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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

 /*
  * Copyright 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright 2007   Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2008-2011  Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright      2017  Intel Deutschland GmbH
  * Copyright (C) 2018 - 2022 Intel Corporation
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
 
 /**
  * DOC: Wireless regulatory infrastructure
  *
  * The usual implementation is for a driver to read a device EEPROM to
  * determine which regulatory domain it should be operating under, then
  * looking up the allowable channels in a driver-local table and finally
  * registering those channels in the wiphy structure.
  *
  * Another set of compliance enforcement is for drivers to use their
  * own compliance limits which can be stored on the EEPROM. The host
  * driver or firmware may ensure these are used.
  *
  * In addition to all this we provide an extra layer of regulatory
  * conformance. For drivers which do not have any regulatory
  * information CRDA provides the complete regulatory solution.
  * For others it provides a community effort on further restrictions
  * to enhance compliance.
  *
  * Note: When number of rules --> infinity we will not be able to
  * index on alpha2 any more, instead we'll probably have to
  * rely on some SHA1 checksum of the regdomain for example.
  *
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/kernel.h>
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/list.h>
 #include <linux/ctype.h>
 #include <linux/nl80211.h>
 #include <linux/platform_device.h>
 #include <linux/verification.h>
 #include <linux/moduleparam.h>
 #include <linux/firmware.h>
 #include <net/cfg80211.h>
 #include "core.h"
 #include "reg.h"
 #include "rdev-ops.h"
 #include "nl80211.h"
 
 /*
  * Grace period we give before making sure all current interfaces reside on
  * channels allowed by the current regulatory domain.
  */
 #define REG_ENFORCE_GRACE_MS 60000
 
 /**
  * enum reg_request_treatment - regulatory request treatment
  *
  * @REG_REQ_OK: continue processing the regulatory request
  * @REG_REQ_IGNORE: ignore the regulatory request
  * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
  *  be intersected with the current one.
  * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
  *  regulatory settings, and no further processing is required.
  */
 enum reg_request_treatment {
     REG_REQ_OK,
     REG_REQ_IGNORE,
     REG_REQ_INTERSECT,
     REG_REQ_ALREADY_SET,
 };
 
 static struct regulatory_request core_request_world = {
     .initiator = NL80211_REGDOM_SET_BY_CORE,
     .alpha2[0] = '0',
     .alpha2[1] = '0',
     .intersect = false,
     .processed = true,
     .country_ie_env = ENVIRON_ANY,
 };
 
 /*
  * Receipt of information from last regulatory request,
  * protected by RTNL (and can be accessed with RCU protection)
  */
 static struct regulatory_request __rcu *last_request =
     (void __force __rcu *)&core_request_world;
 
 /* To trigger userspace events and load firmware */
 static struct platform_device *reg_pdev;
 
 /*
  * Central wireless core regulatory domains, we only need two,
  * the current one and a world regulatory domain in case we have no
  * information to give us an alpha2.
  * (protected by RTNL, can be read under RCU)
  */
 const struct ieee80211_regdomain __rcu *cfg80211_regdomain;
 
 /*
  * Number of devices that registered to the core
  * that support cellular base station regulatory hints
  * (protected by RTNL)
  */
 static int reg_num_devs_support_basehint;
 
 /*
  * State variable indicating if the platform on which the devices
  * are attached is operating in an indoor environment. The state variable
  * is relevant for all registered devices.
  */
 static bool reg_is_indoor;
 static DEFINE_SPINLOCK(reg_indoor_lock);
 
 /* Used to track the userspace process controlling the indoor setting */
 static u32 reg_is_indoor_portid;
 
 static void restore_regulatory_settings(bool reset_user, bool cached);
 static void print_regdomain(const struct ieee80211_regdomain *rd);
 static void reg_process_hint(struct regulatory_request *reg_request);
 
 static const struct ieee80211_regdomain *get_cfg80211_regdom(void)
 {
     return rcu_dereference_rtnl(cfg80211_regdomain);
 }
 
 /*
  * Returns the regulatory domain associated with the wiphy.
  *
  * Requires any of RTNL, wiphy mutex or RCU protection.
  */
 const struct ieee80211_regdomain *get_wiphy_regdom(struct wiphy *wiphy)
 {
     return rcu_dereference_check(wiphy->regd,
                      lockdep_is_held(&wiphy->mtx) ||
                      lockdep_rtnl_is_held());
 }
 EXPORT_SYMBOL(get_wiphy_regdom);
 
 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region)
 {
     switch (dfs_region) {
     case NL80211_DFS_UNSET:
         return "unset";
     case NL80211_DFS_FCC:
         return "FCC";
     case NL80211_DFS_ETSI:
         return "ETSI";
     case NL80211_DFS_JP:
         return "JP";
     }
     return "Unknown";
 }
 
 enum nl80211_dfs_regions reg_get_dfs_region(struct wiphy *wiphy)
 {
     const struct ieee80211_regdomain *regd = NULL;
     const struct ieee80211_regdomain *wiphy_regd = NULL;
     enum nl80211_dfs_regions dfs_region;
 
     rcu_read_lock();
     regd = get_cfg80211_regdom();
     dfs_region = regd->dfs_region;
 
     if (!wiphy)
         goto out;
 
     wiphy_regd = get_wiphy_regdom(wiphy);
     if (!wiphy_regd)
         goto out;
 
     if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
         dfs_region = wiphy_regd->dfs_region;
         goto out;
     }
 
     if (wiphy_regd->dfs_region == regd->dfs_region)
         goto out;
 
     pr_debug("%s: device specific dfs_region (%s) disagrees with cfg80211's central dfs_region (%s)\n",
          dev_name(&wiphy->dev),
          reg_dfs_region_str(wiphy_regd->dfs_region),
          reg_dfs_region_str(regd->dfs_region));
 
 out:
     rcu_read_unlock();
 
     return dfs_region;
 }
 
 static void rcu_free_regdom(const struct ieee80211_regdomain *r)
 {
     if (!r)
         return;
     kfree_rcu((struct ieee80211_regdomain *)r, rcu_head);
 }
 
 static struct regulatory_request *get_last_request(void)
 {
     return rcu_dereference_rtnl(last_request);
 }
 
 /* Used to queue up regulatory hints */
 static LIST_HEAD(reg_requests_list);
 static DEFINE_SPINLOCK(reg_requests_lock);
 
 /* Used to queue up beacon hints for review */
 static LIST_HEAD(reg_pending_beacons);
 static DEFINE_SPINLOCK(reg_pending_beacons_lock);
 
 /* Used to keep track of processed beacon hints */
 static LIST_HEAD(reg_beacon_list);
 
 struct reg_beacon {
     struct list_head list;
     struct ieee80211_channel chan;
 };
 
 static void reg_check_chans_work(struct work_struct *work);
 static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);
 
 static void reg_todo(struct work_struct *work);
 static DECLARE_WORK(reg_work, reg_todo);
 
 /* We keep a static world regulatory domain in case of the absence of CRDA */
 static const struct ieee80211_regdomain world_regdom = {
     .n_reg_rules = 8,
     .alpha2 =  "00",
     .reg_rules = {
         /* IEEE 802.11b/g, channels 1..11 */
         REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
         /* IEEE 802.11b/g, channels 12..13. */
         REG_RULE(2467-10, 2472+10, 20, 6, 20,
             NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
         /* IEEE 802.11 channel 14 - Only JP enables
          * this and for 802.11b only */
         REG_RULE(2484-10, 2484+10, 20, 6, 20,
             NL80211_RRF_NO_IR |
             NL80211_RRF_NO_OFDM),
         /* IEEE 802.11a, channel 36..48 */
         REG_RULE(5180-10, 5240+10, 80, 6, 20,
                         NL80211_RRF_NO_IR |
                         NL80211_RRF_AUTO_BW),
 
         /* IEEE 802.11a, channel 52..64 - DFS required */
         REG_RULE(5260-10, 5320+10, 80, 6, 20,
             NL80211_RRF_NO_IR |
             NL80211_RRF_AUTO_BW |
             NL80211_RRF_DFS),
 
         /* IEEE 802.11a, channel 100..144 - DFS required */
         REG_RULE(5500-10, 5720+10, 160, 6, 20,
             NL80211_RRF_NO_IR |
             NL80211_RRF_DFS),
 
         /* IEEE 802.11a, channel 149..165 */
         REG_RULE(5745-10, 5825+10, 80, 6, 20,
             NL80211_RRF_NO_IR),
 
         /* IEEE 802.11ad (60GHz), channels 1..3 */
         REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
     }
 };
 
 /* protected by RTNL */
 static const struct ieee80211_regdomain *cfg80211_world_regdom =
     &world_regdom;
 
 static char *ieee80211_regdom = "00";
 static char user_alpha2[2];
 static const struct ieee80211_regdomain *cfg80211_user_regdom;
 
 module_param(ieee80211_regdom, charp, 0444);
 MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");
 
 static void reg_free_request(struct regulatory_request *request)
 {
     if (request == &core_request_world)
         return;
 
     if (request != get_last_request())
         kfree(request);
 }
 
 static void reg_free_last_request(void)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (lr != &core_request_world && lr)
         kfree_rcu(lr, rcu_head);
 }
 
 static void reg_update_last_request(struct regulatory_request *request)
 {
     struct regulatory_request *lr;
 
     lr = get_last_request();
     if (lr == request)
         return;
 
     reg_free_last_request();
     rcu_assign_pointer(last_request, request);
 }
 
 static void reset_regdomains(bool full_reset,
                  const struct ieee80211_regdomain *new_regdom)
 {
     const struct ieee80211_regdomain *r;
 
     ASSERT_RTNL();
 
     r = get_cfg80211_regdom();
 
     /* avoid freeing static information or freeing something twice */
     if (r == cfg80211_world_regdom)
         r = NULL;
     if (cfg80211_world_regdom == &world_regdom)
         cfg80211_world_regdom = NULL;
     if (r == &world_regdom)
         r = NULL;
 
     rcu_free_regdom(r);
     rcu_free_regdom(cfg80211_world_regdom);
 
     cfg80211_world_regdom = &world_regdom;
     rcu_assign_pointer(cfg80211_regdomain, new_regdom);
 
     if (!full_reset)
         return;
 
     reg_update_last_request(&core_request_world);
 }
 
 /*
  * Dynamic world regulatory domain requested by the wireless
  * core upon initialization
  */
 static void update_world_regdomain(const struct ieee80211_regdomain *rd)
 {
     struct regulatory_request *lr;
 
     lr = get_last_request();
 
     WARN_ON(!lr);
 
     reset_regdomains(false, rd);
 
     cfg80211_world_regdom = rd;
 }
 
 bool is_world_regdom(const char *alpha2)
 {
     if (!alpha2)
         return false;
     return alpha2[0] == '0' && alpha2[1] == '0';
 }
 
 static bool is_alpha2_set(const char *alpha2)
 {
     if (!alpha2)
         return false;
     return alpha2[0] && alpha2[1];
 }
 
 static bool is_unknown_alpha2(const char *alpha2)
 {
     if (!alpha2)
         return false;
     /*
      * Special case where regulatory domain was built by driver
      * but a specific alpha2 cannot be determined
      */
     return alpha2[0] == '9' && alpha2[1] == '9';
 }
 
 static bool is_intersected_alpha2(const char *alpha2)
 {
     if (!alpha2)
         return false;
     /*
      * Special case where regulatory domain is the
      * result of an intersection between two regulatory domain
      * structures
      */
     return alpha2[0] == '9' && alpha2[1] == '8';
 }
 
 static bool is_an_alpha2(const char *alpha2)
 {
     if (!alpha2)
         return false;
     return isalpha(alpha2[0]) && isalpha(alpha2[1]);
 }
 
 static bool alpha2_equal(const char *alpha2_x, const char *alpha2_y)
 {
     if (!alpha2_x || !alpha2_y)
         return false;
     return alpha2_x[0] == alpha2_y[0] && alpha2_x[1] == alpha2_y[1];
 }
 
 static bool regdom_changes(const char *alpha2)
 {
     const struct ieee80211_regdomain *r = get_cfg80211_regdom();
 
     if (!r)
         return true;
     return !alpha2_equal(r->alpha2, alpha2);
 }
 
 /*
  * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
  * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
  * has ever been issued.
  */
 static bool is_user_regdom_saved(void)
 {
     if (user_alpha2[0] == '9' && user_alpha2[1] == '7')
         return false;
 
     /* This would indicate a mistake on the design */
     if (WARN(!is_world_regdom(user_alpha2) && !is_an_alpha2(user_alpha2),
          "Unexpected user alpha2: %c%c\n",
          user_alpha2[0], user_alpha2[1]))
         return false;
 
     return true;
 }
 
 static const struct ieee80211_regdomain *
 reg_copy_regd(const struct ieee80211_regdomain *src_regd)
 {
     struct ieee80211_regdomain *regd;
     unsigned int i;
 
     regd = kzalloc(struct_size(regd, reg_rules, src_regd->n_reg_rules),
                GFP_KERNEL);
     if (!regd)
         return ERR_PTR(-ENOMEM);
 
     memcpy(regd, src_regd, sizeof(struct ieee80211_regdomain));
 
     for (i = 0; i < src_regd->n_reg_rules; i++)
         memcpy(&regd->reg_rules[i], &src_regd->reg_rules[i],
                sizeof(struct ieee80211_reg_rule));
 
     return regd;
 }
 
 static void cfg80211_save_user_regdom(const struct ieee80211_regdomain *rd)
 {
     ASSERT_RTNL();
 
     if (!IS_ERR(cfg80211_user_regdom))
         kfree(cfg80211_user_regdom);
     cfg80211_user_regdom = reg_copy_regd(rd);
 }
 
 struct reg_regdb_apply_request {
     struct list_head list;
     const struct ieee80211_regdomain *regdom;
 };
 
 static LIST_HEAD(reg_regdb_apply_list);
 static DEFINE_MUTEX(reg_regdb_apply_mutex);
 
 static void reg_regdb_apply(struct work_struct *work)
 {
     struct reg_regdb_apply_request *request;
 
     rtnl_lock();
 
     mutex_lock(&reg_regdb_apply_mutex);
     while (!list_empty(&reg_regdb_apply_list)) {
         request = list_first_entry(&reg_regdb_apply_list,
                        struct reg_regdb_apply_request,
                        list);
         list_del(&request->list);
 
         set_regdom(request->regdom, REGD_SOURCE_INTERNAL_DB);
         kfree(request);
     }
     mutex_unlock(&reg_regdb_apply_mutex);
 
     rtnl_unlock();
 }
 
 static DECLARE_WORK(reg_regdb_work, reg_regdb_apply);
 
 static int reg_schedule_apply(const struct ieee80211_regdomain *regdom)
 {
     struct reg_regdb_apply_request *request;
 
     request = kzalloc(sizeof(struct reg_regdb_apply_request), GFP_KERNEL);
     if (!request) {
         kfree(regdom);
         return -ENOMEM;
     }
 
     request->regdom = regdom;
 
     mutex_lock(&reg_regdb_apply_mutex);
     list_add_tail(&request->list, &reg_regdb_apply_list);
     mutex_unlock(&reg_regdb_apply_mutex);
 
     schedule_work(&reg_regdb_work);
     return 0;
 }
 
 #ifdef CONFIG_CFG80211_CRDA_SUPPORT
 /* Max number of consecutive attempts to communicate with CRDA  */
 #define REG_MAX_CRDA_TIMEOUTS 10
 
 static u32 reg_crda_timeouts;
 
 static void crda_timeout_work(struct work_struct *work);
 static DECLARE_DELAYED_WORK(crda_timeout, crda_timeout_work);
 
 static void crda_timeout_work(struct work_struct *work)
 {
     pr_debug("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
     rtnl_lock();
     reg_crda_timeouts++;
     restore_regulatory_settings(true, false);
     rtnl_unlock();
 }
 
 static void cancel_crda_timeout(void)
 {
     cancel_delayed_work(&crda_timeout);
 }
 
 static void cancel_crda_timeout_sync(void)
 {
     cancel_delayed_work_sync(&crda_timeout);
 }
 
 static void reset_crda_timeouts(void)
 {
     reg_crda_timeouts = 0;
 }
 
 /*
  * This lets us keep regulatory code which is updated on a regulatory
  * basis in userspace.
  */
 static int call_crda(const char *alpha2)
 {
     char country[12];
     char *env[] = { country, NULL };
     int ret;
 
     snprintf(country, sizeof(country), "COUNTRY=%c%c",
          alpha2[0], alpha2[1]);
 
     if (reg_crda_timeouts > REG_MAX_CRDA_TIMEOUTS) {
         pr_debug("Exceeded CRDA call max attempts. Not calling CRDA\n");
         return -EINVAL;
     }
 
     if (!is_world_regdom((char *) alpha2))
         pr_debug("Calling CRDA for country: %c%c\n",
              alpha2[0], alpha2[1]);
     else
         pr_debug("Calling CRDA to update world regulatory domain\n");
 
     ret = kobject_uevent_env(&reg_pdev->dev.kobj, KOBJ_CHANGE, env);
     if (ret)
         return ret;
 
     queue_delayed_work(system_power_efficient_wq,
                &crda_timeout, msecs_to_jiffies(3142));
     return 0;
 }
 #else
 static inline void cancel_crda_timeout(void) {}
 static inline void cancel_crda_timeout_sync(void) {}
 static inline void reset_crda_timeouts(void) {}
 static inline int call_crda(const char *alpha2)
 {
     return -ENODATA;
 }
 #endif /* CONFIG_CFG80211_CRDA_SUPPORT */
 
 /* code to directly load a firmware database through request_firmware */
 static const struct fwdb_header *regdb;
 
 struct fwdb_country {
     u8 alpha2[2];
     __be16 coll_ptr;
     /* this struct cannot be extended */
 } __packed __aligned(4);
 
 struct fwdb_collection {
     u8 len;
     u8 n_rules;
     u8 dfs_region;
     /* no optional data yet */
     /* aligned to 2, then followed by __be16 array of rule pointers */
 } __packed __aligned(4);
 
 enum fwdb_flags {
     FWDB_FLAG_NO_OFDM   = BIT(0),
     FWDB_FLAG_NO_OUTDOOR    = BIT(1),
     FWDB_FLAG_DFS       = BIT(2),
     FWDB_FLAG_NO_IR     = BIT(3),
     FWDB_FLAG_AUTO_BW   = BIT(4),
 };
 
 struct fwdb_wmm_ac {
     u8 ecw;
     u8 aifsn;
     __be16 cot;
 } __packed;
 
 struct fwdb_wmm_rule {
     struct fwdb_wmm_ac client[IEEE80211_NUM_ACS];
     struct fwdb_wmm_ac ap[IEEE80211_NUM_ACS];
 } __packed;
 
 struct fwdb_rule {
     u8 len;
     u8 flags;
     __be16 max_eirp;
     __be32 start, end, max_bw;
     /* start of optional data */
     __be16 cac_timeout;
     __be16 wmm_ptr;
 } __packed __aligned(4);
 
 #define FWDB_MAGIC 0x52474442
 #define FWDB_VERSION 20
 
 struct fwdb_header {
     __be32 magic;
     __be32 version;
     struct fwdb_country country[];
 } __packed __aligned(4);
 
 static int ecw2cw(int ecw)
 {
     return (1 << ecw) - 1;
 }
 
 static bool valid_wmm(struct fwdb_wmm_rule *rule)
 {
     struct fwdb_wmm_ac *ac = (struct fwdb_wmm_ac *)rule;
     int i;
 
     for (i = 0; i < IEEE80211_NUM_ACS * 2; i++) {
         u16 cw_min = ecw2cw((ac[i].ecw & 0xf0) >> 4);
         u16 cw_max = ecw2cw(ac[i].ecw & 0x0f);
         u8 aifsn = ac[i].aifsn;
 
         if (cw_min >= cw_max)
             return false;
 
         if (aifsn < 1)
             return false;
     }
 
     return true;
 }
 
 static bool valid_rule(const u8 *data, unsigned int size, u16 rule_ptr)
 {
     struct fwdb_rule *rule = (void *)(data + (rule_ptr << 2));
 
     if ((u8 *)rule + sizeof(rule->len) > data + size)
         return false;
 
     /* mandatory fields */
     if (rule->len < offsetofend(struct fwdb_rule, max_bw))
         return false;
     if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr)) {
         u32 wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
         struct fwdb_wmm_rule *wmm;
 
         if (wmm_ptr + sizeof(struct fwdb_wmm_rule) > size)
             return false;
 
         wmm = (void *)(data + wmm_ptr);
 
         if (!valid_wmm(wmm))
             return false;
     }
     return true;
 }
 
 static bool valid_country(const u8 *data, unsigned int size,
               const struct fwdb_country *country)
 {
     unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
     struct fwdb_collection *coll = (void *)(data + ptr);
     __be16 *rules_ptr;
     unsigned int i;
 
     /* make sure we can read len/n_rules */
     if ((u8 *)coll + offsetofend(typeof(*coll), n_rules) > data + size)
         return false;
 
     /* make sure base struct and all rules fit */
     if ((u8 *)coll + ALIGN(coll->len, 2) +
         (coll->n_rules * 2) > data + size)
         return false;
 
     /* mandatory fields must exist */
     if (coll->len < offsetofend(struct fwdb_collection, dfs_region))
         return false;
 
     rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
 
     for (i = 0; i < coll->n_rules; i++) {
         u16 rule_ptr = be16_to_cpu(rules_ptr[i]);
 
         if (!valid_rule(data, size, rule_ptr))
             return false;
     }
 
     return true;
 }
 
 #ifdef CONFIG_CFG80211_REQUIRE_SIGNED_REGDB
 static struct key *builtin_regdb_keys;
 
 static void __init load_keys_from_buffer(const u8 *p, unsigned int buflen)
 {
     const u8 *end = p + buflen;
     size_t plen;
     key_ref_t key;
 
     while (p < end) {
         /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
          * than 256 bytes in size.
          */
         if (end - p < 4)
             goto dodgy_cert;
         if (p[0] != 0x30 &&
             p[1] != 0x82)
             goto dodgy_cert;
         plen = (p[2] << 8) | p[3];
         plen += 4;
         if (plen > end - p)
             goto dodgy_cert;
 
         key = key_create_or_update(make_key_ref(builtin_regdb_keys, 1),
                        "asymmetric", NULL, p, plen,
                        ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
                         KEY_USR_VIEW | KEY_USR_READ),
                        KEY_ALLOC_NOT_IN_QUOTA |
                        KEY_ALLOC_BUILT_IN |
                        KEY_ALLOC_BYPASS_RESTRICTION);
         if (IS_ERR(key)) {
             pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
                    PTR_ERR(key));
         } else {
             pr_notice("Loaded X.509 cert '%s'\n",
                   key_ref_to_ptr(key)->description);
             key_ref_put(key);
         }
         p += plen;
     }
 
     return;
 
 dodgy_cert:
     pr_err("Problem parsing in-kernel X.509 certificate list\n");
 }
 
 static int __init load_builtin_regdb_keys(void)
 {
     builtin_regdb_keys =
         keyring_alloc(".builtin_regdb_keys",
                   KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
                   ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
                   KEY_USR_VIEW | KEY_USR_READ | KEY_USR_SEARCH),
                   KEY_ALLOC_NOT_IN_QUOTA, NULL, NULL);
     if (IS_ERR(builtin_regdb_keys))
         return PTR_ERR(builtin_regdb_keys);
 
     pr_notice("Loading compiled-in X.509 certificates for regulatory database\n");
 
 #ifdef CONFIG_CFG80211_USE_KERNEL_REGDB_KEYS
     load_keys_from_buffer(shipped_regdb_certs, shipped_regdb_certs_len);
 #endif
 #ifdef CONFIG_CFG80211_EXTRA_REGDB_KEYDIR
     if (CONFIG_CFG80211_EXTRA_REGDB_KEYDIR[0] != '\0')
         load_keys_from_buffer(extra_regdb_certs, extra_regdb_certs_len);
 #endif
 
     return 0;
 }
 
 MODULE_FIRMWARE("regulatory.db.p7s");
 
 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
 {
     const struct firmware *sig;
     bool result;
 
     if (request_firmware(&sig, "regulatory.db.p7s", &reg_pdev->dev))
         return false;
 
     result = verify_pkcs7_signature(data, size, sig->data, sig->size,
                     builtin_regdb_keys,
                     VERIFYING_UNSPECIFIED_SIGNATURE,
                     NULL, NULL) == 0;
 
     release_firmware(sig);
 
     return result;
 }
 
 static void free_regdb_keyring(void)
 {
     key_put(builtin_regdb_keys);
 }
 #else
 static int load_builtin_regdb_keys(void)
 {
     return 0;
 }
 
 static bool regdb_has_valid_signature(const u8 *data, unsigned int size)
 {
     return true;
 }
 
 static void free_regdb_keyring(void)
 {
 }
 #endif /* CONFIG_CFG80211_REQUIRE_SIGNED_REGDB */
 
 static bool valid_regdb(const u8 *data, unsigned int size)
 {
     const struct fwdb_header *hdr = (void *)data;
     const struct fwdb_country *country;
 
     if (size < sizeof(*hdr))
         return false;
 
     if (hdr->magic != cpu_to_be32(FWDB_MAGIC))
         return false;
 
     if (hdr->version != cpu_to_be32(FWDB_VERSION))
         return false;
 
     if (!regdb_has_valid_signature(data, size))
         return false;
 
     country = &hdr->country[0];
     while ((u8 *)(country + 1) <= data + size) {
         if (!country->coll_ptr)
             break;
         if (!valid_country(data, size, country))
             return false;
         country++;
     }
 
     return true;
 }
 
 static void set_wmm_rule(const struct fwdb_header *db,
              const struct fwdb_country *country,
              const struct fwdb_rule *rule,
              struct ieee80211_reg_rule *rrule)
 {
     struct ieee80211_wmm_rule *wmm_rule = &rrule->wmm_rule;
     struct fwdb_wmm_rule *wmm;
     unsigned int i, wmm_ptr;
 
     wmm_ptr = be16_to_cpu(rule->wmm_ptr) << 2;
     wmm = (void *)((u8 *)db + wmm_ptr);
 
     if (!valid_wmm(wmm)) {
         pr_err("Invalid regulatory WMM rule %u-%u in domain %c%c\n",
                be32_to_cpu(rule->start), be32_to_cpu(rule->end),
                country->alpha2[0], country->alpha2[1]);
         return;
     }
 
     for (i = 0; i < IEEE80211_NUM_ACS; i++) {
         wmm_rule->client[i].cw_min =
             ecw2cw((wmm->client[i].ecw & 0xf0) >> 4);
         wmm_rule->client[i].cw_max = ecw2cw(wmm->client[i].ecw & 0x0f);
         wmm_rule->client[i].aifsn =  wmm->client[i].aifsn;
         wmm_rule->client[i].cot =
             1000 * be16_to_cpu(wmm->client[i].cot);
         wmm_rule->ap[i].cw_min = ecw2cw((wmm->ap[i].ecw & 0xf0) >> 4);
         wmm_rule->ap[i].cw_max = ecw2cw(wmm->ap[i].ecw & 0x0f);
         wmm_rule->ap[i].aifsn = wmm->ap[i].aifsn;
         wmm_rule->ap[i].cot = 1000 * be16_to_cpu(wmm->ap[i].cot);
     }
 
     rrule->has_wmm = true;
 }
 
 static int __regdb_query_wmm(const struct fwdb_header *db,
                  const struct fwdb_country *country, int freq,
                  struct ieee80211_reg_rule *rrule)
 {
     unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
     struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
     int i;
 
     for (i = 0; i < coll->n_rules; i++) {
         __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
         unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
         struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
 
         if (rule->len < offsetofend(struct fwdb_rule, wmm_ptr))
             continue;
 
         if (freq >= KHZ_TO_MHZ(be32_to_cpu(rule->start)) &&
             freq <= KHZ_TO_MHZ(be32_to_cpu(rule->end))) {
             set_wmm_rule(db, country, rule, rrule);
             return 0;
         }
     }
 
     return -ENODATA;
 }
 
 int reg_query_regdb_wmm(char *alpha2, int freq, struct ieee80211_reg_rule *rule)
 {
     const struct fwdb_header *hdr = regdb;
     const struct fwdb_country *country;
 
     if (!regdb)
         return -ENODATA;
 
     if (IS_ERR(regdb))
         return PTR_ERR(regdb);
 
     country = &hdr->country[0];
     while (country->coll_ptr) {
         if (alpha2_equal(alpha2, country->alpha2))
             return __regdb_query_wmm(regdb, country, freq, rule);
 
         country++;
     }
 
     return -ENODATA;
 }
 EXPORT_SYMBOL(reg_query_regdb_wmm);
 
 static int regdb_query_country(const struct fwdb_header *db,
                    const struct fwdb_country *country)
 {
     unsigned int ptr = be16_to_cpu(country->coll_ptr) << 2;
     struct fwdb_collection *coll = (void *)((u8 *)db + ptr);
     struct ieee80211_regdomain *regdom;
     unsigned int i;
 
     regdom = kzalloc(struct_size(regdom, reg_rules, coll->n_rules),
              GFP_KERNEL);
     if (!regdom)
         return -ENOMEM;
 
     regdom->n_reg_rules = coll->n_rules;
     regdom->alpha2[0] = country->alpha2[0];
     regdom->alpha2[1] = country->alpha2[1];
     regdom->dfs_region = coll->dfs_region;
 
     for (i = 0; i < regdom->n_reg_rules; i++) {
         __be16 *rules_ptr = (void *)((u8 *)coll + ALIGN(coll->len, 2));
         unsigned int rule_ptr = be16_to_cpu(rules_ptr[i]) << 2;
         struct fwdb_rule *rule = (void *)((u8 *)db + rule_ptr);
         struct ieee80211_reg_rule *rrule = &regdom->reg_rules[i];
 
         rrule->freq_range.start_freq_khz = be32_to_cpu(rule->start);
         rrule->freq_range.end_freq_khz = be32_to_cpu(rule->end);
         rrule->freq_range.max_bandwidth_khz = be32_to_cpu(rule->max_bw);
 
         rrule->power_rule.max_antenna_gain = 0;
         rrule->power_rule.max_eirp = be16_to_cpu(rule->max_eirp);
 
         rrule->flags = 0;
         if (rule->flags & FWDB_FLAG_NO_OFDM)
             rrule->flags |= NL80211_RRF_NO_OFDM;
         if (rule->flags & FWDB_FLAG_NO_OUTDOOR)
             rrule->flags |= NL80211_RRF_NO_OUTDOOR;
         if (rule->flags & FWDB_FLAG_DFS)
             rrule->flags |= NL80211_RRF_DFS;
         if (rule->flags & FWDB_FLAG_NO_IR)
             rrule->flags |= NL80211_RRF_NO_IR;
         if (rule->flags & FWDB_FLAG_AUTO_BW)
             rrule->flags |= NL80211_RRF_AUTO_BW;
 
         rrule->dfs_cac_ms = 0;
 
         /* handle optional data */
         if (rule->len >= offsetofend(struct fwdb_rule, cac_timeout))
             rrule->dfs_cac_ms =
                 1000 * be16_to_cpu(rule->cac_timeout);
         if (rule->len >= offsetofend(struct fwdb_rule, wmm_ptr))
             set_wmm_rule(db, country, rule, rrule);
     }
 
     return reg_schedule_apply(regdom);
 }
 
 static int query_regdb(const char *alpha2)
 {
     const struct fwdb_header *hdr = regdb;
     const struct fwdb_country *country;
 
     ASSERT_RTNL();
 
     if (IS_ERR(regdb))
         return PTR_ERR(regdb);
 
     country = &hdr->country[0];
     while (country->coll_ptr) {
         if (alpha2_equal(alpha2, country->alpha2))
             return regdb_query_country(regdb, country);
         country++;
     }
 
     return -ENODATA;
 }
 
 static void regdb_fw_cb(const struct firmware *fw, void *context)
 {
     int set_error = 0;
     bool restore = true;
     void *db;
 
     if (!fw) {
         pr_info("failed to load regulatory.db\n");
         set_error = -ENODATA;
     } else if (!valid_regdb(fw->data, fw->size)) {
         pr_info("loaded regulatory.db is malformed or signature is missing/invalid\n");
         set_error = -EINVAL;
     }
 
     rtnl_lock();
     if (regdb && !IS_ERR(regdb)) {
         /* negative case - a bug
          * positive case - can happen due to race in case of multiple cb's in
          * queue, due to usage of asynchronous callback
          *
          * Either case, just restore and free new db.
          */
     } else if (set_error) {
         regdb = ERR_PTR(set_error);
     } else if (fw) {
         db = kmemdup(fw->data, fw->size, GFP_KERNEL);
         if (db) {
             regdb = db;
             restore = context && query_regdb(context);
         } else {
             restore = true;
         }
     }
 
     if (restore)
         restore_regulatory_settings(true, false);
 
     rtnl_unlock();
 
     kfree(context);
 
     release_firmware(fw);
 }
 
 MODULE_FIRMWARE("regulatory.db");
 
 static int query_regdb_file(const char *alpha2)
 {
     ASSERT_RTNL();
 
     if (regdb)
         return query_regdb(alpha2);
 
     alpha2 = kmemdup(alpha2, 2, GFP_KERNEL);
     if (!alpha2)
         return -ENOMEM;
 
     return request_firmware_nowait(THIS_MODULE, true, "regulatory.db",
                        &reg_pdev->dev, GFP_KERNEL,
                        (void *)alpha2, regdb_fw_cb);
 }
 
 int reg_reload_regdb(void)
 {
     const struct firmware *fw;
     void *db;
     int err;
     const struct ieee80211_regdomain *current_regdomain;
     struct regulatory_request *request;
 
     err = request_firmware(&fw, "regulatory.db", &reg_pdev->dev);
     if (err)
         return err;
 
     if (!valid_regdb(fw->data, fw->size)) {
         err = -ENODATA;
         goto out;
     }
 
     db = kmemdup(fw->data, fw->size, GFP_KERNEL);
     if (!db) {
         err = -ENOMEM;
         goto out;
     }
 
     rtnl_lock();
     if (!IS_ERR_OR_NULL(regdb))
         kfree(regdb);
     regdb = db;
 
     /* reset regulatory domain */
     current_regdomain = get_cfg80211_regdom();
 
     request = kzalloc(sizeof(*request), GFP_KERNEL);
     if (!request) {
         err = -ENOMEM;
         goto out_unlock;
     }
 
     request->wiphy_idx = WIPHY_IDX_INVALID;
     request->alpha2[0] = current_regdomain->alpha2[0];
     request->alpha2[1] = current_regdomain->alpha2[1];
     request->initiator = NL80211_REGDOM_SET_BY_CORE;
     request->user_reg_hint_type = NL80211_USER_REG_HINT_USER;
 
     reg_process_hint(request);
 
 out_unlock:
     rtnl_unlock();
  out:
     release_firmware(fw);
     return err;
 }
 
 static bool reg_query_database(struct regulatory_request *request)
 {
     if (query_regdb_file(request->alpha2) == 0)
         return true;
 
     if (call_crda(request->alpha2) == 0)
         return true;
 
     return false;
 }
 
 bool reg_is_valid_request(const char *alpha2)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (!lr || lr->processed)
         return false;
 
     return alpha2_equal(lr->alpha2, alpha2);
 }
 
 static const struct ieee80211_regdomain *reg_get_regdomain(struct wiphy *wiphy)
 {
     struct regulatory_request *lr = get_last_request();
 
     /*
      * Follow the driver's regulatory domain, if present, unless a country
      * IE has been processed or a user wants to help complaince further
      */
     if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
         lr->initiator != NL80211_REGDOM_SET_BY_USER &&
         wiphy->regd)
         return get_wiphy_regdom(wiphy);
 
     return get_cfg80211_regdom();
 }
 
 static unsigned int
 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain *rd,
                  const struct ieee80211_reg_rule *rule)
 {
     const struct ieee80211_freq_range *freq_range = &rule->freq_range;
     const struct ieee80211_freq_range *freq_range_tmp;
     const struct ieee80211_reg_rule *tmp;
     u32 start_freq, end_freq, idx, no;
 
     for (idx = 0; idx < rd->n_reg_rules; idx++)
         if (rule == &rd->reg_rules[idx])
             break;
 
     if (idx == rd->n_reg_rules)
         return 0;
 
     /* get start_freq */
     no = idx;
 
     while (no) {
         tmp = &rd->reg_rules[--no];
         freq_range_tmp = &tmp->freq_range;
 
         if (freq_range_tmp->end_freq_khz < freq_range->start_freq_khz)
             break;
 
         freq_range = freq_range_tmp;
     }
 
     start_freq = freq_range->start_freq_khz;
 
     /* get end_freq */
     freq_range = &rule->freq_range;
     no = idx;
 
     while (no < rd->n_reg_rules - 1) {
         tmp = &rd->reg_rules[++no];
         freq_range_tmp = &tmp->freq_range;
 
         if (freq_range_tmp->start_freq_khz > freq_range->end_freq_khz)
             break;
 
         freq_range = freq_range_tmp;
     }
 
     end_freq = freq_range->end_freq_khz;
 
     return end_freq - start_freq;
 }
 
 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain *rd,
                    const struct ieee80211_reg_rule *rule)
 {
     unsigned int bw = reg_get_max_bandwidth_from_range(rd, rule);
 
     if (rule->flags & NL80211_RRF_NO_320MHZ)
         bw = min_t(unsigned int, bw, MHZ_TO_KHZ(160));
     if (rule->flags & NL80211_RRF_NO_160MHZ)
         bw = min_t(unsigned int, bw, MHZ_TO_KHZ(80));
     if (rule->flags & NL80211_RRF_NO_80MHZ)
         bw = min_t(unsigned int, bw, MHZ_TO_KHZ(40));
 
     /*
      * HT40+/HT40- limits are handled per-channel. Only limit BW if both
      * are not allowed.
      */
     if (rule->flags & NL80211_RRF_NO_HT40MINUS &&
         rule->flags & NL80211_RRF_NO_HT40PLUS)
         bw = min_t(unsigned int, bw, MHZ_TO_KHZ(20));
 
     return bw;
 }
 
 /* Sanity check on a regulatory rule */
 static bool is_valid_reg_rule(const struct ieee80211_reg_rule *rule)
 {
     const struct ieee80211_freq_range *freq_range = &rule->freq_range;
     u32 freq_diff;
 
     if (freq_range->start_freq_khz <= 0 || freq_range->end_freq_khz <= 0)
         return false;
 
     if (freq_range->start_freq_khz > freq_range->end_freq_khz)
         return false;
 
     freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
 
     if (freq_range->end_freq_khz <= freq_range->start_freq_khz ||
         freq_range->max_bandwidth_khz > freq_diff)
         return false;
 
     return true;
 }
 
 static bool is_valid_rd(const struct ieee80211_regdomain *rd)
 {
     const struct ieee80211_reg_rule *reg_rule = NULL;
     unsigned int i;
 
     if (!rd->n_reg_rules)
         return false;
 
     if (WARN_ON(rd->n_reg_rules > NL80211_MAX_SUPP_REG_RULES))
         return false;
 
     for (i = 0; i < rd->n_reg_rules; i++) {
         reg_rule = &rd->reg_rules[i];
         if (!is_valid_reg_rule(reg_rule))
             return false;
     }
 
     return true;
 }
 
 /**
  * freq_in_rule_band - tells us if a frequency is in a frequency band
  * @freq_range: frequency rule we want to query
  * @freq_khz: frequency we are inquiring about
  *
  * This lets us know if a specific frequency rule is or is not relevant to
  * a specific frequency's band. Bands are device specific and artificial
  * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
  * however it is safe for now to assume that a frequency rule should not be
  * part of a frequency's band if the start freq or end freq are off by more
  * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 20 GHz for the
  * 60 GHz band.
  * This resolution can be lowered and should be considered as we add
  * regulatory rule support for other "bands".
  **/
 static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range,
                   u32 freq_khz)
 {
 #define ONE_GHZ_IN_KHZ  1000000
     /*
      * From 802.11ad: directional multi-gigabit (DMG):
      * Pertaining to operation in a frequency band containing a channel
      * with the Channel starting frequency above 45 GHz.
      */
     u32 limit = freq_khz > 45 * ONE_GHZ_IN_KHZ ?
             20 * ONE_GHZ_IN_KHZ : 2 * ONE_GHZ_IN_KHZ;
     if (abs(freq_khz - freq_range->start_freq_khz) <= limit)
         return true;
     if (abs(freq_khz - freq_range->end_freq_khz) <= limit)
         return true;
     return false;
 #undef ONE_GHZ_IN_KHZ
 }
 
 /*
  * Later on we can perhaps use the more restrictive DFS
  * region but we don't have information for that yet so
  * for now simply disallow conflicts.
  */
 static enum nl80211_dfs_regions
 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1,
              const enum nl80211_dfs_regions dfs_region2)
 {
     if (dfs_region1 != dfs_region2)
         return NL80211_DFS_UNSET;
     return dfs_region1;
 }
 
 static void reg_wmm_rules_intersect(const struct ieee80211_wmm_ac *wmm_ac1,
                     const struct ieee80211_wmm_ac *wmm_ac2,
                     struct ieee80211_wmm_ac *intersect)
 {
     intersect->cw_min = max_t(u16, wmm_ac1->cw_min, wmm_ac2->cw_min);
     intersect->cw_max = max_t(u16, wmm_ac1->cw_max, wmm_ac2->cw_max);
     intersect->cot = min_t(u16, wmm_ac1->cot, wmm_ac2->cot);
     intersect->aifsn = max_t(u8, wmm_ac1->aifsn, wmm_ac2->aifsn);
 }
 
 /*
  * Helper for regdom_intersect(), this does the real
  * mathematical intersection fun
  */
 static int reg_rules_intersect(const struct ieee80211_regdomain *rd1,
                    const struct ieee80211_regdomain *rd2,
                    const struct ieee80211_reg_rule *rule1,
                    const struct ieee80211_reg_rule *rule2,
                    struct ieee80211_reg_rule *intersected_rule)
 {
     const struct ieee80211_freq_range *freq_range1, *freq_range2;
     struct ieee80211_freq_range *freq_range;
     const struct ieee80211_power_rule *power_rule1, *power_rule2;
     struct ieee80211_power_rule *power_rule;
     const struct ieee80211_wmm_rule *wmm_rule1, *wmm_rule2;
     struct ieee80211_wmm_rule *wmm_rule;
     u32 freq_diff, max_bandwidth1, max_bandwidth2;
 
     freq_range1 = &rule1->freq_range;
     freq_range2 = &rule2->freq_range;
     freq_range = &intersected_rule->freq_range;
 
     power_rule1 = &rule1->power_rule;
     power_rule2 = &rule2->power_rule;
     power_rule = &intersected_rule->power_rule;
 
     wmm_rule1 = &rule1->wmm_rule;
     wmm_rule2 = &rule2->wmm_rule;
     wmm_rule = &intersected_rule->wmm_rule;
 
     freq_range->start_freq_khz = max(freq_range1->start_freq_khz,
                      freq_range2->start_freq_khz);
     freq_range->end_freq_khz = min(freq_range1->end_freq_khz,
                        freq_range2->end_freq_khz);
 
     max_bandwidth1 = freq_range1->max_bandwidth_khz;
     max_bandwidth2 = freq_range2->max_bandwidth_khz;
 
     if (rule1->flags & NL80211_RRF_AUTO_BW)
         max_bandwidth1 = reg_get_max_bandwidth(rd1, rule1);
     if (rule2->flags & NL80211_RRF_AUTO_BW)
         max_bandwidth2 = reg_get_max_bandwidth(rd2, rule2);
 
     freq_range->max_bandwidth_khz = min(max_bandwidth1, max_bandwidth2);
 
     intersected_rule->flags = rule1->flags | rule2->flags;
 
     /*
      * In case NL80211_RRF_AUTO_BW requested for both rules
      * set AUTO_BW in intersected rule also. Next we will
      * calculate BW correctly in handle_channel function.
      * In other case remove AUTO_BW flag while we calculate
      * maximum bandwidth correctly and auto calculation is
      * not required.
      */
     if ((rule1->flags & NL80211_RRF_AUTO_BW) &&
         (rule2->flags & NL80211_RRF_AUTO_BW))
         intersected_rule->flags |= NL80211_RRF_AUTO_BW;
     else
         intersected_rule->flags &= ~NL80211_RRF_AUTO_BW;
 
     freq_diff = freq_range->end_freq_khz - freq_range->start_freq_khz;
     if (freq_range->max_bandwidth_khz > freq_diff)
         freq_range->max_bandwidth_khz = freq_diff;
 
     power_rule->max_eirp = min(power_rule1->max_eirp,
         power_rule2->max_eirp);
     power_rule->max_antenna_gain = min(power_rule1->max_antenna_gain,
         power_rule2->max_antenna_gain);
 
     intersected_rule->dfs_cac_ms = max(rule1->dfs_cac_ms,
                        rule2->dfs_cac_ms);
 
     if (rule1->has_wmm && rule2->has_wmm) {
         u8 ac;
 
         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
             reg_wmm_rules_intersect(&wmm_rule1->client[ac],
                         &wmm_rule2->client[ac],
                         &wmm_rule->client[ac]);
             reg_wmm_rules_intersect(&wmm_rule1->ap[ac],
                         &wmm_rule2->ap[ac],
                         &wmm_rule->ap[ac]);
         }
 
         intersected_rule->has_wmm = true;
     } else if (rule1->has_wmm) {
         *wmm_rule = *wmm_rule1;
         intersected_rule->has_wmm = true;
     } else if (rule2->has_wmm) {
         *wmm_rule = *wmm_rule2;
         intersected_rule->has_wmm = true;
     } else {
         intersected_rule->has_wmm = false;
     }
 
     if (!is_valid_reg_rule(intersected_rule))
         return -EINVAL;
 
     return 0;
 }
 
 /* check whether old rule contains new rule */
 static bool rule_contains(struct ieee80211_reg_rule *r1,
               struct ieee80211_reg_rule *r2)
 {
     /* for simplicity, currently consider only same flags */
     if (r1->flags != r2->flags)
         return false;
 
     /* verify r1 is more restrictive */
     if ((r1->power_rule.max_antenna_gain >
          r2->power_rule.max_antenna_gain) ||
         r1->power_rule.max_eirp > r2->power_rule.max_eirp)
         return false;
 
     /* make sure r2's range is contained within r1 */
     if (r1->freq_range.start_freq_khz > r2->freq_range.start_freq_khz ||
         r1->freq_range.end_freq_khz < r2->freq_range.end_freq_khz)
         return false;
 
     /* and finally verify that r1.max_bw >= r2.max_bw */
     if (r1->freq_range.max_bandwidth_khz <
         r2->freq_range.max_bandwidth_khz)
         return false;
 
     return true;
 }
 
 /* add or extend current rules. do nothing if rule is already contained */
 static void add_rule(struct ieee80211_reg_rule *rule,
              struct ieee80211_reg_rule *reg_rules, u32 *n_rules)
 {
     struct ieee80211_reg_rule *tmp_rule;
     int i;
 
     for (i = 0; i < *n_rules; i++) {
         tmp_rule = &reg_rules[i];
         /* rule is already contained - do nothing */
         if (rule_contains(tmp_rule, rule))
             return;
 
         /* extend rule if possible */
         if (rule_contains(rule, tmp_rule)) {
             memcpy(tmp_rule, rule, sizeof(*rule));
             return;
         }
     }
 
     memcpy(&reg_rules[*n_rules], rule, sizeof(*rule));
     (*n_rules)++;
 }
 
 /**
  * regdom_intersect - do the intersection between two regulatory domains
  * @rd1: first regulatory domain
  * @rd2: second regulatory domain
  *
  * Use this function to get the intersection between two regulatory domains.
  * Once completed we will mark the alpha2 for the rd as intersected, "98",
  * as no one single alpha2 can represent this regulatory domain.
  *
  * Returns a pointer to the regulatory domain structure which will hold the
  * resulting intersection of rules between rd1 and rd2. We will
  * kzalloc() this structure for you.
  */
 static struct ieee80211_regdomain *
 regdom_intersect(const struct ieee80211_regdomain *rd1,
          const struct ieee80211_regdomain *rd2)
 {
     int r;
     unsigned int x, y;
     unsigned int num_rules = 0;
     const struct ieee80211_reg_rule *rule1, *rule2;
     struct ieee80211_reg_rule intersected_rule;
     struct ieee80211_regdomain *rd;
 
     if (!rd1 || !rd2)
         return NULL;
 
     /*
      * First we get a count of the rules we'll need, then we actually
      * build them. This is to so we can malloc() and free() a
      * regdomain once. The reason we use reg_rules_intersect() here
      * is it will return -EINVAL if the rule computed makes no sense.
      * All rules that do check out OK are valid.
      */
 
     for (x = 0; x < rd1->n_reg_rules; x++) {
         rule1 = &rd1->reg_rules[x];
         for (y = 0; y < rd2->n_reg_rules; y++) {
             rule2 = &rd2->reg_rules[y];
             if (!reg_rules_intersect(rd1, rd2, rule1, rule2,
                          &intersected_rule))
                 num_rules++;
         }
     }
 
     if (!num_rules)
         return NULL;
 
     rd = kzalloc(struct_size(rd, reg_rules, num_rules), GFP_KERNEL);
     if (!rd)
         return NULL;
 
     for (x = 0; x < rd1->n_reg_rules; x++) {
         rule1 = &rd1->reg_rules[x];
         for (y = 0; y < rd2->n_reg_rules; y++) {
             rule2 = &rd2->reg_rules[y];
             r = reg_rules_intersect(rd1, rd2, rule1, rule2,
                         &intersected_rule);
             /*
              * No need to memset here the intersected rule here as
              * we're not using the stack anymore
              */
             if (r)
                 continue;
 
             add_rule(&intersected_rule, rd->reg_rules,
                  &rd->n_reg_rules);
         }
     }
 
     rd->alpha2[0] = '9';
     rd->alpha2[1] = '8';
     rd->dfs_region = reg_intersect_dfs_region(rd1->dfs_region,
                           rd2->dfs_region);
 
     return rd;
 }
 
 /*
  * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
  * want to just have the channel structure use these
  */
 static u32 map_regdom_flags(u32 rd_flags)
 {
     u32 channel_flags = 0;
     if (rd_flags & NL80211_RRF_NO_IR_ALL)
         channel_flags |= IEEE80211_CHAN_NO_IR;
     if (rd_flags & NL80211_RRF_DFS)
         channel_flags |= IEEE80211_CHAN_RADAR;
     if (rd_flags & NL80211_RRF_NO_OFDM)
         channel_flags |= IEEE80211_CHAN_NO_OFDM;
     if (rd_flags & NL80211_RRF_NO_OUTDOOR)
         channel_flags |= IEEE80211_CHAN_INDOOR_ONLY;
     if (rd_flags & NL80211_RRF_IR_CONCURRENT)
         channel_flags |= IEEE80211_CHAN_IR_CONCURRENT;
     if (rd_flags & NL80211_RRF_NO_HT40MINUS)
         channel_flags |= IEEE80211_CHAN_NO_HT40MINUS;
     if (rd_flags & NL80211_RRF_NO_HT40PLUS)
         channel_flags |= IEEE80211_CHAN_NO_HT40PLUS;
     if (rd_flags & NL80211_RRF_NO_80MHZ)
         channel_flags |= IEEE80211_CHAN_NO_80MHZ;
     if (rd_flags & NL80211_RRF_NO_160MHZ)
         channel_flags |= IEEE80211_CHAN_NO_160MHZ;
     if (rd_flags & NL80211_RRF_NO_HE)
         channel_flags |= IEEE80211_CHAN_NO_HE;
     if (rd_flags & NL80211_RRF_NO_320MHZ)
         channel_flags |= IEEE80211_CHAN_NO_320MHZ;
     return channel_flags;
 }
 
 static const struct ieee80211_reg_rule *
 freq_reg_info_regd(u32 center_freq,
            const struct ieee80211_regdomain *regd, u32 bw)
 {
     int i;
     bool band_rule_found = false;
     bool bw_fits = false;
 
     if (!regd)
         return ERR_PTR(-EINVAL);
 
     for (i = 0; i < regd->n_reg_rules; i++) {
         const struct ieee80211_reg_rule *rr;
         const struct ieee80211_freq_range *fr = NULL;
 
         rr = &regd->reg_rules[i];
         fr = &rr->freq_range;
 
         /*
          * We only need to know if one frequency rule was
          * in center_freq's band, that's enough, so let's
          * not overwrite it once found
          */
         if (!band_rule_found)
             band_rule_found = freq_in_rule_band(fr, center_freq);
 
         bw_fits = cfg80211_does_bw_fit_range(fr, center_freq, bw);
 
         if (band_rule_found && bw_fits)
             return rr;
     }
 
     if (!band_rule_found)
         return ERR_PTR(-ERANGE);
 
     return ERR_PTR(-EINVAL);
 }
 
 static const struct ieee80211_reg_rule *
 __freq_reg_info(struct wiphy *wiphy, u32 center_freq, u32 min_bw)
 {
     const struct ieee80211_regdomain *regd = reg_get_regdomain(wiphy);
     static const u32 bws[] = {0, 1, 2, 4, 5, 8, 10, 16, 20};
     const struct ieee80211_reg_rule *reg_rule = ERR_PTR(-ERANGE);
     int i = ARRAY_SIZE(bws) - 1;
     u32 bw;
 
     for (bw = MHZ_TO_KHZ(bws[i]); bw >= min_bw; bw = MHZ_TO_KHZ(bws[i--])) {
         reg_rule = freq_reg_info_regd(center_freq, regd, bw);
         if (!IS_ERR(reg_rule))
             return reg_rule;
     }
 
     return reg_rule;
 }
 
 const struct ieee80211_reg_rule *freq_reg_info(struct wiphy *wiphy,
                            u32 center_freq)
 {
     u32 min_bw = center_freq < MHZ_TO_KHZ(1000) ? 1 : 20;
 
     return __freq_reg_info(wiphy, center_freq, MHZ_TO_KHZ(min_bw));
 }
 EXPORT_SYMBOL(freq_reg_info);
 
 const char *reg_initiator_name(enum nl80211_reg_initiator initiator)
 {
     switch (initiator) {
     case NL80211_REGDOM_SET_BY_CORE:
         return "core";
     case NL80211_REGDOM_SET_BY_USER:
         return "user";
     case NL80211_REGDOM_SET_BY_DRIVER:
         return "driver";
     case NL80211_REGDOM_SET_BY_COUNTRY_IE:
         return "country element";
     default:
         WARN_ON(1);
         return "bug";
     }
 }
 EXPORT_SYMBOL(reg_initiator_name);
 
 static uint32_t reg_rule_to_chan_bw_flags(const struct ieee80211_regdomain *regd,
                       const struct ieee80211_reg_rule *reg_rule,
                       const struct ieee80211_channel *chan)
 {
     const struct ieee80211_freq_range *freq_range = NULL;
     u32 max_bandwidth_khz, center_freq_khz, bw_flags = 0;
     bool is_s1g = chan->band == NL80211_BAND_S1GHZ;
 
     freq_range = &reg_rule->freq_range;
 
     max_bandwidth_khz = freq_range->max_bandwidth_khz;
     center_freq_khz = ieee80211_channel_to_khz(chan);
     /* Check if auto calculation requested */
     if (reg_rule->flags & NL80211_RRF_AUTO_BW)
         max_bandwidth_khz = reg_get_max_bandwidth(regd, reg_rule);
 
     /* If we get a reg_rule we can assume that at least 5Mhz fit */
     if (!cfg80211_does_bw_fit_range(freq_range,
                     center_freq_khz,
                     MHZ_TO_KHZ(10)))
         bw_flags |= IEEE80211_CHAN_NO_10MHZ;
     if (!cfg80211_does_bw_fit_range(freq_range,
                     center_freq_khz,
                     MHZ_TO_KHZ(20)))
         bw_flags |= IEEE80211_CHAN_NO_20MHZ;
 
     if (is_s1g) {
         /* S1G is strict about non overlapping channels. We can
          * calculate which bandwidth is allowed per channel by finding
          * the largest bandwidth which cleanly divides the freq_range.
          */
         int edge_offset;
         int ch_bw = max_bandwidth_khz;
 
         while (ch_bw) {
             edge_offset = (center_freq_khz - ch_bw / 2) -
                       freq_range->start_freq_khz;
             if (edge_offset % ch_bw == 0) {
                 switch (KHZ_TO_MHZ(ch_bw)) {
                 case 1:
                     bw_flags |= IEEE80211_CHAN_1MHZ;
                     break;
                 case 2:
                     bw_flags |= IEEE80211_CHAN_2MHZ;
                     break;
                 case 4:
                     bw_flags |= IEEE80211_CHAN_4MHZ;
                     break;
                 case 8:
                     bw_flags |= IEEE80211_CHAN_8MHZ;
                     break;
                 case 16:
                     bw_flags |= IEEE80211_CHAN_16MHZ;
                     break;
                 default:
                     /* If we got here, no bandwidths fit on
                      * this frequency, ie. band edge.
                      */
                     bw_flags |= IEEE80211_CHAN_DISABLED;
                     break;
                 }
                 break;
             }
             ch_bw /= 2;
         }
     } else {
         if (max_bandwidth_khz < MHZ_TO_KHZ(10))
             bw_flags |= IEEE80211_CHAN_NO_10MHZ;
         if (max_bandwidth_khz < MHZ_TO_KHZ(20))
             bw_flags |= IEEE80211_CHAN_NO_20MHZ;
         if (max_bandwidth_khz < MHZ_TO_KHZ(40))
             bw_flags |= IEEE80211_CHAN_NO_HT40;
         if (max_bandwidth_khz < MHZ_TO_KHZ(80))
             bw_flags |= IEEE80211_CHAN_NO_80MHZ;
         if (max_bandwidth_khz < MHZ_TO_KHZ(160))
             bw_flags |= IEEE80211_CHAN_NO_160MHZ;
         if (max_bandwidth_khz < MHZ_TO_KHZ(320))
             bw_flags |= IEEE80211_CHAN_NO_320MHZ;
     }
     return bw_flags;
 }
 
 static void handle_channel_single_rule(struct wiphy *wiphy,
                        enum nl80211_reg_initiator initiator,
                        struct ieee80211_channel *chan,
                        u32 flags,
                        struct regulatory_request *lr,
                        struct wiphy *request_wiphy,
                        const struct ieee80211_reg_rule *reg_rule)
 {
     u32 bw_flags = 0;
     const struct ieee80211_power_rule *power_rule = NULL;
     const struct ieee80211_regdomain *regd;
 
     regd = reg_get_regdomain(wiphy);
 
     power_rule = &reg_rule->power_rule;
     bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
 
     if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
         request_wiphy && request_wiphy == wiphy &&
         request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
         /*
          * This guarantees the driver's requested regulatory domain
          * will always be used as a base for further regulatory
          * settings
          */
         chan->flags = chan->orig_flags =
             map_regdom_flags(reg_rule->flags) | bw_flags;
         chan->max_antenna_gain = chan->orig_mag =
             (int) MBI_TO_DBI(power_rule->max_antenna_gain);
         chan->max_reg_power = chan->max_power = chan->orig_mpwr =
             (int) MBM_TO_DBM(power_rule->max_eirp);
 
         if (chan->flags & IEEE80211_CHAN_RADAR) {
             chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
             if (reg_rule->dfs_cac_ms)
                 chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
         }
 
         return;
     }
 
     chan->dfs_state = NL80211_DFS_USABLE;
     chan->dfs_state_entered = jiffies;
 
     chan->beacon_found = false;
     chan->flags = flags | bw_flags | map_regdom_flags(reg_rule->flags);
     chan->max_antenna_gain =
         min_t(int, chan->orig_mag,
               MBI_TO_DBI(power_rule->max_antenna_gain));
     chan->max_reg_power = (int) MBM_TO_DBM(power_rule->max_eirp);
 
     if (chan->flags & IEEE80211_CHAN_RADAR) {
         if (reg_rule->dfs_cac_ms)
             chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
         else
             chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
     }
 
     if (chan->orig_mpwr) {
         /*
          * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
          * will always follow the passed country IE power settings.
          */
         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
             wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
             chan->max_power = chan->max_reg_power;
         else
             chan->max_power = min(chan->orig_mpwr,
                           chan->max_reg_power);
     } else
         chan->max_power = chan->max_reg_power;
 }
 
 static void handle_channel_adjacent_rules(struct wiphy *wiphy,
                       enum nl80211_reg_initiator initiator,
                       struct ieee80211_channel *chan,
                       u32 flags,
                       struct regulatory_request *lr,
                       struct wiphy *request_wiphy,
                       const struct ieee80211_reg_rule *rrule1,
                       const struct ieee80211_reg_rule *rrule2,
                       struct ieee80211_freq_range *comb_range)
 {
     u32 bw_flags1 = 0;
     u32 bw_flags2 = 0;
     const struct ieee80211_power_rule *power_rule1 = NULL;
     const struct ieee80211_power_rule *power_rule2 = NULL;
     const struct ieee80211_regdomain *regd;
 
     regd = reg_get_regdomain(wiphy);
 
     power_rule1 = &rrule1->power_rule;
     power_rule2 = &rrule2->power_rule;
     bw_flags1 = reg_rule_to_chan_bw_flags(regd, rrule1, chan);
     bw_flags2 = reg_rule_to_chan_bw_flags(regd, rrule2, chan);
 
     if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
         request_wiphy && request_wiphy == wiphy &&
         request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
         /* This guarantees the driver's requested regulatory domain
          * will always be used as a base for further regulatory
          * settings
          */
         chan->flags =
             map_regdom_flags(rrule1->flags) |
             map_regdom_flags(rrule2->flags) |
             bw_flags1 |
             bw_flags2;
         chan->orig_flags = chan->flags;
         chan->max_antenna_gain =
             min_t(int, MBI_TO_DBI(power_rule1->max_antenna_gain),
                   MBI_TO_DBI(power_rule2->max_antenna_gain));
         chan->orig_mag = chan->max_antenna_gain;
         chan->max_reg_power =
             min_t(int, MBM_TO_DBM(power_rule1->max_eirp),
                   MBM_TO_DBM(power_rule2->max_eirp));
         chan->max_power = chan->max_reg_power;
         chan->orig_mpwr = chan->max_reg_power;
 
         if (chan->flags & IEEE80211_CHAN_RADAR) {
             chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
             if (rrule1->dfs_cac_ms || rrule2->dfs_cac_ms)
                 chan->dfs_cac_ms = max_t(unsigned int,
                              rrule1->dfs_cac_ms,
                              rrule2->dfs_cac_ms);
         }
 
         return;
     }
 
     chan->dfs_state = NL80211_DFS_USABLE;
     chan->dfs_state_entered = jiffies;
 
     chan->beacon_found = false;
     chan->flags = flags | bw_flags1 | bw_flags2 |
               map_regdom_flags(rrule1->flags) |
               map_regdom_flags(rrule2->flags);
 
     /* reg_rule_to_chan_bw_flags may forbids 10 and forbids 20 MHz
      * (otherwise no adj. rule case), recheck therefore
      */
     if (cfg80211_does_bw_fit_range(comb_range,
                        ieee80211_channel_to_khz(chan),
                        MHZ_TO_KHZ(10)))
         chan->flags &= ~IEEE80211_CHAN_NO_10MHZ;
     if (cfg80211_does_bw_fit_range(comb_range,
                        ieee80211_channel_to_khz(chan),
                        MHZ_TO_KHZ(20)))
         chan->flags &= ~IEEE80211_CHAN_NO_20MHZ;
 
     chan->max_antenna_gain =
         min_t(int, chan->orig_mag,
               min_t(int,
                 MBI_TO_DBI(power_rule1->max_antenna_gain),
                 MBI_TO_DBI(power_rule2->max_antenna_gain)));
     chan->max_reg_power = min_t(int,
                     MBM_TO_DBM(power_rule1->max_eirp),
                     MBM_TO_DBM(power_rule2->max_eirp));
 
     if (chan->flags & IEEE80211_CHAN_RADAR) {
         if (rrule1->dfs_cac_ms || rrule2->dfs_cac_ms)
             chan->dfs_cac_ms = max_t(unsigned int,
                          rrule1->dfs_cac_ms,
                          rrule2->dfs_cac_ms);
         else
             chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
     }
 
     if (chan->orig_mpwr) {
         /* Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
          * will always follow the passed country IE power settings.
          */
         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
             wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_FOLLOW_POWER)
             chan->max_power = chan->max_reg_power;
         else
             chan->max_power = min(chan->orig_mpwr,
                           chan->max_reg_power);
     } else {
         chan->max_power = chan->max_reg_power;
     }
 }
 
 /* Note that right now we assume the desired channel bandwidth
  * is always 20 MHz for each individual channel (HT40 uses 20 MHz
  * per channel, the primary and the extension channel).
  */
 static void handle_channel(struct wiphy *wiphy,
                enum nl80211_reg_initiator initiator,
                struct ieee80211_channel *chan)
 {
     const u32 orig_chan_freq = ieee80211_channel_to_khz(chan);
     struct regulatory_request *lr = get_last_request();
     struct wiphy *request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
     const struct ieee80211_reg_rule *rrule = NULL;
     const struct ieee80211_reg_rule *rrule1 = NULL;
     const struct ieee80211_reg_rule *rrule2 = NULL;
 
     u32 flags = chan->orig_flags;
 
     rrule = freq_reg_info(wiphy, orig_chan_freq);
     if (IS_ERR(rrule)) {
         /* check for adjacent match, therefore get rules for
          * chan - 20 MHz and chan + 20 MHz and test
          * if reg rules are adjacent
          */
         rrule1 = freq_reg_info(wiphy,
                        orig_chan_freq - MHZ_TO_KHZ(20));
         rrule2 = freq_reg_info(wiphy,
                        orig_chan_freq + MHZ_TO_KHZ(20));
         if (!IS_ERR(rrule1) && !IS_ERR(rrule2)) {
             struct ieee80211_freq_range comb_range;
 
             if (rrule1->freq_range.end_freq_khz !=
                 rrule2->freq_range.start_freq_khz)
                 goto disable_chan;
 
             comb_range.start_freq_khz =
                 rrule1->freq_range.start_freq_khz;
             comb_range.end_freq_khz =
                 rrule2->freq_range.end_freq_khz;
             comb_range.max_bandwidth_khz =
                 min_t(u32,
                       rrule1->freq_range.max_bandwidth_khz,
                       rrule2->freq_range.max_bandwidth_khz);
 
             if (!cfg80211_does_bw_fit_range(&comb_range,
                             orig_chan_freq,
                             MHZ_TO_KHZ(20)))
                 goto disable_chan;
 
             handle_channel_adjacent_rules(wiphy, initiator, chan,
                               flags, lr, request_wiphy,
                               rrule1, rrule2,
                               &comb_range);
             return;
         }
 
 disable_chan:
         /* We will disable all channels that do not match our
          * received regulatory rule unless the hint is coming
          * from a Country IE and the Country IE had no information
          * about a band. The IEEE 802.11 spec allows for an AP
          * to send only a subset of the regulatory rules allowed,
          * so an AP in the US that only supports 2.4 GHz may only send
          * a country IE with information for the 2.4 GHz band
          * while 5 GHz is still supported.
          */
         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
             PTR_ERR(rrule) == -ERANGE)
             return;
 
         if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
             request_wiphy && request_wiphy == wiphy &&
             request_wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
             pr_debug("Disabling freq %d.%03d MHz for good\n",
                  chan->center_freq, chan->freq_offset);
             chan->orig_flags |= IEEE80211_CHAN_DISABLED;
             chan->flags = chan->orig_flags;
         } else {
             pr_debug("Disabling freq %d.%03d MHz\n",
                  chan->center_freq, chan->freq_offset);
             chan->flags |= IEEE80211_CHAN_DISABLED;
         }
         return;
     }
 
     handle_channel_single_rule(wiphy, initiator, chan, flags, lr,
                    request_wiphy, rrule);
 }
 
 static void handle_band(struct wiphy *wiphy,
             enum nl80211_reg_initiator initiator,
             struct ieee80211_supported_band *sband)
 {
     unsigned int i;
 
     if (!sband)
         return;
 
     for (i = 0; i < sband->n_channels; i++)
         handle_channel(wiphy, initiator, &sband->channels[i]);
 }
 
 static bool reg_request_cell_base(struct regulatory_request *request)
 {
     if (request->initiator != NL80211_REGDOM_SET_BY_USER)
         return false;
     return request->user_reg_hint_type == NL80211_USER_REG_HINT_CELL_BASE;
 }
 
 bool reg_last_request_cell_base(void)
 {
     return reg_request_cell_base(get_last_request());
 }
 
 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
 /* Core specific check */
 static enum reg_request_treatment
 reg_ignore_cell_hint(struct regulatory_request *pending_request)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (!reg_num_devs_support_basehint)
         return REG_REQ_IGNORE;
 
     if (reg_request_cell_base(lr) &&
         !regdom_changes(pending_request->alpha2))
         return REG_REQ_ALREADY_SET;
 
     return REG_REQ_OK;
 }
 
 /* Device specific check */
 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
 {
     return !(wiphy->features & NL80211_FEATURE_CELL_BASE_REG_HINTS);
 }
 #else
 static enum reg_request_treatment
 reg_ignore_cell_hint(struct regulatory_request *pending_request)
 {
     return REG_REQ_IGNORE;
 }
 
 static bool reg_dev_ignore_cell_hint(struct wiphy *wiphy)
 {
     return true;
 }
 #endif
 
 static bool wiphy_strict_alpha2_regd(struct wiphy *wiphy)
 {
     if (wiphy->regulatory_flags & REGULATORY_STRICT_REG &&
         !(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG))
         return true;
     return false;
 }
 
 static bool ignore_reg_update(struct wiphy *wiphy,
                   enum nl80211_reg_initiator initiator)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
         return true;
 
     if (!lr) {
         pr_debug("Ignoring regulatory request set by %s since last_request is not set\n",
              reg_initiator_name(initiator));
         return true;
     }
 
     if (initiator == NL80211_REGDOM_SET_BY_CORE &&
         wiphy->regulatory_flags & REGULATORY_CUSTOM_REG) {
         pr_debug("Ignoring regulatory request set by %s since the driver uses its own custom regulatory domain\n",
              reg_initiator_name(initiator));
         return true;
     }
 
     /*
      * wiphy->regd will be set once the device has its own
      * desired regulatory domain set
      */
     if (wiphy_strict_alpha2_regd(wiphy) && !wiphy->regd &&
         initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
         !is_world_regdom(lr->alpha2)) {
         pr_debug("Ignoring regulatory request set by %s since the driver requires its own regulatory domain to be set first\n",
              reg_initiator_name(initiator));
         return true;
     }
 
     if (reg_request_cell_base(lr))
         return reg_dev_ignore_cell_hint(wiphy);
 
     return false;
 }
 
 static bool reg_is_world_roaming(struct wiphy *wiphy)
 {
     const struct ieee80211_regdomain *cr = get_cfg80211_regdom();
     const struct ieee80211_regdomain *wr = get_wiphy_regdom(wiphy);
     struct regulatory_request *lr = get_last_request();
 
     if (is_world_regdom(cr->alpha2) || (wr && is_world_regdom(wr->alpha2)))
         return true;
 
     if (lr && lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE &&
         wiphy->regulatory_flags & REGULATORY_CUSTOM_REG)
         return true;
 
     return false;
 }
 
 static void handle_reg_beacon(struct wiphy *wiphy, unsigned int chan_idx,
                   struct reg_beacon *reg_beacon)
 {
     struct ieee80211_supported_band *sband;
     struct ieee80211_channel *chan;
     bool channel_changed = false;
     struct ieee80211_channel chan_before;
 
     sband = wiphy->bands[reg_beacon->chan.band];
     chan = &sband->channels[chan_idx];
 
     if (likely(!ieee80211_channel_equal(chan, &reg_beacon->chan)))
         return;
 
     if (chan->beacon_found)
         return;
 
     chan->beacon_found = true;
 
     if (!reg_is_world_roaming(wiphy))
         return;
 
     if (wiphy->regulatory_flags & REGULATORY_DISABLE_BEACON_HINTS)
         return;
 
     chan_before = *chan;
 
     if (chan->flags & IEEE80211_CHAN_NO_IR) {
         chan->flags &= ~IEEE80211_CHAN_NO_IR;
         channel_changed = true;
     }
 
     if (channel_changed)
         nl80211_send_beacon_hint_event(wiphy, &chan_before, chan);
 }
 
 /*
  * Called when a scan on a wiphy finds a beacon on
  * new channel
  */
 static void wiphy_update_new_beacon(struct wiphy *wiphy,
                     struct reg_beacon *reg_beacon)
 {
     unsigned int i;
     struct ieee80211_supported_band *sband;
 
     if (!wiphy->bands[reg_beacon->chan.band])
         return;
 
     sband = wiphy->bands[reg_beacon->chan.band];
 
     for (i = 0; i < sband->n_channels; i++)
         handle_reg_beacon(wiphy, i, reg_beacon);
 }
 
 /*
  * Called upon reg changes or a new wiphy is added
  */
 static void wiphy_update_beacon_reg(struct wiphy *wiphy)
 {
     unsigned int i;
     struct ieee80211_supported_band *sband;
     struct reg_beacon *reg_beacon;
 
     list_for_each_entry(reg_beacon, &reg_beacon_list, list) {
         if (!wiphy->bands[reg_beacon->chan.band])
             continue;
         sband = wiphy->bands[reg_beacon->chan.band];
         for (i = 0; i < sband->n_channels; i++)
             handle_reg_beacon(wiphy, i, reg_beacon);
     }
 }
 
 /* Reap the advantages of previously found beacons */
 static void reg_process_beacons(struct wiphy *wiphy)
 {
     /*
      * Means we are just firing up cfg80211, so no beacons would
      * have been processed yet.
      */
     if (!last_request)
         return;
     wiphy_update_beacon_reg(wiphy);
 }
 
 static bool is_ht40_allowed(struct ieee80211_channel *chan)
 {
     if (!chan)
         return false;
     if (chan->flags & IEEE80211_CHAN_DISABLED)
         return false;
     /* This would happen when regulatory rules disallow HT40 completely */
     if ((chan->flags & IEEE80211_CHAN_NO_HT40) == IEEE80211_CHAN_NO_HT40)
         return false;
     return true;
 }
 
 static void reg_process_ht_flags_channel(struct wiphy *wiphy,
                      struct ieee80211_channel *channel)
 {
     struct ieee80211_supported_band *sband = wiphy->bands[channel->band];
     struct ieee80211_channel *channel_before = NULL, *channel_after = NULL;
     const struct ieee80211_regdomain *regd;
     unsigned int i;
     u32 flags;
 
     if (!is_ht40_allowed(channel)) {
         channel->flags |= IEEE80211_CHAN_NO_HT40;
         return;
     }
 
     /*
      * We need to ensure the extension channels exist to
      * be able to use HT40- or HT40+, this finds them (or not)
      */
     for (i = 0; i < sband->n_channels; i++) {
         struct ieee80211_channel *c = &sband->channels[i];
 
         if (c->center_freq == (channel->center_freq - 20))
             channel_before = c;
         if (c->center_freq == (channel->center_freq + 20))
             channel_after = c;
     }
 
     flags = 0;
     regd = get_wiphy_regdom(wiphy);
     if (regd) {
         const struct ieee80211_reg_rule *reg_rule =
             freq_reg_info_regd(MHZ_TO_KHZ(channel->center_freq),
                        regd, MHZ_TO_KHZ(20));
 
         if (!IS_ERR(reg_rule))
             flags = reg_rule->flags;
     }
 
     /*
      * Please note that this assumes target bandwidth is 20 MHz,
      * if that ever changes we also need to change the below logic
      * to include that as well.
      */
     if (!is_ht40_allowed(channel_before) ||
         flags & NL80211_RRF_NO_HT40MINUS)
         channel->flags |= IEEE80211_CHAN_NO_HT40MINUS;
     else
         channel->flags &= ~IEEE80211_CHAN_NO_HT40MINUS;
 
     if (!is_ht40_allowed(channel_after) ||
         flags & NL80211_RRF_NO_HT40PLUS)
         channel->flags |= IEEE80211_CHAN_NO_HT40PLUS;
     else
         channel->flags &= ~IEEE80211_CHAN_NO_HT40PLUS;
 }
 
 static void reg_process_ht_flags_band(struct wiphy *wiphy,
                       struct ieee80211_supported_band *sband)
 {
     unsigned int i;
 
     if (!sband)
         return;
 
     for (i = 0; i < sband->n_channels; i++)
         reg_process_ht_flags_channel(wiphy, &sband->channels[i]);
 }
 
 static void reg_process_ht_flags(struct wiphy *wiphy)
 {
     enum nl80211_band band;
 
     if (!wiphy)
         return;
 
     for (band = 0; band < NUM_NL80211_BANDS; band++)
         reg_process_ht_flags_band(wiphy, wiphy->bands[band]);
 }
 
 static void reg_call_notifier(struct wiphy *wiphy,
                   struct regulatory_request *request)
 {
     if (wiphy->reg_notifier)
         wiphy->reg_notifier(wiphy, request);
 }
 
 static bool reg_wdev_chan_valid(struct wiphy *wiphy, struct wireless_dev *wdev)
 {
     struct cfg80211_chan_def chandef = {};
     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
     enum nl80211_iftype iftype;
     bool ret;
     int link;
 
     wdev_lock(wdev);
     iftype = wdev->iftype;
 
     /* make sure the interface is active */
     if (!wdev->netdev || !netif_running(wdev->netdev))
         goto wdev_inactive_unlock;
 
     for (link = 0; link < ARRAY_SIZE(wdev->links); link++) {
         struct ieee80211_channel *chan;
 
         if (!wdev->valid_links && link > 0)
             break;
         if (!(wdev->valid_links & BIT(link)))
             continue;
         switch (iftype) {
         case NL80211_IFTYPE_AP:
         case NL80211_IFTYPE_P2P_GO:
         case NL80211_IFTYPE_MESH_POINT:
             if (!wdev->u.mesh.beacon_interval)
                 continue;
             chandef = wdev->u.mesh.chandef;
             break;
         case NL80211_IFTYPE_ADHOC:
             if (!wdev->u.ibss.ssid_len)
                 continue;
             chandef = wdev->u.ibss.chandef;
             break;
         case NL80211_IFTYPE_STATION:
         case NL80211_IFTYPE_P2P_CLIENT:
             /* Maybe we could consider disabling that link only? */
             if (!wdev->links[link].client.current_bss)
                 continue;
 
             chan = wdev->links[link].client.current_bss->pub.channel;
             if (!chan)
                 continue;
 
             if (!rdev->ops->get_channel ||
                 rdev_get_channel(rdev, wdev, link, &chandef))
                 cfg80211_chandef_create(&chandef, chan,
                             NL80211_CHAN_NO_HT);
             break;
         case NL80211_IFTYPE_MONITOR:
         case NL80211_IFTYPE_AP_VLAN:
         case NL80211_IFTYPE_P2P_DEVICE:
             /* no enforcement required */
             break;
         default:
             /* others not implemented for now */
             WARN_ON(1);
             break;
         }
 
         wdev_unlock(wdev);
 
         switch (iftype) {
         case NL80211_IFTYPE_AP:
         case NL80211_IFTYPE_P2P_GO:
         case NL80211_IFTYPE_ADHOC:
         case NL80211_IFTYPE_MESH_POINT:
             wiphy_lock(wiphy);
             ret = cfg80211_reg_can_beacon_relax(wiphy, &chandef,
                                 iftype);
             wiphy_unlock(wiphy);
 
             if (!ret)
                 return ret;
             break;
         case NL80211_IFTYPE_STATION:
         case NL80211_IFTYPE_P2P_CLIENT:
             ret = cfg80211_chandef_usable(wiphy, &chandef,
                               IEEE80211_CHAN_DISABLED);
             if (!ret)
                 return ret;
             break;
         default:
             break;
         }
 
         wdev_lock(wdev);
     }
 
     wdev_unlock(wdev);
 
     return true;
 
 wdev_inactive_unlock:
     wdev_unlock(wdev);
     return true;
 }
 
 static void reg_leave_invalid_chans(struct wiphy *wiphy)
 {
     struct wireless_dev *wdev;
     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 
     ASSERT_RTNL();
 
     list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
         if (!reg_wdev_chan_valid(wiphy, wdev))
             cfg80211_leave(rdev, wdev);
 }
 
 static void reg_check_chans_work(struct work_struct *work)
 {
     struct cfg80211_registered_device *rdev;
 
     pr_debug("Verifying active interfaces after reg change\n");
     rtnl_lock();
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list)
         if (!(rdev->wiphy.regulatory_flags &
               REGULATORY_IGNORE_STALE_KICKOFF))
             reg_leave_invalid_chans(&rdev->wiphy);
 
     rtnl_unlock();
 }
 
 static void reg_check_channels(void)
 {
     /*
      * Give usermode a chance to do something nicer (move to another
      * channel, orderly disconnection), before forcing a disconnection.
      */
     mod_delayed_work(system_power_efficient_wq,
              &reg_check_chans,
              msecs_to_jiffies(REG_ENFORCE_GRACE_MS));
 }
 
 static void wiphy_update_regulatory(struct wiphy *wiphy,
                     enum nl80211_reg_initiator initiator)
 {
     enum nl80211_band band;
     struct regulatory_request *lr = get_last_request();
 
     if (ignore_reg_update(wiphy, initiator)) {
         /*
          * Regulatory updates set by CORE are ignored for custom
          * regulatory cards. Let us notify the changes to the driver,
          * as some drivers used this to restore its orig_* reg domain.
          */
         if (initiator == NL80211_REGDOM_SET_BY_CORE &&
             wiphy->regulatory_flags & REGULATORY_CUSTOM_REG &&
             !(wiphy->regulatory_flags &
               REGULATORY_WIPHY_SELF_MANAGED))
             reg_call_notifier(wiphy, lr);
         return;
     }
 
     lr->dfs_region = get_cfg80211_regdom()->dfs_region;
 
     for (band = 0; band < NUM_NL80211_BANDS; band++)
         handle_band(wiphy, initiator, wiphy->bands[band]);
 
     reg_process_beacons(wiphy);
     reg_process_ht_flags(wiphy);
     reg_call_notifier(wiphy, lr);
 }
 
 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator)
 {
     struct cfg80211_registered_device *rdev;
     struct wiphy *wiphy;
 
     ASSERT_RTNL();
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         wiphy = &rdev->wiphy;
         wiphy_update_regulatory(wiphy, initiator);
     }
 
     reg_check_channels();
 }
 
 static void handle_channel_custom(struct wiphy *wiphy,
                   struct ieee80211_channel *chan,
                   const struct ieee80211_regdomain *regd,
                   u32 min_bw)
 {
     u32 bw_flags = 0;
     const struct ieee80211_reg_rule *reg_rule = NULL;
     const struct ieee80211_power_rule *power_rule = NULL;
     u32 bw, center_freq_khz;
 
     center_freq_khz = ieee80211_channel_to_khz(chan);
     for (bw = MHZ_TO_KHZ(20); bw >= min_bw; bw = bw / 2) {
         reg_rule = freq_reg_info_regd(center_freq_khz, regd, bw);
         if (!IS_ERR(reg_rule))
             break;
     }
 
     if (IS_ERR_OR_NULL(reg_rule)) {
         pr_debug("Disabling freq %d.%03d MHz as custom regd has no rule that fits it\n",
              chan->center_freq, chan->freq_offset);
         if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
             chan->flags |= IEEE80211_CHAN_DISABLED;
         } else {
             chan->orig_flags |= IEEE80211_CHAN_DISABLED;
             chan->flags = chan->orig_flags;
         }
         return;
     }
 
     power_rule = &reg_rule->power_rule;
     bw_flags = reg_rule_to_chan_bw_flags(regd, reg_rule, chan);
 
     chan->dfs_state_entered = jiffies;
     chan->dfs_state = NL80211_DFS_USABLE;
 
     chan->beacon_found = false;
 
     if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
         chan->flags = chan->orig_flags | bw_flags |
                   map_regdom_flags(reg_rule->flags);
     else
         chan->flags |= map_regdom_flags(reg_rule->flags) | bw_flags;
 
     chan->max_antenna_gain = (int) MBI_TO_DBI(power_rule->max_antenna_gain);
     chan->max_reg_power = chan->max_power =
         (int) MBM_TO_DBM(power_rule->max_eirp);
 
     if (chan->flags & IEEE80211_CHAN_RADAR) {
         if (reg_rule->dfs_cac_ms)
             chan->dfs_cac_ms = reg_rule->dfs_cac_ms;
         else
             chan->dfs_cac_ms = IEEE80211_DFS_MIN_CAC_TIME_MS;
     }
 
     chan->max_power = chan->max_reg_power;
 }
 
 static void handle_band_custom(struct wiphy *wiphy,
                    struct ieee80211_supported_band *sband,
                    const struct ieee80211_regdomain *regd)
 {
     unsigned int i;
 
     if (!sband)
         return;
 
     /*
      * We currently assume that you always want at least 20 MHz,
      * otherwise channel 12 might get enabled if this rule is
      * compatible to US, which permits 2402 - 2472 MHz.
      */
     for (i = 0; i < sband->n_channels; i++)
         handle_channel_custom(wiphy, &sband->channels[i], regd,
                       MHZ_TO_KHZ(20));
 }
 
 /* Used by drivers prior to wiphy registration */
 void wiphy_apply_custom_regulatory(struct wiphy *wiphy,
                    const struct ieee80211_regdomain *regd)
 {
     const struct ieee80211_regdomain *new_regd, *tmp;
     enum nl80211_band band;
     unsigned int bands_set = 0;
 
     WARN(!(wiphy->regulatory_flags & REGULATORY_CUSTOM_REG),
          "wiphy should have REGULATORY_CUSTOM_REG\n");
     wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
 
     for (band = 0; band < NUM_NL80211_BANDS; band++) {
         if (!wiphy->bands[band])
             continue;
         handle_band_custom(wiphy, wiphy->bands[band], regd);
         bands_set++;
     }
 
     /*
      * no point in calling this if it won't have any effect
      * on your device's supported bands.
      */
     WARN_ON(!bands_set);
     new_regd = reg_copy_regd(regd);
     if (IS_ERR(new_regd))
         return;
 
     rtnl_lock();
     wiphy_lock(wiphy);
 
     tmp = get_wiphy_regdom(wiphy);
     rcu_assign_pointer(wiphy->regd, new_regd);
     rcu_free_regdom(tmp);
 
     wiphy_unlock(wiphy);
     rtnl_unlock();
 }
 EXPORT_SYMBOL(wiphy_apply_custom_regulatory);
 
 static void reg_set_request_processed(void)
 {
     bool need_more_processing = false;
     struct regulatory_request *lr = get_last_request();
 
     lr->processed = true;
 
     spin_lock(&reg_requests_lock);
     if (!list_empty(&reg_requests_list))
         need_more_processing = true;
     spin_unlock(&reg_requests_lock);
 
     cancel_crda_timeout();
 
     if (need_more_processing)
         schedule_work(&reg_work);
 }
 
 /**
  * reg_process_hint_core - process core regulatory requests
  * @core_request: a pending core regulatory request
  *
  * The wireless subsystem can use this function to process
  * a regulatory request issued by the regulatory core.
  */
 static enum reg_request_treatment
 reg_process_hint_core(struct regulatory_request *core_request)
 {
     if (reg_query_database(core_request)) {
         core_request->intersect = false;
         core_request->processed = false;
         reg_update_last_request(core_request);
         return REG_REQ_OK;
     }
 
     return REG_REQ_IGNORE;
 }
 
 static enum reg_request_treatment
 __reg_process_hint_user(struct regulatory_request *user_request)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (reg_request_cell_base(user_request))
         return reg_ignore_cell_hint(user_request);
 
     if (reg_request_cell_base(lr))
         return REG_REQ_IGNORE;
 
     if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE)
         return REG_REQ_INTERSECT;
     /*
      * If the user knows better the user should set the regdom
      * to their country before the IE is picked up
      */
     if (lr->initiator == NL80211_REGDOM_SET_BY_USER &&
         lr->intersect)
         return REG_REQ_IGNORE;
     /*
      * Process user requests only after previous user/driver/core
      * requests have been processed
      */
     if ((lr->initiator == NL80211_REGDOM_SET_BY_CORE ||
          lr->initiator == NL80211_REGDOM_SET_BY_DRIVER ||
          lr->initiator == NL80211_REGDOM_SET_BY_USER) &&
         regdom_changes(lr->alpha2))
         return REG_REQ_IGNORE;
 
     if (!regdom_changes(user_request->alpha2))
         return REG_REQ_ALREADY_SET;
 
     return REG_REQ_OK;
 }
 
 /**
  * reg_process_hint_user - process user regulatory requests
  * @user_request: a pending user regulatory request
  *
  * The wireless subsystem can use this function to process
  * a regulatory request initiated by userspace.
  */
 static enum reg_request_treatment
 reg_process_hint_user(struct regulatory_request *user_request)
 {
     enum reg_request_treatment treatment;
 
     treatment = __reg_process_hint_user(user_request);
     if (treatment == REG_REQ_IGNORE ||
         treatment == REG_REQ_ALREADY_SET)
         return REG_REQ_IGNORE;
 
     user_request->intersect = treatment == REG_REQ_INTERSECT;
     user_request->processed = false;
 
     if (reg_query_database(user_request)) {
         reg_update_last_request(user_request);
         user_alpha2[0] = user_request->alpha2[0];
         user_alpha2[1] = user_request->alpha2[1];
         return REG_REQ_OK;
     }
 
     return REG_REQ_IGNORE;
 }
 
 static enum reg_request_treatment
 __reg_process_hint_driver(struct regulatory_request *driver_request)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (lr->initiator == NL80211_REGDOM_SET_BY_CORE) {
         if (regdom_changes(driver_request->alpha2))
             return REG_REQ_OK;
         return REG_REQ_ALREADY_SET;
     }
 
     /*
      * This would happen if you unplug and plug your card
      * back in or if you add a new device for which the previously
      * loaded card also agrees on the regulatory domain.
      */
     if (lr->initiator == NL80211_REGDOM_SET_BY_DRIVER &&
         !regdom_changes(driver_request->alpha2))
         return REG_REQ_ALREADY_SET;
 
     return REG_REQ_INTERSECT;
 }
 
 /**
  * reg_process_hint_driver - process driver regulatory requests
  * @wiphy: the wireless device for the regulatory request
  * @driver_request: a pending driver regulatory request
  *
  * The wireless subsystem can use this function to process
  * a regulatory request issued by an 802.11 driver.
  *
  * Returns one of the different reg request treatment values.
  */
 static enum reg_request_treatment
 reg_process_hint_driver(struct wiphy *wiphy,
             struct regulatory_request *driver_request)
 {
     const struct ieee80211_regdomain *regd, *tmp;
     enum reg_request_treatment treatment;
 
     treatment = __reg_process_hint_driver(driver_request);
 
     switch (treatment) {
     case REG_REQ_OK:
         break;
     case REG_REQ_IGNORE:
         return REG_REQ_IGNORE;
     case REG_REQ_INTERSECT:
     case REG_REQ_ALREADY_SET:
         regd = reg_copy_regd(get_cfg80211_regdom());
         if (IS_ERR(regd))
             return REG_REQ_IGNORE;
 
         tmp = get_wiphy_regdom(wiphy);
         ASSERT_RTNL();
         wiphy_lock(wiphy);
         rcu_assign_pointer(wiphy->regd, regd);
         wiphy_unlock(wiphy);
         rcu_free_regdom(tmp);
     }
 
 
     driver_request->intersect = treatment == REG_REQ_INTERSECT;
     driver_request->processed = false;
 
     /*
      * Since CRDA will not be called in this case as we already
      * have applied the requested regulatory domain before we just
      * inform userspace we have processed the request
      */
     if (treatment == REG_REQ_ALREADY_SET) {
         nl80211_send_reg_change_event(driver_request);
         reg_update_last_request(driver_request);
         reg_set_request_processed();
         return REG_REQ_ALREADY_SET;
     }
 
     if (reg_query_database(driver_request)) {
         reg_update_last_request(driver_request);
         return REG_REQ_OK;
     }
 
     return REG_REQ_IGNORE;
 }
 
 static enum reg_request_treatment
 __reg_process_hint_country_ie(struct wiphy *wiphy,
                   struct regulatory_request *country_ie_request)
 {
     struct wiphy *last_wiphy = NULL;
     struct regulatory_request *lr = get_last_request();
 
     if (reg_request_cell_base(lr)) {
         /* Trust a Cell base station over the AP's country IE */
         if (regdom_changes(country_ie_request->alpha2))
             return REG_REQ_IGNORE;
         return REG_REQ_ALREADY_SET;
     } else {
         if (wiphy->regulatory_flags & REGULATORY_COUNTRY_IE_IGNORE)
             return REG_REQ_IGNORE;
     }
 
     if (unlikely(!is_an_alpha2(country_ie_request->alpha2)))
         return -EINVAL;
 
     if (lr->initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE)
         return REG_REQ_OK;
 
     last_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
 
     if (last_wiphy != wiphy) {
         /*
          * Two cards with two APs claiming different
          * Country IE alpha2s. We could
          * intersect them, but that seems unlikely
          * to be correct. Reject second one for now.
          */
         if (regdom_changes(country_ie_request->alpha2))
             return REG_REQ_IGNORE;
         return REG_REQ_ALREADY_SET;
     }
 
     if (regdom_changes(country_ie_request->alpha2))
         return REG_REQ_OK;
     return REG_REQ_ALREADY_SET;
 }
 
 /**
  * reg_process_hint_country_ie - process regulatory requests from country IEs
  * @wiphy: the wireless device for the regulatory request
  * @country_ie_request: a regulatory request from a country IE
  *
  * The wireless subsystem can use this function to process
  * a regulatory request issued by a country Information Element.
  *
  * Returns one of the different reg request treatment values.
  */
 static enum reg_request_treatment
 reg_process_hint_country_ie(struct wiphy *wiphy,
                 struct regulatory_request *country_ie_request)
 {
     enum reg_request_treatment treatment;
 
     treatment = __reg_process_hint_country_ie(wiphy, country_ie_request);
 
     switch (treatment) {
     case REG_REQ_OK:
         break;
     case REG_REQ_IGNORE:
         return REG_REQ_IGNORE;
     case REG_REQ_ALREADY_SET:
         reg_free_request(country_ie_request);
         return REG_REQ_ALREADY_SET;
     case REG_REQ_INTERSECT:
         /*
          * This doesn't happen yet, not sure we
          * ever want to support it for this case.
          */
         WARN_ONCE(1, "Unexpected intersection for country elements");
         return REG_REQ_IGNORE;
     }
 
     country_ie_request->intersect = false;
     country_ie_request->processed = false;
 
     if (reg_query_database(country_ie_request)) {
         reg_update_last_request(country_ie_request);
         return REG_REQ_OK;
     }
 
     return REG_REQ_IGNORE;
 }
 
 bool reg_dfs_domain_same(struct wiphy *wiphy1, struct wiphy *wiphy2)
 {
     const struct ieee80211_regdomain *wiphy1_regd = NULL;
     const struct ieee80211_regdomain *wiphy2_regd = NULL;
     const struct ieee80211_regdomain *cfg80211_regd = NULL;
     bool dfs_domain_same;
 
     rcu_read_lock();
 
     cfg80211_regd = rcu_dereference(cfg80211_regdomain);
     wiphy1_regd = rcu_dereference(wiphy1->regd);
     if (!wiphy1_regd)
         wiphy1_regd = cfg80211_regd;
 
     wiphy2_regd = rcu_dereference(wiphy2->regd);
     if (!wiphy2_regd)
         wiphy2_regd = cfg80211_regd;
 
     dfs_domain_same = wiphy1_regd->dfs_region == wiphy2_regd->dfs_region;
 
     rcu_read_unlock();
 
     return dfs_domain_same;
 }
 
 static void reg_copy_dfs_chan_state(struct ieee80211_channel *dst_chan,
                     struct ieee80211_channel *src_chan)
 {
     if (!(dst_chan->flags & IEEE80211_CHAN_RADAR) ||
         !(src_chan->flags & IEEE80211_CHAN_RADAR))
         return;
 
     if (dst_chan->flags & IEEE80211_CHAN_DISABLED ||
         src_chan->flags & IEEE80211_CHAN_DISABLED)
         return;
 
     if (src_chan->center_freq == dst_chan->center_freq &&
         dst_chan->dfs_state == NL80211_DFS_USABLE) {
         dst_chan->dfs_state = src_chan->dfs_state;
         dst_chan->dfs_state_entered = src_chan->dfs_state_entered;
     }
 }
 
 static void wiphy_share_dfs_chan_state(struct wiphy *dst_wiphy,
                        struct wiphy *src_wiphy)
 {
     struct ieee80211_supported_band *src_sband, *dst_sband;
     struct ieee80211_channel *src_chan, *dst_chan;
     int i, j, band;
 
     if (!reg_dfs_domain_same(dst_wiphy, src_wiphy))
         return;
 
     for (band = 0; band < NUM_NL80211_BANDS; band++) {
         dst_sband = dst_wiphy->bands[band];
         src_sband = src_wiphy->bands[band];
         if (!dst_sband || !src_sband)
             continue;
 
         for (i = 0; i < dst_sband->n_channels; i++) {
             dst_chan = &dst_sband->channels[i];
             for (j = 0; j < src_sband->n_channels; j++) {
                 src_chan = &src_sband->channels[j];
                 reg_copy_dfs_chan_state(dst_chan, src_chan);
             }
         }
     }
 }
 
 static void wiphy_all_share_dfs_chan_state(struct wiphy *wiphy)
 {
     struct cfg80211_registered_device *rdev;
 
     ASSERT_RTNL();
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         if (wiphy == &rdev->wiphy)
             continue;
         wiphy_share_dfs_chan_state(wiphy, &rdev->wiphy);
     }
 }
 
 /* This processes *all* regulatory hints */
 static void reg_process_hint(struct regulatory_request *reg_request)
 {
     struct wiphy *wiphy = NULL;
     enum reg_request_treatment treatment;
     enum nl80211_reg_initiator initiator = reg_request->initiator;
 
     if (reg_request->wiphy_idx != WIPHY_IDX_INVALID)
         wiphy = wiphy_idx_to_wiphy(reg_request->wiphy_idx);
 
     switch (initiator) {
     case NL80211_REGDOM_SET_BY_CORE:
         treatment = reg_process_hint_core(reg_request);
         break;
     case NL80211_REGDOM_SET_BY_USER:
         treatment = reg_process_hint_user(reg_request);
         break;
     case NL80211_REGDOM_SET_BY_DRIVER:
         if (!wiphy)
             goto out_free;
         treatment = reg_process_hint_driver(wiphy, reg_request);
         break;
     case NL80211_REGDOM_SET_BY_COUNTRY_IE:
         if (!wiphy)
             goto out_free;
         treatment = reg_process_hint_country_ie(wiphy, reg_request);
         break;
     default:
         WARN(1, "invalid initiator %d\n", initiator);
         goto out_free;
     }
 
     if (treatment == REG_REQ_IGNORE)
         goto out_free;
 
     WARN(treatment != REG_REQ_OK && treatment != REG_REQ_ALREADY_SET,
          "unexpected treatment value %d\n", treatment);
 
     /* This is required so that the orig_* parameters are saved.
      * NOTE: treatment must be set for any case that reaches here!
      */
     if (treatment == REG_REQ_ALREADY_SET && wiphy &&
         wiphy->regulatory_flags & REGULATORY_STRICT_REG) {
         wiphy_update_regulatory(wiphy, initiator);
         wiphy_all_share_dfs_chan_state(wiphy);
         reg_check_channels();
     }
 
     return;
 
 out_free:
     reg_free_request(reg_request);
 }
 
 static void notify_self_managed_wiphys(struct regulatory_request *request)
 {
     struct cfg80211_registered_device *rdev;
     struct wiphy *wiphy;
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         wiphy = &rdev->wiphy;
         if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED &&
             request->initiator == NL80211_REGDOM_SET_BY_USER)
             reg_call_notifier(wiphy, request);
     }
 }
 
 /*
  * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
  * Regulatory hints come on a first come first serve basis and we
  * must process each one atomically.
  */
 static void reg_process_pending_hints(void)
 {
     struct regulatory_request *reg_request, *lr;
 
     lr = get_last_request();
 
     /* When last_request->processed becomes true this will be rescheduled */
     if (lr && !lr->processed) {
         pr_debug("Pending regulatory request, waiting for it to be processed...\n");
         return;
     }
 
     spin_lock(&reg_requests_lock);
 
     if (list_empty(&reg_requests_list)) {
         spin_unlock(&reg_requests_lock);
         return;
     }
 
     reg_request = list_first_entry(&reg_requests_list,
                        struct regulatory_request,
                        list);
     list_del_init(&reg_request->list);
 
     spin_unlock(&reg_requests_lock);
 
     notify_self_managed_wiphys(reg_request);
 
     reg_process_hint(reg_request);
 
     lr = get_last_request();
 
     spin_lock(&reg_requests_lock);
     if (!list_empty(&reg_requests_list) && lr && lr->processed)
         schedule_work(&reg_work);
     spin_unlock(&reg_requests_lock);
 }
 
 /* Processes beacon hints -- this has nothing to do with country IEs */
 static void reg_process_pending_beacon_hints(void)
 {
     struct cfg80211_registered_device *rdev;
     struct reg_beacon *pending_beacon, *tmp;
 
     /* This goes through the _pending_ beacon list */
     spin_lock_bh(&reg_pending_beacons_lock);
 
     list_for_each_entry_safe(pending_beacon, tmp,
                  &reg_pending_beacons, list) {
         list_del_init(&pending_beacon->list);
 
         /* Applies the beacon hint to current wiphys */
         list_for_each_entry(rdev, &cfg80211_rdev_list, list)
             wiphy_update_new_beacon(&rdev->wiphy, pending_beacon);
 
         /* Remembers the beacon hint for new wiphys or reg changes */
         list_add_tail(&pending_beacon->list, &reg_beacon_list);
     }
 
     spin_unlock_bh(&reg_pending_beacons_lock);
 }
 
 static void reg_process_self_managed_hint(struct wiphy *wiphy)
 {
     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
     const struct ieee80211_regdomain *tmp;
     const struct ieee80211_regdomain *regd;
     enum nl80211_band band;
     struct regulatory_request request = {};
 
     ASSERT_RTNL();
     lockdep_assert_wiphy(wiphy);
 
     spin_lock(&reg_requests_lock);
     regd = rdev->requested_regd;
     rdev->requested_regd = NULL;
     spin_unlock(&reg_requests_lock);
 
     if (!regd)
         return;
 
     tmp = get_wiphy_regdom(wiphy);
     rcu_assign_pointer(wiphy->regd, regd);
     rcu_free_regdom(tmp);
 
     for (band = 0; band < NUM_NL80211_BANDS; band++)
         handle_band_custom(wiphy, wiphy->bands[band], regd);
 
     reg_process_ht_flags(wiphy);
 
     request.wiphy_idx = get_wiphy_idx(wiphy);
     request.alpha2[0] = regd->alpha2[0];
     request.alpha2[1] = regd->alpha2[1];
     request.initiator = NL80211_REGDOM_SET_BY_DRIVER;
 
     nl80211_send_wiphy_reg_change_event(&request);
 }
 
 static void reg_process_self_managed_hints(void)
 {
     struct cfg80211_registered_device *rdev;
 
     ASSERT_RTNL();
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         wiphy_lock(&rdev->wiphy);
         reg_process_self_managed_hint(&rdev->wiphy);
         wiphy_unlock(&rdev->wiphy);
     }
 
     reg_check_channels();
 }
 
 static void reg_todo(struct work_struct *work)
 {
     rtnl_lock();
     reg_process_pending_hints();
     reg_process_pending_beacon_hints();
     reg_process_self_managed_hints();
     rtnl_unlock();
 }
 
 static void queue_regulatory_request(struct regulatory_request *request)
 {
     request->alpha2[0] = toupper(request->alpha2[0]);
     request->alpha2[1] = toupper(request->alpha2[1]);
 
     spin_lock(&reg_requests_lock);
     list_add_tail(&request->list, &reg_requests_list);
     spin_unlock(&reg_requests_lock);
 
     schedule_work(&reg_work);
 }
 
 /*
  * Core regulatory hint -- happens during cfg80211_init()
  * and when we restore regulatory settings.
  */
 static int regulatory_hint_core(const char *alpha2)
 {
     struct regulatory_request *request;
 
     request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
     if (!request)
         return -ENOMEM;
 
     request->alpha2[0] = alpha2[0];
     request->alpha2[1] = alpha2[1];
     request->initiator = NL80211_REGDOM_SET_BY_CORE;
     request->wiphy_idx = WIPHY_IDX_INVALID;
 
     queue_regulatory_request(request);
 
     return 0;
 }
 
 /* User hints */
 int regulatory_hint_user(const char *alpha2,
              enum nl80211_user_reg_hint_type user_reg_hint_type)
 {
     struct regulatory_request *request;
 
     if (WARN_ON(!alpha2))
         return -EINVAL;
 
     if (!is_world_regdom(alpha2) && !is_an_alpha2(alpha2))
         return -EINVAL;
 
     request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
     if (!request)
         return -ENOMEM;
 
     request->wiphy_idx = WIPHY_IDX_INVALID;
     request->alpha2[0] = alpha2[0];
     request->alpha2[1] = alpha2[1];
     request->initiator = NL80211_REGDOM_SET_BY_USER;
     request->user_reg_hint_type = user_reg_hint_type;
 
     /* Allow calling CRDA again */
     reset_crda_timeouts();
 
     queue_regulatory_request(request);
 
     return 0;
 }
 
 int regulatory_hint_indoor(bool is_indoor, u32 portid)
 {
     spin_lock(&reg_indoor_lock);
 
     /* It is possible that more than one user space process is trying to
      * configure the indoor setting. To handle such cases, clear the indoor
      * setting in case that some process does not think that the device
      * is operating in an indoor environment. In addition, if a user space
      * process indicates that it is controlling the indoor setting, save its
      * portid, i.e., make it the owner.
      */
     reg_is_indoor = is_indoor;
     if (reg_is_indoor) {
         if (!reg_is_indoor_portid)
             reg_is_indoor_portid = portid;
     } else {
         reg_is_indoor_portid = 0;
     }
 
     spin_unlock(&reg_indoor_lock);
 
     if (!is_indoor)
         reg_check_channels();
 
     return 0;
 }
 
 void regulatory_netlink_notify(u32 portid)
 {
     spin_lock(&reg_indoor_lock);
 
     if (reg_is_indoor_portid != portid) {
         spin_unlock(&reg_indoor_lock);
         return;
     }
 
     reg_is_indoor = false;
     reg_is_indoor_portid = 0;
 
     spin_unlock(&reg_indoor_lock);
 
     reg_check_channels();
 }
 
 /* Driver hints */
 int regulatory_hint(struct wiphy *wiphy, const char *alpha2)
 {
     struct regulatory_request *request;
 
     if (WARN_ON(!alpha2 || !wiphy))
         return -EINVAL;
 
     wiphy->regulatory_flags &= ~REGULATORY_CUSTOM_REG;
 
     request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
     if (!request)
         return -ENOMEM;
 
     request->wiphy_idx = get_wiphy_idx(wiphy);
 
     request->alpha2[0] = alpha2[0];
     request->alpha2[1] = alpha2[1];
     request->initiator = NL80211_REGDOM_SET_BY_DRIVER;
 
     /* Allow calling CRDA again */
     reset_crda_timeouts();
 
     queue_regulatory_request(request);
 
     return 0;
 }
 EXPORT_SYMBOL(regulatory_hint);
 
 void regulatory_hint_country_ie(struct wiphy *wiphy, enum nl80211_band band,
                 const u8 *country_ie, u8 country_ie_len)
 {
     char alpha2[2];
     enum environment_cap env = ENVIRON_ANY;
     struct regulatory_request *request = NULL, *lr;
 
     /* IE len must be evenly divisible by 2 */
     if (country_ie_len & 0x01)
         return;
 
     if (country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
         return;
 
     request = kzalloc(sizeof(*request), GFP_KERNEL);
     if (!request)
         return;
 
     alpha2[0] = country_ie[0];
     alpha2[1] = country_ie[1];
 
     if (country_ie[2] == 'I')
         env = ENVIRON_INDOOR;
     else if (country_ie[2] == 'O')
         env = ENVIRON_OUTDOOR;
 
     rcu_read_lock();
     lr = get_last_request();
 
     if (unlikely(!lr))
         goto out;
 
     /*
      * We will run this only upon a successful connection on cfg80211.
      * We leave conflict resolution to the workqueue, where can hold
      * the RTNL.
      */
     if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
         lr->wiphy_idx != WIPHY_IDX_INVALID)
         goto out;
 
     request->wiphy_idx = get_wiphy_idx(wiphy);
     request->alpha2[0] = alpha2[0];
     request->alpha2[1] = alpha2[1];
     request->initiator = NL80211_REGDOM_SET_BY_COUNTRY_IE;
     request->country_ie_env = env;
 
     /* Allow calling CRDA again */
     reset_crda_timeouts();
 
     queue_regulatory_request(request);
     request = NULL;
 out:
     kfree(request);
     rcu_read_unlock();
 }
 
 static void restore_alpha2(char *alpha2, bool reset_user)
 {
     /* indicates there is no alpha2 to consider for restoration */
     alpha2[0] = '9';
     alpha2[1] = '7';
 
     /* The user setting has precedence over the module parameter */
     if (is_user_regdom_saved()) {
         /* Unless we're asked to ignore it and reset it */
         if (reset_user) {
             pr_debug("Restoring regulatory settings including user preference\n");
             user_alpha2[0] = '9';
             user_alpha2[1] = '7';
 
             /*
              * If we're ignoring user settings, we still need to
              * check the module parameter to ensure we put things
              * back as they were for a full restore.
              */
             if (!is_world_regdom(ieee80211_regdom)) {
                 pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
                      ieee80211_regdom[0], ieee80211_regdom[1]);
                 alpha2[0] = ieee80211_regdom[0];
                 alpha2[1] = ieee80211_regdom[1];
             }
         } else {
             pr_debug("Restoring regulatory settings while preserving user preference for: %c%c\n",
                  user_alpha2[0], user_alpha2[1]);
             alpha2[0] = user_alpha2[0];
             alpha2[1] = user_alpha2[1];
         }
     } else if (!is_world_regdom(ieee80211_regdom)) {
         pr_debug("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
              ieee80211_regdom[0], ieee80211_regdom[1]);
         alpha2[0] = ieee80211_regdom[0];
         alpha2[1] = ieee80211_regdom[1];
     } else
         pr_debug("Restoring regulatory settings\n");
 }
 
 static void restore_custom_reg_settings(struct wiphy *wiphy)
 {
     struct ieee80211_supported_band *sband;
     enum nl80211_band band;
     struct ieee80211_channel *chan;
     int i;
 
     for (band = 0; band < NUM_NL80211_BANDS; band++) {
         sband = wiphy->bands[band];
         if (!sband)
             continue;
         for (i = 0; i < sband->n_channels; i++) {
             chan = &sband->channels[i];
             chan->flags = chan->orig_flags;
             chan->max_antenna_gain = chan->orig_mag;
             chan->max_power = chan->orig_mpwr;
             chan->beacon_found = false;
         }
     }
 }
 
 /*
  * Restoring regulatory settings involves ignoring any
  * possibly stale country IE information and user regulatory
  * settings if so desired, this includes any beacon hints
  * learned as we could have traveled outside to another country
  * after disconnection. To restore regulatory settings we do
  * exactly what we did at bootup:
  *
  *   - send a core regulatory hint
  *   - send a user regulatory hint if applicable
  *
  * Device drivers that send a regulatory hint for a specific country
  * keep their own regulatory domain on wiphy->regd so that does
  * not need to be remembered.
  */
 static void restore_regulatory_settings(bool reset_user, bool cached)
 {
     char alpha2[2];
     char world_alpha2[2];
     struct reg_beacon *reg_beacon, *btmp;
     LIST_HEAD(tmp_reg_req_list);
     struct cfg80211_registered_device *rdev;
 
     ASSERT_RTNL();
 
     /*
      * Clear the indoor setting in case that it is not controlled by user
      * space, as otherwise there is no guarantee that the device is still
      * operating in an indoor environment.
      */
     spin_lock(&reg_indoor_lock);
     if (reg_is_indoor && !reg_is_indoor_portid) {
         reg_is_indoor = false;
         reg_check_channels();
     }
     spin_unlock(&reg_indoor_lock);
 
     reset_regdomains(true, &world_regdom);
     restore_alpha2(alpha2, reset_user);
 
     /*
      * If there's any pending requests we simply
      * stash them to a temporary pending queue and
      * add then after we've restored regulatory
      * settings.
      */
     spin_lock(&reg_requests_lock);
     list_splice_tail_init(&reg_requests_list, &tmp_reg_req_list);
     spin_unlock(&reg_requests_lock);
 
     /* Clear beacon hints */
     spin_lock_bh(&reg_pending_beacons_lock);
     list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
         list_del(&reg_beacon->list);
         kfree(reg_beacon);
     }
     spin_unlock_bh(&reg_pending_beacons_lock);
 
     list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
         list_del(&reg_beacon->list);
         kfree(reg_beacon);
     }
 
     /* First restore to the basic regulatory settings */
     world_alpha2[0] = cfg80211_world_regdom->alpha2[0];
     world_alpha2[1] = cfg80211_world_regdom->alpha2[1];
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         if (rdev->wiphy.regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED)
             continue;
         if (rdev->wiphy.regulatory_flags & REGULATORY_CUSTOM_REG)
             restore_custom_reg_settings(&rdev->wiphy);
     }
 
     if (cached && (!is_an_alpha2(alpha2) ||
                !IS_ERR_OR_NULL(cfg80211_user_regdom))) {
         reset_regdomains(false, cfg80211_world_regdom);
         update_all_wiphy_regulatory(NL80211_REGDOM_SET_BY_CORE);
         print_regdomain(get_cfg80211_regdom());
         nl80211_send_reg_change_event(&core_request_world);
         reg_set_request_processed();
 
         if (is_an_alpha2(alpha2) &&
             !regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER)) {
             struct regulatory_request *ureq;
 
             spin_lock(&reg_requests_lock);
             ureq = list_last_entry(&reg_requests_list,
                            struct regulatory_request,
                            list);
             list_del(&ureq->list);
             spin_unlock(&reg_requests_lock);
 
             notify_self_managed_wiphys(ureq);
             reg_update_last_request(ureq);
             set_regdom(reg_copy_regd(cfg80211_user_regdom),
                    REGD_SOURCE_CACHED);
         }
     } else {
         regulatory_hint_core(world_alpha2);
 
         /*
          * This restores the ieee80211_regdom module parameter
          * preference or the last user requested regulatory
          * settings, user regulatory settings takes precedence.
          */
         if (is_an_alpha2(alpha2))
             regulatory_hint_user(alpha2, NL80211_USER_REG_HINT_USER);
     }
 
     spin_lock(&reg_requests_lock);
     list_splice_tail_init(&tmp_reg_req_list, &reg_requests_list);
     spin_unlock(&reg_requests_lock);
 
     pr_debug("Kicking the queue\n");
 
     schedule_work(&reg_work);
 }
 
 static bool is_wiphy_all_set_reg_flag(enum ieee80211_regulatory_flags flag)
 {
     struct cfg80211_registered_device *rdev;
     struct wireless_dev *wdev;
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
             wdev_lock(wdev);
             if (!(wdev->wiphy->regulatory_flags & flag)) {
                 wdev_unlock(wdev);
                 return false;
             }
             wdev_unlock(wdev);
         }
     }
 
     return true;
 }
 
 void regulatory_hint_disconnect(void)
 {
     /* Restore of regulatory settings is not required when wiphy(s)
      * ignore IE from connected access point but clearance of beacon hints
      * is required when wiphy(s) supports beacon hints.
      */
     if (is_wiphy_all_set_reg_flag(REGULATORY_COUNTRY_IE_IGNORE)) {
         struct reg_beacon *reg_beacon, *btmp;
 
         if (is_wiphy_all_set_reg_flag(REGULATORY_DISABLE_BEACON_HINTS))
             return;
 
         spin_lock_bh(&reg_pending_beacons_lock);
         list_for_each_entry_safe(reg_beacon, btmp,
                      &reg_pending_beacons, list) {
             list_del(&reg_beacon->list);
             kfree(reg_beacon);
         }
         spin_unlock_bh(&reg_pending_beacons_lock);
 
         list_for_each_entry_safe(reg_beacon, btmp,
                      &reg_beacon_list, list) {
             list_del(&reg_beacon->list);
             kfree(reg_beacon);
         }
 
         return;
     }
 
     pr_debug("All devices are disconnected, going to restore regulatory settings\n");
     restore_regulatory_settings(false, true);
 }
 
 static bool freq_is_chan_12_13_14(u32 freq)
 {
     if (freq == ieee80211_channel_to_frequency(12, NL80211_BAND_2GHZ) ||
         freq == ieee80211_channel_to_frequency(13, NL80211_BAND_2GHZ) ||
         freq == ieee80211_channel_to_frequency(14, NL80211_BAND_2GHZ))
         return true;
     return false;
 }
 
 static bool pending_reg_beacon(struct ieee80211_channel *beacon_chan)
 {
     struct reg_beacon *pending_beacon;
 
     list_for_each_entry(pending_beacon, &reg_pending_beacons, list)
         if (ieee80211_channel_equal(beacon_chan,
                         &pending_beacon->chan))
             return true;
     return false;
 }
 
 int regulatory_hint_found_beacon(struct wiphy *wiphy,
                  struct ieee80211_channel *beacon_chan,
                  gfp_t gfp)
 {
     struct reg_beacon *reg_beacon;
     bool processing;
 
     if (beacon_chan->beacon_found ||
         beacon_chan->flags & IEEE80211_CHAN_RADAR ||
         (beacon_chan->band == NL80211_BAND_2GHZ &&
          !freq_is_chan_12_13_14(beacon_chan->center_freq)))
         return 0;
 
     spin_lock_bh(&reg_pending_beacons_lock);
     processing = pending_reg_beacon(beacon_chan);
     spin_unlock_bh(&reg_pending_beacons_lock);
 
     if (processing)
         return 0;
 
     reg_beacon = kzalloc(sizeof(struct reg_beacon), gfp);
     if (!reg_beacon)
         return -ENOMEM;
 
     pr_debug("Found new beacon on frequency: %d.%03d MHz (Ch %d) on %s\n",
          beacon_chan->center_freq, beacon_chan->freq_offset,
          ieee80211_freq_khz_to_channel(
              ieee80211_channel_to_khz(beacon_chan)),
          wiphy_name(wiphy));
 
     memcpy(&reg_beacon->chan, beacon_chan,
            sizeof(struct ieee80211_channel));
 
     /*
      * Since we can be called from BH or and non-BH context
      * we must use spin_lock_bh()
      */
     spin_lock_bh(&reg_pending_beacons_lock);
     list_add_tail(&reg_beacon->list, &reg_pending_beacons);
     spin_unlock_bh(&reg_pending_beacons_lock);
 
     schedule_work(&reg_work);
 
     return 0;
 }
 
 static void print_rd_rules(const struct ieee80211_regdomain *rd)
 {
     unsigned int i;
     const struct ieee80211_reg_rule *reg_rule = NULL;
     const struct ieee80211_freq_range *freq_range = NULL;
     const struct ieee80211_power_rule *power_rule = NULL;
     char bw[32], cac_time[32];
 
     pr_debug("  (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
 
     for (i = 0; i < rd->n_reg_rules; i++) {
         reg_rule = &rd->reg_rules[i];
         freq_range = &reg_rule->freq_range;
         power_rule = &reg_rule->power_rule;
 
         if (reg_rule->flags & NL80211_RRF_AUTO_BW)
             snprintf(bw, sizeof(bw), "%d KHz, %u KHz AUTO",
                  freq_range->max_bandwidth_khz,
                  reg_get_max_bandwidth(rd, reg_rule));
         else
             snprintf(bw, sizeof(bw), "%d KHz",
                  freq_range->max_bandwidth_khz);
 
         if (reg_rule->flags & NL80211_RRF_DFS)
             scnprintf(cac_time, sizeof(cac_time), "%u s",
                   reg_rule->dfs_cac_ms/1000);
         else
             scnprintf(cac_time, sizeof(cac_time), "N/A");
 
 
         /*
          * There may not be documentation for max antenna gain
          * in certain regions
          */
         if (power_rule->max_antenna_gain)
             pr_debug("  (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
                 freq_range->start_freq_khz,
                 freq_range->end_freq_khz,
                 bw,
                 power_rule->max_antenna_gain,
                 power_rule->max_eirp,
                 cac_time);
         else
             pr_debug("  (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
                 freq_range->start_freq_khz,
                 freq_range->end_freq_khz,
                 bw,
                 power_rule->max_eirp,
                 cac_time);
     }
 }
 
 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region)
 {
     switch (dfs_region) {
     case NL80211_DFS_UNSET:
     case NL80211_DFS_FCC:
     case NL80211_DFS_ETSI:
     case NL80211_DFS_JP:
         return true;
     default:
         pr_debug("Ignoring unknown DFS master region: %d\n", dfs_region);
         return false;
     }
 }
 
 static void print_regdomain(const struct ieee80211_regdomain *rd)
 {
     struct regulatory_request *lr = get_last_request();
 
     if (is_intersected_alpha2(rd->alpha2)) {
         if (lr->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
             struct cfg80211_registered_device *rdev;
             rdev = cfg80211_rdev_by_wiphy_idx(lr->wiphy_idx);
             if (rdev) {
                 pr_debug("Current regulatory domain updated by AP to: %c%c\n",
                     rdev->country_ie_alpha2[0],
                     rdev->country_ie_alpha2[1]);
             } else
                 pr_debug("Current regulatory domain intersected:\n");
         } else
             pr_debug("Current regulatory domain intersected:\n");
     } else if (is_world_regdom(rd->alpha2)) {
         pr_debug("World regulatory domain updated:\n");
     } else {
         if (is_unknown_alpha2(rd->alpha2))
             pr_debug("Regulatory domain changed to driver built-in settings (unknown country)\n");
         else {
             if (reg_request_cell_base(lr))
                 pr_debug("Regulatory domain changed to country: %c%c by Cell Station\n",
                     rd->alpha2[0], rd->alpha2[1]);
             else
                 pr_debug("Regulatory domain changed to country: %c%c\n",
                     rd->alpha2[0], rd->alpha2[1]);
         }
     }
 
     pr_debug(" DFS Master region: %s", reg_dfs_region_str(rd->dfs_region));
     print_rd_rules(rd);
 }
 
 static void print_regdomain_info(const struct ieee80211_regdomain *rd)
 {
     pr_debug("Regulatory domain: %c%c\n", rd->alpha2[0], rd->alpha2[1]);
     print_rd_rules(rd);
 }
 
 static int reg_set_rd_core(const struct ieee80211_regdomain *rd)
 {
     if (!is_world_regdom(rd->alpha2))
         return -EINVAL;
     update_world_regdomain(rd);
     return 0;
 }
 
 static int reg_set_rd_user(const struct ieee80211_regdomain *rd,
                struct regulatory_request *user_request)
 {
     const struct ieee80211_regdomain *intersected_rd = NULL;
 
     if (!regdom_changes(rd->alpha2))
         return -EALREADY;
 
     if (!is_valid_rd(rd)) {
         pr_err("Invalid regulatory domain detected: %c%c\n",
                rd->alpha2[0], rd->alpha2[1]);
         print_regdomain_info(rd);
         return -EINVAL;
     }
 
     if (!user_request->intersect) {
         reset_regdomains(false, rd);
         return 0;
     }
 
     intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
     if (!intersected_rd)
         return -EINVAL;
 
     kfree(rd);
     rd = NULL;
     reset_regdomains(false, intersected_rd);
 
     return 0;
 }
 
 static int reg_set_rd_driver(const struct ieee80211_regdomain *rd,
                  struct regulatory_request *driver_request)
 {
     const struct ieee80211_regdomain *regd;
     const struct ieee80211_regdomain *intersected_rd = NULL;
     const struct ieee80211_regdomain *tmp;
     struct wiphy *request_wiphy;
 
     if (is_world_regdom(rd->alpha2))
         return -EINVAL;
 
     if (!regdom_changes(rd->alpha2))
         return -EALREADY;
 
     if (!is_valid_rd(rd)) {
         pr_err("Invalid regulatory domain detected: %c%c\n",
                rd->alpha2[0], rd->alpha2[1]);
         print_regdomain_info(rd);
         return -EINVAL;
     }
 
     request_wiphy = wiphy_idx_to_wiphy(driver_request->wiphy_idx);
     if (!request_wiphy)
         return -ENODEV;
 
     if (!driver_request->intersect) {
         ASSERT_RTNL();
         wiphy_lock(request_wiphy);
         if (request_wiphy->regd) {
             wiphy_unlock(request_wiphy);
             return -EALREADY;
         }
 
         regd = reg_copy_regd(rd);
         if (IS_ERR(regd)) {
             wiphy_unlock(request_wiphy);
             return PTR_ERR(regd);
         }
 
         rcu_assign_pointer(request_wiphy->regd, regd);
         wiphy_unlock(request_wiphy);
         reset_regdomains(false, rd);
         return 0;
     }
 
     intersected_rd = regdom_intersect(rd, get_cfg80211_regdom());
     if (!intersected_rd)
         return -EINVAL;
 
     /*
      * We can trash what CRDA provided now.
      * However if a driver requested this specific regulatory
      * domain we keep it for its private use
      */
     tmp = get_wiphy_regdom(request_wiphy);
     rcu_assign_pointer(request_wiphy->regd, rd);
     rcu_free_regdom(tmp);
 
     rd = NULL;
 
     reset_regdomains(false, intersected_rd);
 
     return 0;
 }
 
 static int reg_set_rd_country_ie(const struct ieee80211_regdomain *rd,
                  struct regulatory_request *country_ie_request)
 {
     struct wiphy *request_wiphy;
 
     if (!is_alpha2_set(rd->alpha2) && !is_an_alpha2(rd->alpha2) &&
         !is_unknown_alpha2(rd->alpha2))
         return -EINVAL;
 
     /*
      * Lets only bother proceeding on the same alpha2 if the current
      * rd is non static (it means CRDA was present and was used last)
      * and the pending request came in from a country IE
      */
 
     if (!is_valid_rd(rd)) {
         pr_err("Invalid regulatory domain detected: %c%c\n",
                rd->alpha2[0], rd->alpha2[1]);
         print_regdomain_info(rd);
         return -EINVAL;
     }
 
     request_wiphy = wiphy_idx_to_wiphy(country_ie_request->wiphy_idx);
     if (!request_wiphy)
         return -ENODEV;
 
     if (country_ie_request->intersect)
         return -EINVAL;
 
     reset_regdomains(false, rd);
     return 0;
 }
 
 /*
  * Use this call to set the current regulatory domain. Conflicts with
  * multiple drivers can be ironed out later. Caller must've already
  * kmalloc'd the rd structure.
  */
 int set_regdom(const struct ieee80211_regdomain *rd,
            enum ieee80211_regd_source regd_src)
 {
     struct regulatory_request *lr;
     bool user_reset = false;
     int r;
 
     if (IS_ERR_OR_NULL(rd))
         return -ENODATA;
 
     if (!reg_is_valid_request(rd->alpha2)) {
         kfree(rd);
         return -EINVAL;
     }
 
     if (regd_src == REGD_SOURCE_CRDA)
         reset_crda_timeouts();
 
     lr = get_last_request();
 
     /* Note that this doesn't update the wiphys, this is done below */
     switch (lr->initiator) {
     case NL80211_REGDOM_SET_BY_CORE:
         r = reg_set_rd_core(rd);
         break;
     case NL80211_REGDOM_SET_BY_USER:
         cfg80211_save_user_regdom(rd);
         r = reg_set_rd_user(rd, lr);
         user_reset = true;
         break;
     case NL80211_REGDOM_SET_BY_DRIVER:
         r = reg_set_rd_driver(rd, lr);
         break;
     case NL80211_REGDOM_SET_BY_COUNTRY_IE:
         r = reg_set_rd_country_ie(rd, lr);
         break;
     default:
         WARN(1, "invalid initiator %d\n", lr->initiator);
         kfree(rd);
         return -EINVAL;
     }
 
     if (r) {
         switch (r) {
         case -EALREADY:
             reg_set_request_processed();
             break;
         default:
             /* Back to world regulatory in case of errors */
             restore_regulatory_settings(user_reset, false);
         }
 
         kfree(rd);
         return r;
     }
 
     /* This would make this whole thing pointless */
     if (WARN_ON(!lr->intersect && rd != get_cfg80211_regdom()))
         return -EINVAL;
 
     /* update all wiphys now with the new established regulatory domain */
     update_all_wiphy_regulatory(lr->initiator);
 
     print_regdomain(get_cfg80211_regdom());
 
     nl80211_send_reg_change_event(lr);
 
     reg_set_request_processed();
 
     return 0;
 }
 
 static int __regulatory_set_wiphy_regd(struct wiphy *wiphy,
                        struct ieee80211_regdomain *rd)
 {
     const struct ieee80211_regdomain *regd;
     const struct ieee80211_regdomain *prev_regd;
     struct cfg80211_registered_device *rdev;
 
     if (WARN_ON(!wiphy || !rd))
         return -EINVAL;
 
     if (WARN(!(wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED),
          "wiphy should have REGULATORY_WIPHY_SELF_MANAGED\n"))
         return -EPERM;
 
     if (WARN(!is_valid_rd(rd),
          "Invalid regulatory domain detected: %c%c\n",
          rd->alpha2[0], rd->alpha2[1])) {
         print_regdomain_info(rd);
         return -EINVAL;
     }
 
     regd = reg_copy_regd(rd);
     if (IS_ERR(regd))
         return PTR_ERR(regd);
 
     rdev = wiphy_to_rdev(wiphy);
 
     spin_lock(&reg_requests_lock);
     prev_regd = rdev->requested_regd;
     rdev->requested_regd = regd;
     spin_unlock(&reg_requests_lock);
 
     kfree(prev_regd);
     return 0;
 }
 
 int regulatory_set_wiphy_regd(struct wiphy *wiphy,
                   struct ieee80211_regdomain *rd)
 {
     int ret = __regulatory_set_wiphy_regd(wiphy, rd);
 
     if (ret)
         return ret;
 
     schedule_work(&reg_work);
     return 0;
 }
 EXPORT_SYMBOL(regulatory_set_wiphy_regd);
 
 int regulatory_set_wiphy_regd_sync(struct wiphy *wiphy,
                    struct ieee80211_regdomain *rd)
 {
     int ret;
 
     ASSERT_RTNL();
 
     ret = __regulatory_set_wiphy_regd(wiphy, rd);
     if (ret)
         return ret;
 
     /* process the request immediately */
     reg_process_self_managed_hint(wiphy);
     reg_check_channels();
     return 0;
 }
 EXPORT_SYMBOL(regulatory_set_wiphy_regd_sync);
 
 void wiphy_regulatory_register(struct wiphy *wiphy)
 {
     struct regulatory_request *lr = get_last_request();
 
     /* self-managed devices ignore beacon hints and country IE */
     if (wiphy->regulatory_flags & REGULATORY_WIPHY_SELF_MANAGED) {
         wiphy->regulatory_flags |= REGULATORY_DISABLE_BEACON_HINTS |
                        REGULATORY_COUNTRY_IE_IGNORE;
 
         /*
          * The last request may have been received before this
          * registration call. Call the driver notifier if
          * initiator is USER.
          */
         if (lr->initiator == NL80211_REGDOM_SET_BY_USER)
             reg_call_notifier(wiphy, lr);
     }
 
     if (!reg_dev_ignore_cell_hint(wiphy))
         reg_num_devs_support_basehint++;
 
     wiphy_update_regulatory(wiphy, lr->initiator);
     wiphy_all_share_dfs_chan_state(wiphy);
     reg_process_self_managed_hints();
 }
 
 void wiphy_regulatory_deregister(struct wiphy *wiphy)
 {
     struct wiphy *request_wiphy = NULL;
     struct regulatory_request *lr;
 
     lr = get_last_request();
 
     if (!reg_dev_ignore_cell_hint(wiphy))
         reg_num_devs_support_basehint--;
 
     rcu_free_regdom(get_wiphy_regdom(wiphy));
     RCU_INIT_POINTER(wiphy->regd, NULL);
 
     if (lr)
         request_wiphy = wiphy_idx_to_wiphy(lr->wiphy_idx);
 
     if (!request_wiphy || request_wiphy != wiphy)
         return;
 
     lr->wiphy_idx = WIPHY_IDX_INVALID;
     lr->country_ie_env = ENVIRON_ANY;
 }
 
 /*
  * See FCC notices for UNII band definitions
  *  5GHz: https://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii
  *  6GHz: https://www.fcc.gov/document/fcc-proposes-more-spectrum-unlicensed-use-0
  */
 int cfg80211_get_unii(int freq)
 {
     /* UNII-1 */
     if (freq >= 5150 && freq <= 5250)
         return 0;
 
     /* UNII-2A */
     if (freq > 5250 && freq <= 5350)
         return 1;
 
     /* UNII-2B */
     if (freq > 5350 && freq <= 5470)
         return 2;
 
     /* UNII-2C */
     if (freq > 5470 && freq <= 5725)
         return 3;
 
     /* UNII-3 */
     if (freq > 5725 && freq <= 5825)
         return 4;
 
     /* UNII-5 */
     if (freq > 5925 && freq <= 6425)
         return 5;
 
     /* UNII-6 */
     if (freq > 6425 && freq <= 6525)
         return 6;
 
     /* UNII-7 */
     if (freq > 6525 && freq <= 6875)
         return 7;
 
     /* UNII-8 */
     if (freq > 6875 && freq <= 7125)
         return 8;
 
     return -EINVAL;
 }
 
 bool regulatory_indoor_allowed(void)
 {
     return reg_is_indoor;
 }
 
 bool regulatory_pre_cac_allowed(struct wiphy *wiphy)
 {
     const struct ieee80211_regdomain *regd = NULL;
     const struct ieee80211_regdomain *wiphy_regd = NULL;
     bool pre_cac_allowed = false;
 
     rcu_read_lock();
 
     regd = rcu_dereference(cfg80211_regdomain);
     wiphy_regd = rcu_dereference(wiphy->regd);
     if (!wiphy_regd) {
         if (regd->dfs_region == NL80211_DFS_ETSI)
             pre_cac_allowed = true;
 
         rcu_read_unlock();
 
         return pre_cac_allowed;
     }
 
     if (regd->dfs_region == wiphy_regd->dfs_region &&
         wiphy_regd->dfs_region == NL80211_DFS_ETSI)
         pre_cac_allowed = true;
 
     rcu_read_unlock();
 
     return pre_cac_allowed;
 }
 EXPORT_SYMBOL(regulatory_pre_cac_allowed);
 
 static void cfg80211_check_and_end_cac(struct cfg80211_registered_device *rdev)
 {
     struct wireless_dev *wdev;
     /* If we finished CAC or received radar, we should end any
      * CAC running on the same channels.
      * the check !cfg80211_chandef_dfs_usable contain 2 options:
      * either all channels are available - those the CAC_FINISHED
      * event has effected another wdev state, or there is a channel
      * in unavailable state in wdev chandef - those the RADAR_DETECTED
      * event has effected another wdev state.
      * In both cases we should end the CAC on the wdev.
      */
     list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
         struct cfg80211_chan_def *chandef;
 
         if (!wdev->cac_started)
             continue;
 
         /* FIXME: radar detection is tied to link 0 for now */
         chandef = wdev_chandef(wdev, 0);
         if (!chandef)
             continue;
 
         if (!cfg80211_chandef_dfs_usable(&rdev->wiphy, chandef))
             rdev_end_cac(rdev, wdev->netdev);
     }
 }
 
 void regulatory_propagate_dfs_state(struct wiphy *wiphy,
                     struct cfg80211_chan_def *chandef,
                     enum nl80211_dfs_state dfs_state,
                     enum nl80211_radar_event event)
 {
     struct cfg80211_registered_device *rdev;
 
     ASSERT_RTNL();
 
     if (WARN_ON(!cfg80211_chandef_valid(chandef)))
         return;
 
     list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
         if (wiphy == &rdev->wiphy)
             continue;
 
         if (!reg_dfs_domain_same(wiphy, &rdev->wiphy))
             continue;
 
         if (!ieee80211_get_channel(&rdev->wiphy,
                        chandef->chan->center_freq))
             continue;
 
         cfg80211_set_dfs_state(&rdev->wiphy, chandef, dfs_state);
 
         if (event == NL80211_RADAR_DETECTED ||
             event == NL80211_RADAR_CAC_FINISHED) {
             cfg80211_sched_dfs_chan_update(rdev);
             cfg80211_check_and_end_cac(rdev);
         }
 
         nl80211_radar_notify(rdev, chandef, event, NULL, GFP_KERNEL);
     }
 }
 
 static int __init regulatory_init_db(void)
 {
     int err;
 
     /*
      * It's possible that - due to other bugs/issues - cfg80211
      * never called regulatory_init() below, or that it failed;
      * in that case, don't try to do any further work here as
      * it's doomed to lead to crashes.
      */
     if (IS_ERR_OR_NULL(reg_pdev))
         return -EINVAL;
 
     err = load_builtin_regdb_keys();
     if (err)
         return err;
 
     /* We always try to get an update for the static regdomain */
     err = regulatory_hint_core(cfg80211_world_regdom->alpha2);
     if (err) {
         if (err == -ENOMEM) {
             platform_device_unregister(reg_pdev);
             return err;
         }
         /*
          * N.B. kobject_uevent_env() can fail mainly for when we're out
          * memory which is handled and propagated appropriately above
          * but it can also fail during a netlink_broadcast() or during
          * early boot for call_usermodehelper(). For now treat these
          * errors as non-fatal.
          */
         pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
     }
 
     /*
      * Finally, if the user set the module parameter treat it
      * as a user hint.
      */
     if (!is_world_regdom(ieee80211_regdom))
         regulatory_hint_user(ieee80211_regdom,
                      NL80211_USER_REG_HINT_USER);
 
     return 0;
 }
 #ifndef MODULE
 late_initcall(regulatory_init_db);
 #endif
 
 int __init regulatory_init(void)
 {
     reg_pdev = platform_device_register_simple("regulatory", 0, NULL, 0);
     if (IS_ERR(reg_pdev))
         return PTR_ERR(reg_pdev);
 
     rcu_assign_pointer(cfg80211_regdomain, cfg80211_world_regdom);
 
     user_alpha2[0] = '9';
     user_alpha2[1] = '7';
 
 #ifdef MODULE
     return regulatory_init_db();
 #else
     return 0;
 #endif
 }
 
 void regulatory_exit(void)
 {
     struct regulatory_request *reg_request, *tmp;
     struct reg_beacon *reg_beacon, *btmp;
 
     cancel_work_sync(&reg_work);
     cancel_crda_timeout_sync();
     cancel_delayed_work_sync(&reg_check_chans);
 
     /* Lock to suppress warnings */
     rtnl_lock();
     reset_regdomains(true, NULL);
     rtnl_unlock();
 
     dev_set_uevent_suppress(&reg_pdev->dev, true);
 
     platform_device_unregister(reg_pdev);
 
     list_for_each_entry_safe(reg_beacon, btmp, &reg_pending_beacons, list) {
         list_del(&reg_beacon->list);
         kfree(reg_beacon);
     }
 
     list_for_each_entry_safe(reg_beacon, btmp, &reg_beacon_list, list) {
         list_del(&reg_beacon->list);
         kfree(reg_beacon);
     }
 
     list_for_each_entry_safe(reg_request, tmp, &reg_requests_list, list) {
         list_del(&reg_request->list);
         kfree(reg_request);
     }
 
     if (!IS_ERR_OR_NULL(regdb))
         kfree(regdb);
     if (!IS_ERR_OR_NULL(cfg80211_user_regdom))
         kfree(cfg80211_user_regdom);
 
     free_regdb_keyring();
 }