +
         (addon & il_beacon_time_mask_high(il,
                           il->hw_params.
                           beacon_time_tsf_bits));
 
     if (base_low > addon_low)
         res += base_low - addon_low;
     else if (base_low < addon_low) {
         res += interval + base_low - addon_low;
         res += (1 << il->hw_params.beacon_time_tsf_bits);
     } else
         res += (1 << il->hw_params.beacon_time_tsf_bits);
 
     return cpu_to_le32(res);
 }
 EXPORT_SYMBOL(il_add_beacon_time);
 
 #ifdef CONFIG_PM_SLEEP
 
 static int
 il_pci_suspend(struct device *device)
 {
     struct il_priv *il = dev_get_drvdata(device);
 
     /*
      * This function is called when system goes into suspend state
      * mac80211 will call il_mac_stop() from the mac80211 suspend function
      * first but since il_mac_stop() has no knowledge of who the caller is,
      * it will not call apm_ops.stop() to stop the DMA operation.
      * Calling apm_ops.stop here to make sure we stop the DMA.
      */
     il_apm_stop(il);
 
     return 0;
 }
 
 static int
 il_pci_resume(struct device *device)
 {
     struct pci_dev *pdev = to_pci_dev(device);
     struct il_priv *il = pci_get_drvdata(pdev);
     bool hw_rfkill = false;
 
     /*
      * We disable the RETRY_TIMEOUT register (0x41) to keep
      * PCI Tx retries from interfering with C3 CPU state.
      */
     pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
 
     il_enable_interrupts(il);
 
     if (!(_il_rd(il, CSR_GP_CNTRL) & CSR_GP_CNTRL_REG_FLAG_HW_RF_KILL_SW))
         hw_rfkill = true;
 
     if (hw_rfkill)
         set_bit(S_RFKILL, &il->status);
     else
         clear_bit(S_RFKILL, &il->status);
 
     wiphy_rfkill_set_hw_state(il->hw->wiphy, hw_rfkill);
 
     return 0;
 }
 
 SIMPLE_DEV_PM_OPS(il_pm_ops, il_pci_suspend, il_pci_resume);
 EXPORT_SYMBOL(il_pm_ops);
 
 #endif /* CONFIG_PM_SLEEP */
 
 static void
 il_update_qos(struct il_priv *il)
 {
     if (test_bit(S_EXIT_PENDING, &il->status))
         return;
 
     il->qos_data.def_qos_parm.qos_flags = 0;
 
     if (il->qos_data.qos_active)
         il->qos_data.def_qos_parm.qos_flags |=
             QOS_PARAM_FLG_UPDATE_EDCA_MSK;
 
     if (il->ht.enabled)
         il->qos_data.def_qos_parm.qos_flags |= QOS_PARAM_FLG_TGN_MSK;
 
     D_QOS("send QoS cmd with Qos active=%d FLAGS=0x%X\n",
           il->qos_data.qos_active, il->qos_data.def_qos_parm.qos_flags);
 
     il_send_cmd_pdu_async(il, C_QOS_PARAM, sizeof(struct il_qosparam_cmd),
                   &il->qos_data.def_qos_parm, NULL);
 }
 
 /*
  * il_mac_config - mac80211 config callback
  */
 int
 il_mac_config(struct ieee80211_hw *hw, u32 changed)
 {
     struct il_priv *il = hw->priv;
     const struct il_channel_info *ch_info;
     struct ieee80211_conf *conf = &hw->conf;
     struct ieee80211_channel *channel = conf->chandef.chan;
     struct il_ht_config *ht_conf = &il->current_ht_config;
     unsigned long flags = 0;
     int ret = 0;
     u16 ch;
     int scan_active = 0;
     bool ht_changed = false;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter: channel %d changed 0x%X\n", channel->hw_value,
            changed);
 
     if (unlikely(test_bit(S_SCANNING, &il->status))) {
         scan_active = 1;
         D_MAC80211("scan active\n");
     }
 
     if (changed &
         (IEEE80211_CONF_CHANGE_SMPS | IEEE80211_CONF_CHANGE_CHANNEL)) {
         /* mac80211 uses static for non-HT which is what we want */
         il->current_ht_config.smps = conf->smps_mode;
 
         /*
          * Recalculate chain counts.
          *
          * If monitor mode is enabled then mac80211 will
          * set up the SM PS mode to OFF if an HT channel is
          * configured.
          */
         if (il->ops->set_rxon_chain)
             il->ops->set_rxon_chain(il);
     }
 
     /* during scanning mac80211 will delay channel setting until
      * scan finish with changed = 0
      */
     if (!changed || (changed & IEEE80211_CONF_CHANGE_CHANNEL)) {
 
         if (scan_active)
             goto set_ch_out;
 
         ch = channel->hw_value;
         ch_info = il_get_channel_info(il, channel->band, ch);
         if (!il_is_channel_valid(ch_info)) {
             D_MAC80211("leave - invalid channel\n");
             ret = -EINVAL;
             goto set_ch_out;
         }
 
         if (il->iw_mode == NL80211_IFTYPE_ADHOC &&
             !il_is_channel_ibss(ch_info)) {
             D_MAC80211("leave - not IBSS channel\n");
             ret = -EINVAL;
             goto set_ch_out;
         }
 
         spin_lock_irqsave(&il->lock, flags);
 
         /* Configure HT40 channels */
         if (il->ht.enabled != conf_is_ht(conf)) {
             il->ht.enabled = conf_is_ht(conf);
             ht_changed = true;
         }
         if (il->ht.enabled) {
             if (conf_is_ht40_minus(conf)) {
                 il->ht.extension_chan_offset =
                     IEEE80211_HT_PARAM_CHA_SEC_BELOW;
                 il->ht.is_40mhz = true;
             } else if (conf_is_ht40_plus(conf)) {
                 il->ht.extension_chan_offset =
                     IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
                 il->ht.is_40mhz = true;
             } else {
                 il->ht.extension_chan_offset =
                     IEEE80211_HT_PARAM_CHA_SEC_NONE;
                 il->ht.is_40mhz = false;
             }
         } else
             il->ht.is_40mhz = false;
 
         /*
          * Default to no protection. Protection mode will
          * later be set from BSS config in il_ht_conf
          */
         il->ht.protection = IEEE80211_HT_OP_MODE_PROTECTION_NONE;
 
         /* if we are switching from ht to 2.4 clear flags
          * from any ht related info since 2.4 does not
          * support ht */
         if ((le16_to_cpu(il->staging.channel) != ch))
             il->staging.flags = 0;
 
         il_set_rxon_channel(il, channel);
         il_set_rxon_ht(il, ht_conf);
 
         il_set_flags_for_band(il, channel->band, il->vif);
 
         spin_unlock_irqrestore(&il->lock, flags);
 
         if (il->ops->update_bcast_stations)
             ret = il->ops->update_bcast_stations(il);
 
 set_ch_out:
         /* The list of supported rates and rate mask can be different
          * for each band; since the band may have changed, reset
          * the rate mask to what mac80211 lists */
         il_set_rate(il);
     }
 
     if (changed & (IEEE80211_CONF_CHANGE_PS | IEEE80211_CONF_CHANGE_IDLE)) {
         il->power_data.ps_disabled = !(conf->flags & IEEE80211_CONF_PS);
         if (!il->power_data.ps_disabled)
             IL_WARN_ONCE("Enabling power save might cause firmware crashes\n");
         ret = il_power_update_mode(il, false);
         if (ret)
             D_MAC80211("Error setting sleep level\n");
     }
 
     if (changed & IEEE80211_CONF_CHANGE_POWER) {
         D_MAC80211("TX Power old=%d new=%d\n", il->tx_power_user_lmt,
                conf->power_level);
 
         il_set_tx_power(il, conf->power_level, false);
     }
 
     if (!il_is_ready(il)) {
         D_MAC80211("leave - not ready\n");
         goto out;
     }
 
     if (scan_active)
         goto out;
 
     if (memcmp(&il->active, &il->staging, sizeof(il->staging)))
         il_commit_rxon(il);
     else
         D_INFO("Not re-sending same RXON configuration.\n");
     if (ht_changed)
         il_update_qos(il);
 
 out:
     D_MAC80211("leave ret %d\n", ret);
     mutex_unlock(&il->mutex);
 
     return ret;
 }
 EXPORT_SYMBOL(il_mac_config);
 
 void
 il_mac_reset_tsf(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
     struct il_priv *il = hw->priv;
     unsigned long flags;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter: type %d, addr %pM\n", vif->type, vif->addr);
 
     spin_lock_irqsave(&il->lock, flags);
 
     memset(&il->current_ht_config, 0, sizeof(struct il_ht_config));
 
     /* new association get rid of ibss beacon skb */
     dev_kfree_skb(il->beacon_skb);
     il->beacon_skb = NULL;
     il->timestamp = 0;
 
     spin_unlock_irqrestore(&il->lock, flags);
 
     il_scan_cancel_timeout(il, 100);
     if (!il_is_ready_rf(il)) {
         D_MAC80211("leave - not ready\n");
         mutex_unlock(&il->mutex);
         return;
     }
 
     /* we are restarting association process */
     il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
     il_commit_rxon(il);
 
     il_set_rate(il);
 
     D_MAC80211("leave\n");
     mutex_unlock(&il->mutex);
 }
 EXPORT_SYMBOL(il_mac_reset_tsf);
 
 static void
 il_ht_conf(struct il_priv *il, struct ieee80211_vif *vif)
 {
     struct il_ht_config *ht_conf = &il->current_ht_config;
     struct ieee80211_sta *sta;
     struct ieee80211_bss_conf *bss_conf = &vif->bss_conf;
 
     D_ASSOC("enter:\n");
 
     if (!il->ht.enabled)
         return;
 
     il->ht.protection =
         bss_conf->ht_operation_mode & IEEE80211_HT_OP_MODE_PROTECTION;
     il->ht.non_gf_sta_present =
         !!(bss_conf->
            ht_operation_mode & IEEE80211_HT_OP_MODE_NON_GF_STA_PRSNT);
 
     ht_conf->single_chain_sufficient = false;
 
     switch (vif->type) {
     case NL80211_IFTYPE_STATION:
         rcu_read_lock();
         sta = ieee80211_find_sta(vif, bss_conf->bssid);
         if (sta) {
             struct ieee80211_sta_ht_cap *ht_cap = &sta->deflink.ht_cap;
             int maxstreams;
 
             maxstreams =
                 (ht_cap->mcs.
                  tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
                 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT;
             maxstreams += 1;
 
             if (ht_cap->mcs.rx_mask[1] == 0 &&
                 ht_cap->mcs.rx_mask[2] == 0)
                 ht_conf->single_chain_sufficient = true;
             if (maxstreams <= 1)
                 ht_conf->single_chain_sufficient = true;
         } else {
             /*
              * If at all, this can only happen through a race
              * when the AP disconnects us while we're still
              * setting up the connection, in that case mac80211
              * will soon tell us about that.
              */
             ht_conf->single_chain_sufficient = true;
         }
         rcu_read_unlock();
         break;
     case NL80211_IFTYPE_ADHOC:
         ht_conf->single_chain_sufficient = true;
         break;
     default:
         break;
     }
 
     D_ASSOC("leave\n");
 }
 
 static inline void
 il_set_no_assoc(struct il_priv *il, struct ieee80211_vif *vif)
 {
     /*
      * inform the ucode that there is no longer an
      * association and that no more packets should be
      * sent
      */
     il->staging.filter_flags &= ~RXON_FILTER_ASSOC_MSK;
     il->staging.assoc_id = 0;
     il_commit_rxon(il);
 }
 
 static void
 il_beacon_update(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
 {
     struct il_priv *il = hw->priv;
     unsigned long flags;
     __le64 timestamp;
     struct sk_buff *skb = ieee80211_beacon_get(hw, vif, 0);
 
     if (!skb)
         return;
 
     D_MAC80211("enter\n");
 
     lockdep_assert_held(&il->mutex);
 
     if (!il->beacon_enabled) {
         IL_ERR("update beacon with no beaconing enabled\n");
         dev_kfree_skb(skb);
         return;
     }
 
     spin_lock_irqsave(&il->lock, flags);
     dev_kfree_skb(il->beacon_skb);
     il->beacon_skb = skb;
 
     timestamp = ((struct ieee80211_mgmt *)skb->data)->u.beacon.timestamp;
     il->timestamp = le64_to_cpu(timestamp);
 
     D_MAC80211("leave\n");
     spin_unlock_irqrestore(&il->lock, flags);
 
     if (!il_is_ready_rf(il)) {
         D_MAC80211("leave - RF not ready\n");
         return;
     }
 
     il->ops->post_associate(il);
 }
 
 void
 il_mac_bss_info_changed(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
             struct ieee80211_bss_conf *bss_conf, u64 changes)
 {
     struct il_priv *il = hw->priv;
     int ret;
 
     mutex_lock(&il->mutex);
     D_MAC80211("enter: changes 0x%llx\n", changes);
 
     if (!il_is_alive(il)) {
         D_MAC80211("leave - not alive\n");
         mutex_unlock(&il->mutex);
         return;
     }
 
     if (changes & BSS_CHANGED_QOS) {
         unsigned long flags;
 
         spin_lock_irqsave(&il->lock, flags);
         il->qos_data.qos_active = bss_conf->qos;
         il_update_qos(il);
         spin_unlock_irqrestore(&il->lock, flags);
     }
 
     if (changes & BSS_CHANGED_BEACON_ENABLED) {
         /* FIXME: can we remove beacon_enabled ? */
         if (vif->bss_conf.enable_beacon)
             il->beacon_enabled = true;
         else
             il->beacon_enabled = false;
     }
 
     if (changes & BSS_CHANGED_BSSID) {
         D_MAC80211("BSSID %pM\n", bss_conf->bssid);
 
         /*
          * On passive channel we wait with blocked queues to see if
          * there is traffic on that channel. If no frame will be
          * received (what is very unlikely since scan detects AP on
          * that channel, but theoretically possible), mac80211 associate
          * procedure will time out and mac80211 will call us with NULL
          * bssid. We have to unblock queues on such condition.
          */
         if (is_zero_ether_addr(bss_conf->bssid))
             il_wake_queues_by_reason(il, IL_STOP_REASON_PASSIVE);
 
         /*
          * If there is currently a HW scan going on in the background,
          * then we need to cancel it, otherwise sometimes we are not
          * able to authenticate (FIXME: why ?)
          */
         if (il_scan_cancel_timeout(il, 100)) {
             D_MAC80211("leave - scan abort failed\n");
             mutex_unlock(&il->mutex);
             return;
         }
 
         /* mac80211 only sets assoc when in STATION mode */
         memcpy(il->staging.bssid_addr, bss_conf->bssid, ETH_ALEN);
 
         /* FIXME: currently needed in a few places */
         memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
     }
 
     /*
      * This needs to be after setting the BSSID in case
      * mac80211 decides to do both changes at once because
      * it will invoke post_associate.
      */
     if (vif->type == NL80211_IFTYPE_ADHOC && (changes & BSS_CHANGED_BEACON))
         il_beacon_update(hw, vif);
 
     if (changes & BSS_CHANGED_ERP_PREAMBLE) {
         D_MAC80211("ERP_PREAMBLE %d\n", bss_conf->use_short_preamble);
         if (bss_conf->use_short_preamble)
             il->staging.flags |= RXON_FLG_SHORT_PREAMBLE_MSK;
         else
             il->staging.flags &= ~RXON_FLG_SHORT_PREAMBLE_MSK;
     }
 
     if (changes & BSS_CHANGED_ERP_CTS_PROT) {
         D_MAC80211("ERP_CTS %d\n", bss_conf->use_cts_prot);
         if (bss_conf->use_cts_prot && il->band != NL80211_BAND_5GHZ)
             il->staging.flags |= RXON_FLG_TGG_PROTECT_MSK;
         else
             il->staging.flags &= ~RXON_FLG_TGG_PROTECT_MSK;
         if (bss_conf->use_cts_prot)
             il->staging.flags |= RXON_FLG_SELF_CTS_EN;
         else
             il->staging.flags &= ~RXON_FLG_SELF_CTS_EN;
     }
 
     if (changes & BSS_CHANGED_BASIC_RATES) {
         /* XXX use this information
          *
          * To do that, remove code from il_set_rate() and put something
          * like this here:
          *
          if (A-band)
          il->staging.ofdm_basic_rates =
          bss_conf->basic_rates;
          else
          il->staging.ofdm_basic_rates =
          bss_conf->basic_rates >> 4;
          il->staging.cck_basic_rates =
          bss_conf->basic_rates & 0xF;
          */
     }
 
     if (changes & BSS_CHANGED_HT) {
         il_ht_conf(il, vif);
 
         if (il->ops->set_rxon_chain)
             il->ops->set_rxon_chain(il);
     }
 
     if (changes & BSS_CHANGED_ASSOC) {
         D_MAC80211("ASSOC %d\n", vif->cfg.assoc);
         if (vif->cfg.assoc) {
             il->timestamp = bss_conf->sync_tsf;
 
             if (!il_is_rfkill(il))
                 il->ops->post_associate(il);
         } else
             il_set_no_assoc(il, vif);
     }
 
     if (changes && il_is_associated(il) && vif->cfg.aid) {
         D_MAC80211("Changes (%#llx) while associated\n", changes);
         ret = il_send_rxon_assoc(il);
         if (!ret) {
             /* Sync active_rxon with latest change. */
             memcpy((void *)&il->active, &il->staging,
                    sizeof(struct il_rxon_cmd));
         }
     }
 
     if (changes & BSS_CHANGED_BEACON_ENABLED) {
         if (vif->bss_conf.enable_beacon) {
             memcpy(il->staging.bssid_addr, bss_conf->bssid,
                    ETH_ALEN);
             memcpy(il->bssid, bss_conf->bssid, ETH_ALEN);
             il->ops->config_ap(il);
         } else
             il_set_no_assoc(il, vif);
     }
 
     if (changes & BSS_CHANGED_IBSS) {
         ret = il->ops->manage_ibss_station(il, vif,
                            vif->cfg.ibss_joined);
         if (ret)
             IL_ERR("failed to %s IBSS station %pM\n",
                    vif->cfg.ibss_joined ? "add" : "remove",
                    bss_conf->bssid);
     }
 
     D_MAC80211("leave\n");
     mutex_unlock(&il->mutex);
 }
 EXPORT_SYMBOL(il_mac_bss_info_changed);
 
 irqreturn_t
 il_isr(int irq, void *data)
 {
     struct il_priv *il = data;
     u32 inta, inta_mask;
     u32 inta_fh;
     unsigned long flags;
     if (!il)
         return IRQ_NONE;
 
     spin_lock_irqsave(&il->lock, flags);
 
     /* Disable (but don't clear!) interrupts here to avoid
      *    back-to-back ISRs and sporadic interrupts from our NIC.
      * If we have something to service, the tasklet will re-enable ints.
      * If we *don't* have something, we'll re-enable before leaving here. */
     inta_mask = _il_rd(il, CSR_INT_MASK);   /* just for debug */
     _il_wr(il, CSR_INT_MASK, 0x00000000);
 
     /* Discover which interrupts are active/pending */
     inta = _il_rd(il, CSR_INT);
     inta_fh = _il_rd(il, CSR_FH_INT_STATUS);
 
     /* Ignore interrupt if there's nothing in NIC to service.
      * This may be due to IRQ shared with another device,
      * or due to sporadic interrupts thrown from our NIC. */
     if (!inta && !inta_fh) {
         D_ISR("Ignore interrupt, inta == 0, inta_fh == 0\n");
         goto none;
     }
 
     if (inta == 0xFFFFFFFF || (inta & 0xFFFFFFF0) == 0xa5a5a5a0) {
         /* Hardware disappeared. It might have already raised
          * an interrupt */
         IL_WARN("HARDWARE GONE?? INTA == 0x%08x\n", inta);
         goto unplugged;
     }
 
     D_ISR("ISR inta 0x%08x, enabled 0x%08x, fh 0x%08x\n", inta, inta_mask,
           inta_fh);
 
     inta &= ~CSR_INT_BIT_SCD;
 
     /* il_irq_tasklet() will service interrupts and re-enable them */
     if (likely(inta || inta_fh))
         tasklet_schedule(&il->irq_tasklet);
 
 unplugged:
     spin_unlock_irqrestore(&il->lock, flags);
     return IRQ_HANDLED;
 
 none:
     /* re-enable interrupts here since we don't have anything to service. */
     /* only Re-enable if disabled by irq */
     if (test_bit(S_INT_ENABLED, &il->status))
         il_enable_interrupts(il);
     spin_unlock_irqrestore(&il->lock, flags);
     return IRQ_NONE;
 }
 EXPORT_SYMBOL(il_isr);
 
 /*
  *  il_tx_cmd_protection: Set rts/cts. 3945 and 4965 only share this
  *  function.
  */
 void
 il_tx_cmd_protection(struct il_priv *il, struct ieee80211_tx_info *info,
              __le16 fc, __le32 *tx_flags)
 {
     if (info->control.rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS) {
         *tx_flags |= TX_CMD_FLG_RTS_MSK;
         *tx_flags &= ~TX_CMD_FLG_CTS_MSK;
         *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
 
         if (!ieee80211_is_mgmt(fc))
             return;
 
         switch (fc & cpu_to_le16(IEEE80211_FCTL_STYPE)) {
         case cpu_to_le16(IEEE80211_STYPE_AUTH):
         case cpu_to_le16(IEEE80211_STYPE_DEAUTH):
         case cpu_to_le16(IEEE80211_STYPE_ASSOC_REQ):
         case cpu_to_le16(IEEE80211_STYPE_REASSOC_REQ):
             *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
             *tx_flags |= TX_CMD_FLG_CTS_MSK;
             break;
         }
     } else if (info->control.rates[0].
            flags & IEEE80211_TX_RC_USE_CTS_PROTECT) {
         *tx_flags &= ~TX_CMD_FLG_RTS_MSK;
         *tx_flags |= TX_CMD_FLG_CTS_MSK;
         *tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
     }
 }
 EXPORT_SYMBOL(il_tx_cmd_protection);