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

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * SBP2 driver (SCSI over IEEE1394)
  *
  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
  */
 
 /*
  * The basic structure of this driver is based on the old storage driver,
  * drivers/ieee1394/sbp2.c, originally written by
  *     James Goodwin <jamesg@filanet.com>
  * with later contributions and ongoing maintenance from
  *     Ben Collins <bcollins@debian.org>,
  *     Stefan Richter <stefanr@s5r6.in-berlin.de>
  * and many others.
  */
 
 #include <linux/blkdev.h>
 #include <linux/bug.h>
 #include <linux/completion.h>
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/dma-mapping.h>
 #include <linux/firewire.h>
 #include <linux/firewire-constants.h>
 #include <linux/init.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
 #include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/scatterlist.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/string.h>
 #include <linux/stringify.h>
 #include <linux/workqueue.h>
 
 #include <asm/byteorder.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 
 /*
  * So far only bridges from Oxford Semiconductor are known to support
  * concurrent logins. Depending on firmware, four or two concurrent logins
  * are possible on OXFW911 and newer Oxsemi bridges.
  *
  * Concurrent logins are useful together with cluster filesystems.
  */
 static bool sbp2_param_exclusive_login = 1;
 module_param_named(exclusive_login, sbp2_param_exclusive_login, bool, 0644);
 MODULE_PARM_DESC(exclusive_login, "Exclusive login to sbp2 device "
          "(default = Y, use N for concurrent initiators)");
 
 /*
  * Flags for firmware oddities
  *
  * - 128kB max transfer
  *   Limit transfer size. Necessary for some old bridges.
  *
  * - 36 byte inquiry
  *   When scsi_mod probes the device, let the inquiry command look like that
  *   from MS Windows.
  *
  * - skip mode page 8
  *   Suppress sending of mode_sense for mode page 8 if the device pretends to
  *   support the SCSI Primary Block commands instead of Reduced Block Commands.
  *
  * - fix capacity
  *   Tell sd_mod to correct the last sector number reported by read_capacity.
  *   Avoids access beyond actual disk limits on devices with an off-by-one bug.
  *   Don't use this with devices which don't have this bug.
  *
  * - delay inquiry
  *   Wait extra SBP2_INQUIRY_DELAY seconds after login before SCSI inquiry.
  *
  * - power condition
  *   Set the power condition field in the START STOP UNIT commands sent by
  *   sd_mod on suspend, resume, and shutdown (if manage_start_stop is on).
  *   Some disks need this to spin down or to resume properly.
  *
  * - override internal blacklist
  *   Instead of adding to the built-in blacklist, use only the workarounds
  *   specified in the module load parameter.
  *   Useful if a blacklist entry interfered with a non-broken device.
  */
 #define SBP2_WORKAROUND_128K_MAX_TRANS  0x1
 #define SBP2_WORKAROUND_INQUIRY_36  0x2
 #define SBP2_WORKAROUND_MODE_SENSE_8    0x4
 #define SBP2_WORKAROUND_FIX_CAPACITY    0x8
 #define SBP2_WORKAROUND_DELAY_INQUIRY   0x10
 #define SBP2_INQUIRY_DELAY      12
 #define SBP2_WORKAROUND_POWER_CONDITION 0x20
 #define SBP2_WORKAROUND_OVERRIDE    0x100
 
 static int sbp2_param_workarounds;
 module_param_named(workarounds, sbp2_param_workarounds, int, 0644);
 MODULE_PARM_DESC(workarounds, "Work around device bugs (default = 0"
     ", 128kB max transfer = " __stringify(SBP2_WORKAROUND_128K_MAX_TRANS)
     ", 36 byte inquiry = "    __stringify(SBP2_WORKAROUND_INQUIRY_36)
     ", skip mode page 8 = "   __stringify(SBP2_WORKAROUND_MODE_SENSE_8)
     ", fix capacity = "       __stringify(SBP2_WORKAROUND_FIX_CAPACITY)
     ", delay inquiry = "      __stringify(SBP2_WORKAROUND_DELAY_INQUIRY)
     ", set power condition in start stop unit = "
                   __stringify(SBP2_WORKAROUND_POWER_CONDITION)
     ", override internal blacklist = " __stringify(SBP2_WORKAROUND_OVERRIDE)
     ", or a combination)");
 
 /*
  * We create one struct sbp2_logical_unit per SBP-2 Logical Unit Number Entry
  * and one struct scsi_device per sbp2_logical_unit.
  */
 struct sbp2_logical_unit {
     struct sbp2_target *tgt;
     struct list_head link;
     struct fw_address_handler address_handler;
     struct list_head orb_list;
 
     u64 command_block_agent_address;
     u16 lun;
     int login_id;
 
     /*
      * The generation is updated once we've logged in or reconnected
      * to the logical unit.  Thus, I/O to the device will automatically
      * fail and get retried if it happens in a window where the device
      * is not ready, e.g. after a bus reset but before we reconnect.
      */
     int generation;
     int retries;
     work_func_t workfn;
     struct delayed_work work;
     bool has_sdev;
     bool blocked;
 };
 
 static void sbp2_queue_work(struct sbp2_logical_unit *lu, unsigned long delay)
 {
     queue_delayed_work(fw_workqueue, &lu->work, delay);
 }
 
 /*
  * We create one struct sbp2_target per IEEE 1212 Unit Directory
  * and one struct Scsi_Host per sbp2_target.
  */
 struct sbp2_target {
     struct fw_unit *unit;
     struct list_head lu_list;
 
     u64 management_agent_address;
     u64 guid;
     int directory_id;
     int node_id;
     int address_high;
     unsigned int workarounds;
     unsigned int mgt_orb_timeout;
     unsigned int max_payload;
 
     spinlock_t lock;
     int dont_block; /* counter for each logical unit */
     int blocked;    /* ditto */
 };
 
 static struct fw_device *target_parent_device(struct sbp2_target *tgt)
 {
     return fw_parent_device(tgt->unit);
 }
 
 static const struct device *tgt_dev(const struct sbp2_target *tgt)
 {
     return &tgt->unit->device;
 }
 
 static const struct device *lu_dev(const struct sbp2_logical_unit *lu)
 {
     return &lu->tgt->unit->device;
 }
 
 /* Impossible login_id, to detect logout attempt before successful login */
 #define INVALID_LOGIN_ID 0x10000
 
 #define SBP2_ORB_TIMEOUT        2000U       /* Timeout in ms */
 #define SBP2_ORB_NULL           0x80000000
 #define SBP2_RETRY_LIMIT        0xf     /* 15 retries */
 #define SBP2_CYCLE_LIMIT        (0xc8 << 12)    /* 200 125us cycles */
 
 /*
  * There is no transport protocol limit to the CDB length,  but we implement
  * a fixed length only.  16 bytes is enough for disks larger than 2 TB.
  */
 #define SBP2_MAX_CDB_SIZE       16
 
 /*
  * The maximum SBP-2 data buffer size is 0xffff.  We quadlet-align this
  * for compatibility with earlier versions of this driver.
  */
 #define SBP2_MAX_SEG_SIZE       0xfffc
 
 /* Unit directory keys */
 #define SBP2_CSR_UNIT_CHARACTERISTICS   0x3a
 #define SBP2_CSR_FIRMWARE_REVISION  0x3c
 #define SBP2_CSR_LOGICAL_UNIT_NUMBER    0x14
 #define SBP2_CSR_UNIT_UNIQUE_ID     0x8d
 #define SBP2_CSR_LOGICAL_UNIT_DIRECTORY 0xd4
 
 /* Management orb opcodes */
 #define SBP2_LOGIN_REQUEST      0x0
 #define SBP2_QUERY_LOGINS_REQUEST   0x1
 #define SBP2_RECONNECT_REQUEST      0x3
 #define SBP2_SET_PASSWORD_REQUEST   0x4
 #define SBP2_LOGOUT_REQUEST     0x7
 #define SBP2_ABORT_TASK_REQUEST     0xb
 #define SBP2_ABORT_TASK_SET     0xc
 #define SBP2_LOGICAL_UNIT_RESET     0xe
 #define SBP2_TARGET_RESET_REQUEST   0xf
 
 /* Offsets for command block agent registers */
 #define SBP2_AGENT_STATE        0x00
 #define SBP2_AGENT_RESET        0x04
 #define SBP2_ORB_POINTER        0x08
 #define SBP2_DOORBELL           0x10
 #define SBP2_UNSOLICITED_STATUS_ENABLE  0x14
 
 /* Status write response codes */
 #define SBP2_STATUS_REQUEST_COMPLETE    0x0
 #define SBP2_STATUS_TRANSPORT_FAILURE   0x1
 #define SBP2_STATUS_ILLEGAL_REQUEST 0x2
 #define SBP2_STATUS_VENDOR_DEPENDENT    0x3
 
 #define STATUS_GET_ORB_HIGH(v)      ((v).status & 0xffff)
 #define STATUS_GET_SBP_STATUS(v)    (((v).status >> 16) & 0xff)
 #define STATUS_GET_LEN(v)       (((v).status >> 24) & 0x07)
 #define STATUS_GET_DEAD(v)      (((v).status >> 27) & 0x01)
 #define STATUS_GET_RESPONSE(v)      (((v).status >> 28) & 0x03)
 #define STATUS_GET_SOURCE(v)        (((v).status >> 30) & 0x03)
 #define STATUS_GET_ORB_LOW(v)       ((v).orb_low)
 #define STATUS_GET_DATA(v)      ((v).data)
 
 struct sbp2_status {
     u32 status;
     u32 orb_low;
     u8 data[24];
 };
 
 struct sbp2_pointer {
     __be32 high;
     __be32 low;
 };
 
 struct sbp2_orb {
     struct fw_transaction t;
     struct kref kref;
     dma_addr_t request_bus;
     int rcode;
     void (*callback)(struct sbp2_orb * orb, struct sbp2_status * status);
     struct sbp2_logical_unit *lu;
     struct list_head link;
 };
 
 #define MANAGEMENT_ORB_LUN(v)           ((v))
 #define MANAGEMENT_ORB_FUNCTION(v)      ((v) << 16)
 #define MANAGEMENT_ORB_RECONNECT(v)     ((v) << 20)
 #define MANAGEMENT_ORB_EXCLUSIVE(v)     ((v) ? 1 << 28 : 0)
 #define MANAGEMENT_ORB_REQUEST_FORMAT(v)    ((v) << 29)
 #define MANAGEMENT_ORB_NOTIFY           ((1) << 31)
 
 #define MANAGEMENT_ORB_RESPONSE_LENGTH(v)   ((v))
 #define MANAGEMENT_ORB_PASSWORD_LENGTH(v)   ((v) << 16)
 
 struct sbp2_management_orb {
     struct sbp2_orb base;
     struct {
         struct sbp2_pointer password;
         struct sbp2_pointer response;
         __be32 misc;
         __be32 length;
         struct sbp2_pointer status_fifo;
     } request;
     __be32 response[4];
     dma_addr_t response_bus;
     struct completion done;
     struct sbp2_status status;
 };
 
 struct sbp2_login_response {
     __be32 misc;
     struct sbp2_pointer command_block_agent;
     __be32 reconnect_hold;
 };
 #define COMMAND_ORB_DATA_SIZE(v)    ((v))
 #define COMMAND_ORB_PAGE_SIZE(v)    ((v) << 16)
 #define COMMAND_ORB_PAGE_TABLE_PRESENT  ((1) << 19)
 #define COMMAND_ORB_MAX_PAYLOAD(v)  ((v) << 20)
 #define COMMAND_ORB_SPEED(v)        ((v) << 24)
 #define COMMAND_ORB_DIRECTION       ((1) << 27)
 #define COMMAND_ORB_REQUEST_FORMAT(v)   ((v) << 29)
 #define COMMAND_ORB_NOTIFY      ((1) << 31)
 
 struct sbp2_command_orb {
     struct sbp2_orb base;
     struct {
         struct sbp2_pointer next;
         struct sbp2_pointer data_descriptor;
         __be32 misc;
         u8 command_block[SBP2_MAX_CDB_SIZE];
     } request;
     struct scsi_cmnd *cmd;
 
     struct sbp2_pointer page_table[SG_ALL] __attribute__((aligned(8)));
     dma_addr_t page_table_bus;
 };
 
 #define SBP2_ROM_VALUE_WILDCARD ~0         /* match all */
 #define SBP2_ROM_VALUE_MISSING  0xff000000 /* not present in the unit dir. */
 
 /*
  * List of devices with known bugs.
  *
  * The firmware_revision field, masked with 0xffff00, is the best
  * indicator for the type of bridge chip of a device.  It yields a few
  * false positives but this did not break correctly behaving devices
  * so far.
  */
 static const struct {
     u32 firmware_revision;
     u32 model;
     unsigned int workarounds;
 } sbp2_workarounds_table[] = {
     /* DViCO Momobay CX-1 with TSB42AA9 bridge */ {
         .firmware_revision  = 0x002800,
         .model          = 0x001010,
         .workarounds        = SBP2_WORKAROUND_INQUIRY_36 |
                       SBP2_WORKAROUND_MODE_SENSE_8 |
                       SBP2_WORKAROUND_POWER_CONDITION,
     },
     /* DViCO Momobay FX-3A with TSB42AA9A bridge */ {
         .firmware_revision  = 0x002800,
         .model          = 0x000000,
         .workarounds        = SBP2_WORKAROUND_POWER_CONDITION,
     },
     /* Initio bridges, actually only needed for some older ones */ {
         .firmware_revision  = 0x000200,
         .model          = SBP2_ROM_VALUE_WILDCARD,
         .workarounds        = SBP2_WORKAROUND_INQUIRY_36,
     },
     /* PL-3507 bridge with Prolific firmware */ {
         .firmware_revision  = 0x012800,
         .model          = SBP2_ROM_VALUE_WILDCARD,
         .workarounds        = SBP2_WORKAROUND_POWER_CONDITION,
     },
     /* Symbios bridge */ {
         .firmware_revision  = 0xa0b800,
         .model          = SBP2_ROM_VALUE_WILDCARD,
         .workarounds        = SBP2_WORKAROUND_128K_MAX_TRANS,
     },
     /* Datafab MD2-FW2 with Symbios/LSILogic SYM13FW500 bridge */ {
         .firmware_revision  = 0x002600,
         .model          = SBP2_ROM_VALUE_WILDCARD,
         .workarounds        = SBP2_WORKAROUND_128K_MAX_TRANS,
     },
     /*
      * iPod 2nd generation: needs 128k max transfer size workaround
      * iPod 3rd generation: needs fix capacity workaround
      */
     {
         .firmware_revision  = 0x0a2700,
         .model          = 0x000000,
         .workarounds        = SBP2_WORKAROUND_128K_MAX_TRANS |
                       SBP2_WORKAROUND_FIX_CAPACITY,
     },
     /* iPod 4th generation */ {
         .firmware_revision  = 0x0a2700,
         .model          = 0x000021,
         .workarounds        = SBP2_WORKAROUND_FIX_CAPACITY,
     },
     /* iPod mini */ {
         .firmware_revision  = 0x0a2700,
         .model          = 0x000022,
         .workarounds        = SBP2_WORKAROUND_FIX_CAPACITY,
     },
     /* iPod mini */ {
         .firmware_revision  = 0x0a2700,
         .model          = 0x000023,
         .workarounds        = SBP2_WORKAROUND_FIX_CAPACITY,
     },
     /* iPod Photo */ {
         .firmware_revision  = 0x0a2700,
         .model          = 0x00007e,
         .workarounds        = SBP2_WORKAROUND_FIX_CAPACITY,
     }
 };
 
 static void free_orb(struct kref *kref)
 {
     struct sbp2_orb *orb = container_of(kref, struct sbp2_orb, kref);
 
     kfree(orb);
 }
 
 static void sbp2_status_write(struct fw_card *card, struct fw_request *request,
                   int tcode, int destination, int source,
                   int generation, unsigned long long offset,
                   void *payload, size_t length, void *callback_data)
 {
     struct sbp2_logical_unit *lu = callback_data;
     struct sbp2_orb *orb = NULL, *iter;
     struct sbp2_status status;
     unsigned long flags;
 
     if (tcode != TCODE_WRITE_BLOCK_REQUEST ||
         length < 8 || length > sizeof(status)) {
         fw_send_response(card, request, RCODE_TYPE_ERROR);
         return;
     }
 
     status.status  = be32_to_cpup(payload);
     status.orb_low = be32_to_cpup(payload + 4);
     memset(status.data, 0, sizeof(status.data));
     if (length > 8)
         memcpy(status.data, payload + 8, length - 8);
 
     if (STATUS_GET_SOURCE(status) == 2 || STATUS_GET_SOURCE(status) == 3) {
         dev_notice(lu_dev(lu),
                "non-ORB related status write, not handled\n");
         fw_send_response(card, request, RCODE_COMPLETE);
         return;
     }
 
     /* Lookup the orb corresponding to this status write. */
     spin_lock_irqsave(&lu->tgt->lock, flags);
     list_for_each_entry(iter, &lu->orb_list, link) {
         if (STATUS_GET_ORB_HIGH(status) == 0 &&
             STATUS_GET_ORB_LOW(status) == iter->request_bus) {
             iter->rcode = RCODE_COMPLETE;
             list_del(&iter->link);
             orb = iter;
             break;
         }
     }
     spin_unlock_irqrestore(&lu->tgt->lock, flags);
 
     if (orb) {
         orb->callback(orb, &status);
         kref_put(&orb->kref, free_orb); /* orb callback reference */
     } else {
         dev_err(lu_dev(lu), "status write for unknown ORB\n");
     }
 
     fw_send_response(card, request, RCODE_COMPLETE);
 }
 
 static void complete_transaction(struct fw_card *card, int rcode,
                  void *payload, size_t length, void *data)
 {
     struct sbp2_orb *orb = data;
     unsigned long flags;
 
     /*
      * This is a little tricky.  We can get the status write for
      * the orb before we get this callback.  The status write
      * handler above will assume the orb pointer transaction was
      * successful and set the rcode to RCODE_COMPLETE for the orb.
      * So this callback only sets the rcode if it hasn't already
      * been set and only does the cleanup if the transaction
      * failed and we didn't already get a status write.
      */
     spin_lock_irqsave(&orb->lu->tgt->lock, flags);
 
     if (orb->rcode == -1)
         orb->rcode = rcode;
     if (orb->rcode != RCODE_COMPLETE) {
         list_del(&orb->link);
         spin_unlock_irqrestore(&orb->lu->tgt->lock, flags);
 
         orb->callback(orb, NULL);
         kref_put(&orb->kref, free_orb); /* orb callback reference */
     } else {
         spin_unlock_irqrestore(&orb->lu->tgt->lock, flags);
     }
 
     kref_put(&orb->kref, free_orb); /* transaction callback reference */
 }
 
 static void sbp2_send_orb(struct sbp2_orb *orb, struct sbp2_logical_unit *lu,
               int node_id, int generation, u64 offset)
 {
     struct fw_device *device = target_parent_device(lu->tgt);
     struct sbp2_pointer orb_pointer;
     unsigned long flags;
 
     orb_pointer.high = 0;
     orb_pointer.low = cpu_to_be32(orb->request_bus);
 
     orb->lu = lu;
     spin_lock_irqsave(&lu->tgt->lock, flags);
     list_add_tail(&orb->link, &lu->orb_list);
     spin_unlock_irqrestore(&lu->tgt->lock, flags);
 
     kref_get(&orb->kref); /* transaction callback reference */
     kref_get(&orb->kref); /* orb callback reference */
 
     fw_send_request(device->card, &orb->t, TCODE_WRITE_BLOCK_REQUEST,
             node_id, generation, device->max_speed, offset,
             &orb_pointer, 8, complete_transaction, orb);
 }
 
 static int sbp2_cancel_orbs(struct sbp2_logical_unit *lu)
 {
     struct fw_device *device = target_parent_device(lu->tgt);
     struct sbp2_orb *orb, *next;
     struct list_head list;
     int retval = -ENOENT;
 
     INIT_LIST_HEAD(&list);
     spin_lock_irq(&lu->tgt->lock);
     list_splice_init(&lu->orb_list, &list);
     spin_unlock_irq(&lu->tgt->lock);
 
     list_for_each_entry_safe(orb, next, &list, link) {
         retval = 0;
         if (fw_cancel_transaction(device->card, &orb->t) == 0)
             continue;
 
         orb->rcode = RCODE_CANCELLED;
         orb->callback(orb, NULL);
         kref_put(&orb->kref, free_orb); /* orb callback reference */
     }
 
     return retval;
 }
 
 static void complete_management_orb(struct sbp2_orb *base_orb,
                     struct sbp2_status *status)
 {
     struct sbp2_management_orb *orb =
         container_of(base_orb, struct sbp2_management_orb, base);
 
     if (status)
         memcpy(&orb->status, status, sizeof(*status));
     complete(&orb->done);
 }
 
 static int sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id,
                     int generation, int function,
                     int lun_or_login_id, void *response)
 {
     struct fw_device *device = target_parent_device(lu->tgt);
     struct sbp2_management_orb *orb;
     unsigned int timeout;
     int retval = -ENOMEM;
 
     if (function == SBP2_LOGOUT_REQUEST && fw_device_is_shutdown(device))
         return 0;
 
     orb = kzalloc(sizeof(*orb), GFP_NOIO);
     if (orb == NULL)
         return -ENOMEM;
 
     kref_init(&orb->base.kref);
     orb->response_bus =
         dma_map_single(device->card->device, &orb->response,
                    sizeof(orb->response), DMA_FROM_DEVICE);
     if (dma_mapping_error(device->card->device, orb->response_bus))
         goto fail_mapping_response;
 
     orb->request.response.high = 0;
     orb->request.response.low  = cpu_to_be32(orb->response_bus);
 
     orb->request.misc = cpu_to_be32(
         MANAGEMENT_ORB_NOTIFY |
         MANAGEMENT_ORB_FUNCTION(function) |
         MANAGEMENT_ORB_LUN(lun_or_login_id));
     orb->request.length = cpu_to_be32(
         MANAGEMENT_ORB_RESPONSE_LENGTH(sizeof(orb->response)));
 
     orb->request.status_fifo.high =
         cpu_to_be32(lu->address_handler.offset >> 32);
     orb->request.status_fifo.low  =
         cpu_to_be32(lu->address_handler.offset);
 
     if (function == SBP2_LOGIN_REQUEST) {
         /* Ask for 2^2 == 4 seconds reconnect grace period */
         orb->request.misc |= cpu_to_be32(
             MANAGEMENT_ORB_RECONNECT(2) |
             MANAGEMENT_ORB_EXCLUSIVE(sbp2_param_exclusive_login));
         timeout = lu->tgt->mgt_orb_timeout;
     } else {
         timeout = SBP2_ORB_TIMEOUT;
     }
 
     init_completion(&orb->done);
     orb->base.callback = complete_management_orb;
 
     orb->base.request_bus =
         dma_map_single(device->card->device, &orb->request,
                    sizeof(orb->request), DMA_TO_DEVICE);
     if (dma_mapping_error(device->card->device, orb->base.request_bus))
         goto fail_mapping_request;
 
     sbp2_send_orb(&orb->base, lu, node_id, generation,
               lu->tgt->management_agent_address);
 
     wait_for_completion_timeout(&orb->done, msecs_to_jiffies(timeout));
 
     retval = -EIO;
     if (sbp2_cancel_orbs(lu) == 0) {
         dev_err(lu_dev(lu), "ORB reply timed out, rcode 0x%02x\n",
             orb->base.rcode);
         goto out;
     }
 
     if (orb->base.rcode != RCODE_COMPLETE) {
         dev_err(lu_dev(lu), "management write failed, rcode 0x%02x\n",
             orb->base.rcode);
         goto out;
     }
 
     if (STATUS_GET_RESPONSE(orb->status) != 0 ||
         STATUS_GET_SBP_STATUS(orb->status) != 0) {
         dev_err(lu_dev(lu), "error status: %d:%d\n",
              STATUS_GET_RESPONSE(orb->status),
              STATUS_GET_SBP_STATUS(orb->status));
         goto out;
     }
 
     retval = 0;
  out:
     dma_unmap_single(device->card->device, orb->base.request_bus,
              sizeof(orb->request), DMA_TO_DEVICE);
  fail_mapping_request:
     dma_unmap_single(device->card->device, orb->response_bus,
              sizeof(orb->response), DMA_FROM_DEVICE);
  fail_mapping_response:
     if (response)
         memcpy(response, orb->response, sizeof(orb->response));
     kref_put(&orb->base.kref, free_orb);
 
     return retval;
 }
 
 static void sbp2_agent_reset(struct sbp2_logical_unit *lu)
 {
     struct fw_device *device = target_parent_device(lu->tgt);
     __be32 d = 0;
 
     fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
                lu->tgt->node_id, lu->generation, device->max_speed,
                lu->command_block_agent_address + SBP2_AGENT_RESET,
                &d, 4);
 }
 
 static void complete_agent_reset_write_no_wait(struct fw_card *card,
         int rcode, void *payload, size_t length, void *data)
 {
     kfree(data);
 }
 
 static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu)
 {
     struct fw_device *device = target_parent_device(lu->tgt);
     struct fw_transaction *t;
     static __be32 d;
 
     t = kmalloc(sizeof(*t), GFP_ATOMIC);
     if (t == NULL)
         return;
 
     fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST,
             lu->tgt->node_id, lu->generation, device->max_speed,
             lu->command_block_agent_address + SBP2_AGENT_RESET,
             &d, 4, complete_agent_reset_write_no_wait, t);
 }
 
 static inline void sbp2_allow_block(struct sbp2_target *tgt)
 {
     spin_lock_irq(&tgt->lock);
     --tgt->dont_block;
     spin_unlock_irq(&tgt->lock);
 }
 
 /*
  * Blocks lu->tgt if all of the following conditions are met:
  *   - Login, INQUIRY, and high-level SCSI setup of all of the target's
  *     logical units have been finished (indicated by dont_block == 0).
  *   - lu->generation is stale.
  *
  * Note, scsi_block_requests() must be called while holding tgt->lock,
  * otherwise it might foil sbp2_[conditionally_]unblock()'s attempt to
  * unblock the target.
  */
 static void sbp2_conditionally_block(struct sbp2_logical_unit *lu)
 {
     struct sbp2_target *tgt = lu->tgt;
     struct fw_card *card = target_parent_device(tgt)->card;
     struct Scsi_Host *shost =
         container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
     unsigned long flags;
 
     spin_lock_irqsave(&tgt->lock, flags);
     if (!tgt->dont_block && !lu->blocked &&
         lu->generation != card->generation) {
         lu->blocked = true;
         if (++tgt->blocked == 1)
             scsi_block_requests(shost);
     }
     spin_unlock_irqrestore(&tgt->lock, flags);
 }
 
 /*
  * Unblocks lu->tgt as soon as all its logical units can be unblocked.
  * Note, it is harmless to run scsi_unblock_requests() outside the
  * tgt->lock protected section.  On the other hand, running it inside
  * the section might clash with shost->host_lock.
  */
 static void sbp2_conditionally_unblock(struct sbp2_logical_unit *lu)
 {
     struct sbp2_target *tgt = lu->tgt;
     struct fw_card *card = target_parent_device(tgt)->card;
     struct Scsi_Host *shost =
         container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
     bool unblock = false;
 
     spin_lock_irq(&tgt->lock);
     if (lu->blocked && lu->generation == card->generation) {
         lu->blocked = false;
         unblock = --tgt->blocked == 0;
     }
     spin_unlock_irq(&tgt->lock);
 
     if (unblock)
         scsi_unblock_requests(shost);
 }
 
 /*
  * Prevents future blocking of tgt and unblocks it.
  * Note, it is harmless to run scsi_unblock_requests() outside the
  * tgt->lock protected section.  On the other hand, running it inside
  * the section might clash with shost->host_lock.
  */
 static void sbp2_unblock(struct sbp2_target *tgt)
 {
     struct Scsi_Host *shost =
         container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
 
     spin_lock_irq(&tgt->lock);
     ++tgt->dont_block;
     spin_unlock_irq(&tgt->lock);
 
     scsi_unblock_requests(shost);
 }
 
 static int sbp2_lun2int(u16 lun)
 {
     struct scsi_lun eight_bytes_lun;
 
     memset(&eight_bytes_lun, 0, sizeof(eight_bytes_lun));
     eight_bytes_lun.scsi_lun[0] = (lun >> 8) & 0xff;
     eight_bytes_lun.scsi_lun[1] = lun & 0xff;
 
     return scsilun_to_int(&eight_bytes_lun);
 }
 
 /*
  * Write retransmit retry values into the BUSY_TIMEOUT register.
  * - The single-phase retry protocol is supported by all SBP-2 devices, but the
  *   default retry_limit value is 0 (i.e. never retry transmission). We write a
  *   saner value after logging into the device.
  * - The dual-phase retry protocol is optional to implement, and if not
  *   supported, writes to the dual-phase portion of the register will be
  *   ignored. We try to write the original 1394-1995 default here.
  * - In the case of devices that are also SBP-3-compliant, all writes are
  *   ignored, as the register is read-only, but contains single-phase retry of
  *   15, which is what we're trying to set for all SBP-2 device anyway, so this
  *   write attempt is safe and yields more consistent behavior for all devices.
  *
  * See section 8.3.2.3.5 of the 1394-1995 spec, section 6.2 of the SBP-2 spec,
  * and section 6.4 of the SBP-3 spec for further details.
  */
 static void sbp2_set_busy_timeout(struct sbp2_logical_unit *lu)
 {
     struct fw_device *device = target_parent_device(lu->tgt);
     __be32 d = cpu_to_be32(SBP2_CYCLE_LIMIT | SBP2_RETRY_LIMIT);
 
     fw_run_transaction(device->card, TCODE_WRITE_QUADLET_REQUEST,
                lu->tgt->node_id, lu->generation, device->max_speed,
                CSR_REGISTER_BASE + CSR_BUSY_TIMEOUT, &d, 4);
 }
 
 static void sbp2_reconnect(struct work_struct *work);
 
 static void sbp2_login(struct work_struct *work)
 {
     struct sbp2_logical_unit *lu =
         container_of(work, struct sbp2_logical_unit, work.work);
     struct sbp2_target *tgt = lu->tgt;
     struct fw_device *device = target_parent_device(tgt);
     struct Scsi_Host *shost;
     struct scsi_device *sdev;
     struct sbp2_login_response response;
     int generation, node_id, local_node_id;
 
     if (fw_device_is_shutdown(device))
         return;
 
     generation    = device->generation;
     smp_rmb();    /* node IDs must not be older than generation */
     node_id       = device->node_id;
     local_node_id = device->card->node_id;
 
     /* If this is a re-login attempt, log out, or we might be rejected. */
     if (lu->has_sdev)
         sbp2_send_management_orb(lu, device->node_id, generation,
                 SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
 
     if (sbp2_send_management_orb(lu, node_id, generation,
                 SBP2_LOGIN_REQUEST, lu->lun, &response) < 0) {
         if (lu->retries++ < 5) {
             sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
         } else {
             dev_err(tgt_dev(tgt), "failed to login to LUN %04x\n",
                 lu->lun);
             /* Let any waiting I/O fail from now on. */
             sbp2_unblock(lu->tgt);
         }
         return;
     }
 
     tgt->node_id      = node_id;
     tgt->address_high = local_node_id << 16;
     smp_wmb();    /* node IDs must not be older than generation */
     lu->generation    = generation;
 
     lu->command_block_agent_address =
         ((u64)(be32_to_cpu(response.command_block_agent.high) & 0xffff)
               << 32) | be32_to_cpu(response.command_block_agent.low);
     lu->login_id = be32_to_cpu(response.misc) & 0xffff;
 
     dev_notice(tgt_dev(tgt), "logged in to LUN %04x (%d retries)\n",
            lu->lun, lu->retries);
 
     /* set appropriate retry limit(s) in BUSY_TIMEOUT register */
     sbp2_set_busy_timeout(lu);
 
     lu->workfn = sbp2_reconnect;
     sbp2_agent_reset(lu);
 
     /* This was a re-login. */
     if (lu->has_sdev) {
         sbp2_cancel_orbs(lu);
         sbp2_conditionally_unblock(lu);
 
         return;
     }
 
     if (lu->tgt->workarounds & SBP2_WORKAROUND_DELAY_INQUIRY)
         ssleep(SBP2_INQUIRY_DELAY);
 
     shost = container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
     sdev = __scsi_add_device(shost, 0, 0, sbp2_lun2int(lu->lun), lu);
     /*
      * FIXME:  We are unable to perform reconnects while in sbp2_login().
      * Therefore __scsi_add_device() will get into trouble if a bus reset
      * happens in parallel.  It will either fail or leave us with an
      * unusable sdev.  As a workaround we check for this and retry the
      * whole login and SCSI probing.
      */
 
     /* Reported error during __scsi_add_device() */
     if (IS_ERR(sdev))
         goto out_logout_login;
 
     /* Unreported error during __scsi_add_device() */
     smp_rmb(); /* get current card generation */
     if (generation != device->card->generation) {
         scsi_remove_device(sdev);
         scsi_device_put(sdev);
         goto out_logout_login;
     }
 
     /* No error during __scsi_add_device() */
     lu->has_sdev = true;
     scsi_device_put(sdev);
     sbp2_allow_block(tgt);
 
     return;
 
  out_logout_login:
     smp_rmb(); /* generation may have changed */
     generation = device->generation;
     smp_rmb(); /* node_id must not be older than generation */
 
     sbp2_send_management_orb(lu, device->node_id, generation,
                  SBP2_LOGOUT_REQUEST, lu->login_id, NULL);
     /*
      * If a bus reset happened, sbp2_update will have requeued
      * lu->work already.  Reset the work from reconnect to login.
      */
     lu->workfn = sbp2_login;
 }
 
 static void sbp2_reconnect(struct work_struct *work)
 {
     struct sbp2_logical_unit *lu =
         container_of(work, struct sbp2_logical_unit, work.work);
     struct sbp2_target *tgt = lu->tgt;
     struct fw_device *device = target_parent_device(tgt);
     int generation, node_id, local_node_id;
 
     if (fw_device_is_shutdown(device))
         return;
 
     generation    = device->generation;
     smp_rmb();    /* node IDs must not be older than generation */
     node_id       = device->node_id;
     local_node_id = device->card->node_id;
 
     if (sbp2_send_management_orb(lu, node_id, generation,
                      SBP2_RECONNECT_REQUEST,
                      lu->login_id, NULL) < 0) {
         /*
          * If reconnect was impossible even though we are in the
          * current generation, fall back and try to log in again.
          *
          * We could check for "Function rejected" status, but
          * looking at the bus generation as simpler and more general.
          */
         smp_rmb(); /* get current card generation */
         if (generation == device->card->generation ||
             lu->retries++ >= 5) {
             dev_err(tgt_dev(tgt), "failed to reconnect\n");
             lu->retries = 0;
             lu->workfn = sbp2_login;
         }
         sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
 
         return;
     }
 
     tgt->node_id      = node_id;
     tgt->address_high = local_node_id << 16;
     smp_wmb();    /* node IDs must not be older than generation */
     lu->generation    = generation;
 
     dev_notice(tgt_dev(tgt), "reconnected to LUN %04x (%d retries)\n",
            lu->lun, lu->retries);
 
     sbp2_agent_reset(lu);
     sbp2_cancel_orbs(lu);
     sbp2_conditionally_unblock(lu);
 }
 
 static void sbp2_lu_workfn(struct work_struct *work)
 {
     struct sbp2_logical_unit *lu = container_of(to_delayed_work(work),
                         struct sbp2_logical_unit, work);
     lu->workfn(work);
 }
 
 static int sbp2_add_logical_unit(struct sbp2_target *tgt, int lun_entry)
 {
     struct sbp2_logical_unit *lu;
 
     lu = kmalloc(sizeof(*lu), GFP_KERNEL);
     if (!lu)
         return -ENOMEM;
 
     lu->address_handler.length           = 0x100;
     lu->address_handler.address_callback = sbp2_status_write;
     lu->address_handler.callback_data    = lu;
 
     if (fw_core_add_address_handler(&lu->address_handler,
                     &fw_high_memory_region) < 0) {
         kfree(lu);
         return -ENOMEM;
     }
 
     lu->tgt      = tgt;
     lu->lun      = lun_entry & 0xffff;
     lu->login_id = INVALID_LOGIN_ID;
     lu->retries  = 0;
     lu->has_sdev = false;
     lu->blocked  = false;
     ++tgt->dont_block;
     INIT_LIST_HEAD(&lu->orb_list);
     lu->workfn = sbp2_login;
     INIT_DELAYED_WORK(&lu->work, sbp2_lu_workfn);
 
     list_add_tail(&lu->link, &tgt->lu_list);
     return 0;
 }
 
 static void sbp2_get_unit_unique_id(struct sbp2_target *tgt,
                     const u32 *leaf)
 {
     if ((leaf[0] & 0xffff0000) == 0x00020000)
         tgt->guid = (u64)leaf[1] << 32 | leaf[2];
 }
 
 static int sbp2_scan_logical_unit_dir(struct sbp2_target *tgt,
                       const u32 *directory)
 {
     struct fw_csr_iterator ci;
     int key, value;
 
     fw_csr_iterator_init(&ci, directory);
     while (fw_csr_iterator_next(&ci, &key, &value))
         if (key == SBP2_CSR_LOGICAL_UNIT_NUMBER &&
             sbp2_add_logical_unit(tgt, value) < 0)
             return -ENOMEM;
     return 0;
 }
 
 static int sbp2_scan_unit_dir(struct sbp2_target *tgt, const u32 *directory,
                   u32 *model, u32 *firmware_revision)
 {
     struct fw_csr_iterator ci;
     int key, value;
 
     fw_csr_iterator_init(&ci, directory);
     while (fw_csr_iterator_next(&ci, &key, &value)) {
         switch (key) {
 
         case CSR_DEPENDENT_INFO | CSR_OFFSET:
             tgt->management_agent_address =
                     CSR_REGISTER_BASE + 4 * value;
             break;
 
         case CSR_DIRECTORY_ID:
             tgt->directory_id = value;
             break;
 
         case CSR_MODEL:
             *model = value;
             break;
 
         case SBP2_CSR_FIRMWARE_REVISION:
             *firmware_revision = value;
             break;
 
         case SBP2_CSR_UNIT_CHARACTERISTICS:
             /* the timeout value is stored in 500ms units */
             tgt->mgt_orb_timeout = (value >> 8 & 0xff) * 500;
             break;
 
         case SBP2_CSR_LOGICAL_UNIT_NUMBER:
             if (sbp2_add_logical_unit(tgt, value) < 0)
                 return -ENOMEM;
             break;
 
         case SBP2_CSR_UNIT_UNIQUE_ID:
             sbp2_get_unit_unique_id(tgt, ci.p - 1 + value);
             break;
 
         case SBP2_CSR_LOGICAL_UNIT_DIRECTORY:
             /* Adjust for the increment in the iterator */
             if (sbp2_scan_logical_unit_dir(tgt, ci.p - 1 + value) < 0)
                 return -ENOMEM;
             break;
         }
     }
     return 0;
 }
 
 /*
  * Per section 7.4.8 of the SBP-2 spec, a mgt_ORB_timeout value can be
  * provided in the config rom. Most devices do provide a value, which
  * we'll use for login management orbs, but with some sane limits.
  */
 static void sbp2_clamp_management_orb_timeout(struct sbp2_target *tgt)
 {
     unsigned int timeout = tgt->mgt_orb_timeout;
 
     if (timeout > 40000)
         dev_notice(tgt_dev(tgt), "%ds mgt_ORB_timeout limited to 40s\n",
                timeout / 1000);
 
     tgt->mgt_orb_timeout = clamp_val(timeout, 5000, 40000);
 }
 
 static void sbp2_init_workarounds(struct sbp2_target *tgt, u32 model,
                   u32 firmware_revision)
 {
     int i;
     unsigned int w = sbp2_param_workarounds;
 
     if (w)
         dev_notice(tgt_dev(tgt),
                "Please notify linux1394-devel@lists.sf.net "
                "if you need the workarounds parameter\n");
 
     if (w & SBP2_WORKAROUND_OVERRIDE)
         goto out;
 
     for (i = 0; i < ARRAY_SIZE(sbp2_workarounds_table); i++) {
 
         if (sbp2_workarounds_table[i].firmware_revision !=
             (firmware_revision & 0xffffff00))
             continue;
 
         if (sbp2_workarounds_table[i].model != model &&
             sbp2_workarounds_table[i].model != SBP2_ROM_VALUE_WILDCARD)
             continue;
 
         w |= sbp2_workarounds_table[i].workarounds;
         break;
     }
  out:
     if (w)
         dev_notice(tgt_dev(tgt), "workarounds 0x%x "
                "(firmware_revision 0x%06x, model_id 0x%06x)\n",
                w, firmware_revision, model);
     tgt->workarounds = w;
 }
 
 static struct scsi_host_template scsi_driver_template;
 static void sbp2_remove(struct fw_unit *unit);
 
 static int sbp2_probe(struct fw_unit *unit, const struct ieee1394_device_id *id)
 {
     struct fw_device *device = fw_parent_device(unit);
     struct sbp2_target *tgt;
     struct sbp2_logical_unit *lu;
     struct Scsi_Host *shost;
     u32 model, firmware_revision;
 
     /* cannot (or should not) handle targets on the local node */
     if (device->is_local)
         return -ENODEV;
 
     shost = scsi_host_alloc(&scsi_driver_template, sizeof(*tgt));
     if (shost == NULL)
         return -ENOMEM;
 
     tgt = (struct sbp2_target *)shost->hostdata;
     dev_set_drvdata(&unit->device, tgt);
     tgt->unit = unit;
     INIT_LIST_HEAD(&tgt->lu_list);
     spin_lock_init(&tgt->lock);
     tgt->guid = (u64)device->config_rom[3] << 32 | device->config_rom[4];
 
     if (fw_device_enable_phys_dma(device) < 0)
         goto fail_shost_put;
 
     shost->max_cmd_len = SBP2_MAX_CDB_SIZE;
 
     if (scsi_add_host_with_dma(shost, &unit->device,
                    device->card->device) < 0)
         goto fail_shost_put;
 
     /* implicit directory ID */
     tgt->directory_id = ((unit->directory - device->config_rom) * 4
                  + CSR_CONFIG_ROM) & 0xffffff;
 
     firmware_revision = SBP2_ROM_VALUE_MISSING;
     model         = SBP2_ROM_VALUE_MISSING;
 
     if (sbp2_scan_unit_dir(tgt, unit->directory, &model,
                    &firmware_revision) < 0)
         goto fail_remove;
 
     sbp2_clamp_management_orb_timeout(tgt);
     sbp2_init_workarounds(tgt, model, firmware_revision);
 
     /*
      * At S100 we can do 512 bytes per packet, at S200 1024 bytes,
      * and so on up to 4096 bytes.  The SBP-2 max_payload field
      * specifies the max payload size as 2 ^ (max_payload + 2), so
      * if we set this to max_speed + 7, we get the right value.
      */
     tgt->max_payload = min3(device->max_speed + 7, 10U,
                 device->card->max_receive - 1);
 
     /* Do the login in a workqueue so we can easily reschedule retries. */
     list_for_each_entry(lu, &tgt->lu_list, link)
         sbp2_queue_work(lu, DIV_ROUND_UP(HZ, 5));
 
     return 0;
 
  fail_remove:
     sbp2_remove(unit);
     return -ENOMEM;
 
  fail_shost_put:
     scsi_host_put(shost);
     return -ENOMEM;
 }
 
 static void sbp2_update(struct fw_unit *unit)
 {
     struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
     struct sbp2_logical_unit *lu;
 
     fw_device_enable_phys_dma(fw_parent_device(unit));
 
     /*
      * Fw-core serializes sbp2_update() against sbp2_remove().
      * Iteration over tgt->lu_list is therefore safe here.
      */
     list_for_each_entry(lu, &tgt->lu_list, link) {
         sbp2_conditionally_block(lu);
         lu->retries = 0;
         sbp2_queue_work(lu, 0);
     }
 }
 
 static void sbp2_remove(struct fw_unit *unit)
 {
     struct fw_device *device = fw_parent_device(unit);
     struct sbp2_target *tgt = dev_get_drvdata(&unit->device);
     struct sbp2_logical_unit *lu, *next;
     struct Scsi_Host *shost =
         container_of((void *)tgt, struct Scsi_Host, hostdata[0]);
     struct scsi_device *sdev;
 
     /* prevent deadlocks */
     sbp2_unblock(tgt);
 
     list_for_each_entry_safe(lu, next, &tgt->lu_list, link) {
         cancel_delayed_work_sync(&lu->work);
         sdev = scsi_device_lookup(shost, 0, 0, sbp2_lun2int(lu->lun));
         if (sdev) {
             scsi_remove_device(sdev);
             scsi_device_put(sdev);
         }
         if (lu->login_id != INVALID_LOGIN_ID) {
             int generation, node_id;
             /*
              * tgt->node_id may be obsolete here if we failed
              * during initial login or after a bus reset where
              * the topology changed.
              */
             generation = device->generation;
             smp_rmb(); /* node_id vs. generation */
             node_id    = device->node_id;
             sbp2_send_management_orb(lu, node_id, generation,
                          SBP2_LOGOUT_REQUEST,
                          lu->login_id, NULL);
         }
         fw_core_remove_address_handler(&lu->address_handler);
         list_del(&lu->link);
         kfree(lu);
     }
     scsi_remove_host(shost);
     dev_notice(&unit->device, "released target %d:0:0\n", shost->host_no);
 
     scsi_host_put(shost);
 }
 
 #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
 #define SBP2_SW_VERSION_ENTRY   0x00010483
 
 static const struct ieee1394_device_id sbp2_id_table[] = {
     {
         .match_flags  = IEEE1394_MATCH_SPECIFIER_ID |
                 IEEE1394_MATCH_VERSION,
         .specifier_id = SBP2_UNIT_SPEC_ID_ENTRY,
         .version      = SBP2_SW_VERSION_ENTRY,
     },
     { }
 };
 
 static struct fw_driver sbp2_driver = {
     .driver   = {
         .owner  = THIS_MODULE,
         .name   = KBUILD_MODNAME,
         .bus    = &fw_bus_type,
     },
     .probe    = sbp2_probe,
     .update   = sbp2_update,
     .remove   = sbp2_remove,
     .id_table = sbp2_id_table,
 };
 
 static void sbp2_unmap_scatterlist(struct device *card_device,
                    struct sbp2_command_orb *orb)
 {
     scsi_dma_unmap(orb->cmd);
 
     if (orb->request.misc & cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT))
         dma_unmap_single(card_device, orb->page_table_bus,
                  sizeof(orb->page_table), DMA_TO_DEVICE);
 }
 
 static unsigned int sbp2_status_to_sense_data(u8 *sbp2_status, u8 *sense_data)
 {
     int sam_status;
     int sfmt = (sbp2_status[0] >> 6) & 0x03;
 
     if (sfmt == 2 || sfmt == 3) {
         /*
          * Reserved for future standardization (2) or
          * Status block format vendor-dependent (3)
          */
         return DID_ERROR << 16;
     }
 
     sense_data[0] = 0x70 | sfmt | (sbp2_status[1] & 0x80);
     sense_data[1] = 0x0;
     sense_data[2] = ((sbp2_status[1] << 1) & 0xe0) | (sbp2_status[1] & 0x0f);
     sense_data[3] = sbp2_status[4];
     sense_data[4] = sbp2_status[5];
     sense_data[5] = sbp2_status[6];
     sense_data[6] = sbp2_status[7];
     sense_data[7] = 10;
     sense_data[8] = sbp2_status[8];
     sense_data[9] = sbp2_status[9];
     sense_data[10] = sbp2_status[10];
     sense_data[11] = sbp2_status[11];
     sense_data[12] = sbp2_status[2];
     sense_data[13] = sbp2_status[3];
     sense_data[14] = sbp2_status[12];
     sense_data[15] = sbp2_status[13];
 
     sam_status = sbp2_status[0] & 0x3f;
 
     switch (sam_status) {
     case SAM_STAT_GOOD:
     case SAM_STAT_CHECK_CONDITION:
     case SAM_STAT_CONDITION_MET:
     case SAM_STAT_BUSY:
     case SAM_STAT_RESERVATION_CONFLICT:
     case SAM_STAT_COMMAND_TERMINATED:
         return DID_OK << 16 | sam_status;
 
     default:
         return DID_ERROR << 16;
     }
 }
 
 static void complete_command_orb(struct sbp2_orb *base_orb,
                  struct sbp2_status *status)
 {
     struct sbp2_command_orb *orb =
         container_of(base_orb, struct sbp2_command_orb, base);
     struct fw_device *device = target_parent_device(base_orb->lu->tgt);
     int result;
 
     if (status != NULL) {
         if (STATUS_GET_DEAD(*status))
             sbp2_agent_reset_no_wait(base_orb->lu);
 
         switch (STATUS_GET_RESPONSE(*status)) {
         case SBP2_STATUS_REQUEST_COMPLETE:
             result = DID_OK << 16;
             break;
         case SBP2_STATUS_TRANSPORT_FAILURE:
             result = DID_BUS_BUSY << 16;
             break;
         case SBP2_STATUS_ILLEGAL_REQUEST:
         case SBP2_STATUS_VENDOR_DEPENDENT:
         default:
             result = DID_ERROR << 16;
             break;
         }
 
         if (result == DID_OK << 16 && STATUS_GET_LEN(*status) > 1)
             result = sbp2_status_to_sense_data(STATUS_GET_DATA(*status),
                                orb->cmd->sense_buffer);
     } else {
         /*
          * If the orb completes with status == NULL, something
          * went wrong, typically a bus reset happened mid-orb
          * or when sending the write (less likely).
          */
         result = DID_BUS_BUSY << 16;
         sbp2_conditionally_block(base_orb->lu);
     }
 
     dma_unmap_single(device->card->device, orb->base.request_bus,
              sizeof(orb->request), DMA_TO_DEVICE);
     sbp2_unmap_scatterlist(device->card->device, orb);
 
     orb->cmd->result = result;
     scsi_done(orb->cmd);
 }
 
 static int sbp2_map_scatterlist(struct sbp2_command_orb *orb,
         struct fw_device *device, struct sbp2_logical_unit *lu)
 {
     struct scatterlist *sg = scsi_sglist(orb->cmd);
     int i, n;
 
     n = scsi_dma_map(orb->cmd);
     if (n <= 0)
         goto fail;
 
     /*
      * Handle the special case where there is only one element in
      * the scatter list by converting it to an immediate block
      * request. This is also a workaround for broken devices such
      * as the second generation iPod which doesn't support page
      * tables.
      */
     if (n == 1) {
         orb->request.data_descriptor.high =
             cpu_to_be32(lu->tgt->address_high);
         orb->request.data_descriptor.low  =
             cpu_to_be32(sg_dma_address(sg));
         orb->request.misc |=
             cpu_to_be32(COMMAND_ORB_DATA_SIZE(sg_dma_len(sg)));
         return 0;
     }
 
     for_each_sg(sg, sg, n, i) {
         orb->page_table[i].high = cpu_to_be32(sg_dma_len(sg) << 16);
         orb->page_table[i].low = cpu_to_be32(sg_dma_address(sg));
     }
 
     orb->page_table_bus =
         dma_map_single(device->card->device, orb->page_table,
                    sizeof(orb->page_table), DMA_TO_DEVICE);
     if (dma_mapping_error(device->card->device, orb->page_table_bus))
         goto fail_page_table;
 
     /*
      * The data_descriptor pointer is the one case where we need
      * to fill in the node ID part of the address.  All other
      * pointers assume that the data referenced reside on the
      * initiator (i.e. us), but data_descriptor can refer to data
      * on other nodes so we need to put our ID in descriptor.high.
      */
     orb->request.data_descriptor.high = cpu_to_be32(lu->tgt->address_high);
     orb->request.data_descriptor.low  = cpu_to_be32(orb->page_table_bus);
     orb->request.misc |= cpu_to_be32(COMMAND_ORB_PAGE_TABLE_PRESENT |
                      COMMAND_ORB_DATA_SIZE(n));
 
     return 0;
 
  fail_page_table:
     scsi_dma_unmap(orb->cmd);
  fail:
     return -ENOMEM;
 }
 
 /* SCSI stack integration */
 
 static int sbp2_scsi_queuecommand(struct Scsi_Host *shost,
                   struct scsi_cmnd *cmd)
 {
     struct sbp2_logical_unit *lu = cmd->device->hostdata;
     struct fw_device *device = target_parent_device(lu->tgt);
     struct sbp2_command_orb *orb;
     int generation, retval = SCSI_MLQUEUE_HOST_BUSY;
 
     orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
     if (orb == NULL)
         return SCSI_MLQUEUE_HOST_BUSY;
 
     /* Initialize rcode to something not RCODE_COMPLETE. */
     orb->base.rcode = -1;
     kref_init(&orb->base.kref);
     orb->cmd = cmd;
     orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
     orb->request.misc = cpu_to_be32(
         COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) |
         COMMAND_ORB_SPEED(device->max_speed) |
         COMMAND_ORB_NOTIFY);
 
     if (cmd->sc_data_direction == DMA_FROM_DEVICE)
         orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);
 
     generation = device->generation;
     smp_rmb();    /* sbp2_map_scatterlist looks at tgt->address_high */
 
     if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
         goto out;
 
     memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len);
 
     orb->base.callback = complete_command_orb;
     orb->base.request_bus =
         dma_map_single(device->card->device, &orb->request,
                    sizeof(orb->request), DMA_TO_DEVICE);
     if (dma_mapping_error(device->card->device, orb->base.request_bus)) {
         sbp2_unmap_scatterlist(device->card->device, orb);
         goto out;
     }
 
     sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
               lu->command_block_agent_address + SBP2_ORB_POINTER);
     retval = 0;
  out:
     kref_put(&orb->base.kref, free_orb);
     return retval;
 }
 
 static int sbp2_scsi_slave_alloc(struct scsi_device *sdev)
 {
     struct sbp2_logical_unit *lu = sdev->hostdata;
 
     /* (Re-)Adding logical units via the SCSI stack is not supported. */
     if (!lu)
         return -ENOSYS;
 
     sdev->allow_restart = 1;
 
     /*
      * SBP-2 does not require any alignment, but we set it anyway
      * for compatibility with earlier versions of this driver.
      */
     blk_queue_update_dma_alignment(sdev->request_queue, 4 - 1);
 
     if (lu->tgt->workarounds & SBP2_WORKAROUND_INQUIRY_36)
         sdev->inquiry_len = 36;
 
     return 0;
 }
 
 static int sbp2_scsi_slave_configure(struct scsi_device *sdev)
 {
     struct sbp2_logical_unit *lu = sdev->hostdata;
 
     sdev->use_10_for_rw = 1;
 
     if (sbp2_param_exclusive_login)
         sdev->manage_start_stop = 1;
 
     if (sdev->type == TYPE_ROM)
         sdev->use_10_for_ms = 1;
 
     if (sdev->type == TYPE_DISK &&
         lu->tgt->workarounds & SBP2_WORKAROUND_MODE_SENSE_8)
         sdev->skip_ms_page_8 = 1;
 
     if (lu->tgt->workarounds & SBP2_WORKAROUND_FIX_CAPACITY)
         sdev->fix_capacity = 1;
 
     if (lu->tgt->workarounds & SBP2_WORKAROUND_POWER_CONDITION)
         sdev->start_stop_pwr_cond = 1;
 
     if (lu->tgt->workarounds & SBP2_WORKAROUND_128K_MAX_TRANS)
         blk_queue_max_hw_sectors(sdev->request_queue, 128 * 1024 / 512);
 
     return 0;
 }
 
 /*
  * Called by scsi stack when something has really gone wrong.  Usually
  * called when a command has timed-out for some reason.
  */
 static int sbp2_scsi_abort(struct scsi_cmnd *cmd)
 {
     struct sbp2_logical_unit *lu = cmd->device->hostdata;
 
     dev_notice(lu_dev(lu), "sbp2_scsi_abort\n");
     sbp2_agent_reset(lu);
     sbp2_cancel_orbs(lu);
 
     return SUCCESS;
 }
 
 /*
  * Format of /sys/bus/scsi/devices/.../ieee1394_id:
  * u64 EUI-64 : u24 directory_ID : u16 LUN  (all printed in hexadecimal)
  *
  * This is the concatenation of target port identifier and logical unit
  * identifier as per SAM-2...SAM-4 annex A.
  */
 static ssize_t sbp2_sysfs_ieee1394_id_show(struct device *dev,
             struct device_attribute *attr, char *buf)
 {
     struct scsi_device *sdev = to_scsi_device(dev);
     struct sbp2_logical_unit *lu;
 
     if (!sdev)
         return 0;
 
     lu = sdev->hostdata;
 
     return sprintf(buf, "%016llx:%06x:%04x\n",
             (unsigned long long)lu->tgt->guid,
             lu->tgt->directory_id, lu->lun);
 }
 
 static DEVICE_ATTR(ieee1394_id, S_IRUGO, sbp2_sysfs_ieee1394_id_show, NULL);
 
 static struct attribute *sbp2_scsi_sysfs_attrs[] = {
     &dev_attr_ieee1394_id.attr,
     NULL
 };
 
 ATTRIBUTE_GROUPS(sbp2_scsi_sysfs);
 
 static struct scsi_host_template scsi_driver_template = {
     .module         = THIS_MODULE,
     .name           = "SBP-2 IEEE-1394",
     .proc_name      = "sbp2",
     .queuecommand       = sbp2_scsi_queuecommand,
     .slave_alloc        = sbp2_scsi_slave_alloc,
     .slave_configure    = sbp2_scsi_slave_configure,
     .eh_abort_handler   = sbp2_scsi_abort,
     .this_id        = -1,
     .sg_tablesize       = SG_ALL,
     .max_segment_size   = SBP2_MAX_SEG_SIZE,
     .can_queue      = 1,
     .sdev_groups        = sbp2_scsi_sysfs_groups,
 };
 
 MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
 MODULE_DESCRIPTION("SCSI over IEEE1394");
 MODULE_LICENSE("GPL");
 MODULE_DEVICE_TABLE(ieee1394, sbp2_id_table);
 
 /* Provide a module alias so root-on-sbp2 initrds don't break. */
 MODULE_ALIAS("sbp2");
 
 static int __init sbp2_init(void)
 {
     return driver_register(&sbp2_driver.driver);
 }
 
 static void __exit sbp2_cleanup(void)
 {
     driver_unregister(&sbp2_driver.driver);
 }
 
 module_init(sbp2_init);
 module_exit(sbp2_cleanup);

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