scsi: hpsa: cleanup reset handler

- mark device state sooner.

Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index a2852da..20b4e83 100644 (file)
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1859,10 +1859,13 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h,
         * A reset can cause a device status to change
         * re-schedule the scan to see what happened.
         */
+       spin_lock_irqsave(&h->reset_lock, flags);
        if (h->reset_in_progress) {
                h->drv_req_rescan = 1;
+               spin_unlock_irqrestore(&h->reset_lock, flags);
                return;
        }
+       spin_unlock_irqrestore(&h->reset_lock, flags);
 
        added = kzalloc(sizeof(*added) * HPSA_MAX_DEVICES, GFP_KERNEL);
        removed = kzalloc(sizeof(*removed) * HPSA_MAX_DEVICES, GFP_KERNEL);
@@ -5618,11 +5621,14 @@ static void hpsa_scan_start(struct Scsi_Host *sh)
        /*
         * Do the scan after a reset completion
         */
+       spin_lock_irqsave(&h->reset_lock, flags);
        if (h->reset_in_progress) {
                h->drv_req_rescan = 1;
+               spin_unlock_irqrestore(&h->reset_lock, flags);
                hpsa_scan_complete(h);
                return;
        }
+       spin_unlock_irqrestore(&h->reset_lock, flags);
 
        hpsa_update_scsi_devices(h);
 
@@ -5834,28 +5840,38 @@ static int wait_for_device_to_become_ready(struct ctlr_info *h,
  */
 static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
 {
-       int rc;
+       int rc = SUCCESS;
        struct ctlr_info *h;
        struct hpsa_scsi_dev_t *dev;
        u8 reset_type;
        char msg[48];
+       unsigned long flags;
 
        /* find the controller to which the command to be aborted was sent */
        h = sdev_to_hba(scsicmd->device);
        if (h == NULL) /* paranoia */
                return FAILED;
 
-       if (lockup_detected(h))
-               return FAILED;
+       spin_lock_irqsave(&h->reset_lock, flags);
+       h->reset_in_progress = 1;
+       spin_unlock_irqrestore(&h->reset_lock, flags);
+
+       if (lockup_detected(h)) {
+               rc = FAILED;
+               goto return_reset_status;
+       }
 
        dev = scsicmd->device->hostdata;
        if (!dev) {
                dev_err(&h->pdev->dev, "%s: device lookup failed\n", __func__);
-               return FAILED;
+               rc = FAILED;
+               goto return_reset_status;
        }
 
-       if (dev->devtype == TYPE_ENCLOSURE)
-               return SUCCESS;
+       if (dev->devtype == TYPE_ENCLOSURE) {
+               rc = SUCCESS;
+               goto return_reset_status;
+       }
 
        /* if controller locked up, we can guarantee command won't complete */
        if (lockup_detected(h)) {
@@ -5863,7 +5879,8 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
                         "cmd %d RESET FAILED, lockup detected",
                         hpsa_get_cmd_index(scsicmd));
                hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
-               return FAILED;
+               rc = FAILED;
+               goto return_reset_status;
        }
 
        /* this reset request might be the result of a lockup; check */
@@ -5872,12 +5889,15 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
                         "cmd %d RESET FAILED, new lockup detected",
                         hpsa_get_cmd_index(scsicmd));
                hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
-               return FAILED;
+               rc = FAILED;
+               goto return_reset_status;
        }
 
        /* Do not attempt on controller */
-       if (is_hba_lunid(dev->scsi3addr))
-               return SUCCESS;
+       if (is_hba_lunid(dev->scsi3addr)) {
+               rc = SUCCESS;
+               goto return_reset_status;
+       }
 
        if (is_logical_dev_addr_mode(dev->scsi3addr))
                reset_type = HPSA_DEVICE_RESET_MSG;
@@ -5888,17 +5908,24 @@ static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
                reset_type == HPSA_DEVICE_RESET_MSG ? "logical " : "physical ");
        hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
 
-       h->reset_in_progress = 1;
-
        /* send a reset to the SCSI LUN which the command was sent to */
        rc = hpsa_do_reset(h, dev, dev->scsi3addr, reset_type,
                           DEFAULT_REPLY_QUEUE);
+       if (rc == 0)
+               rc = SUCCESS;
+       else
+               rc = FAILED;
+
        sprintf(msg, "reset %s %s",
                reset_type == HPSA_DEVICE_RESET_MSG ? "logical " : "physical ",
-               rc == 0 ? "completed successfully" : "failed");
+               rc == SUCCESS ? "completed successfully" : "failed");
        hpsa_show_dev_msg(KERN_WARNING, h, dev, msg);
+
+return_reset_status:
+       spin_lock_irqsave(&h->reset_lock, flags);
        h->reset_in_progress = 0;
-       return rc == 0 ? SUCCESS : FAILED;
+       spin_unlock_irqrestore(&h->reset_lock, flags);
+       return rc;
 }
 
 static void swizzle_abort_tag(u8 *tag)
@@ -8649,10 +8676,13 @@ static void hpsa_rescan_ctlr_worker(struct work_struct *work)
        /*
         * Do the scan after the reset
         */
+       spin_lock_irqsave(&h->reset_lock, flags);
        if (h->reset_in_progress) {
                h->drv_req_rescan = 1;
+               spin_unlock_irqrestore(&h->reset_lock, flags);
                return;
        }
+       spin_unlock_irqrestore(&h->reset_lock, flags);
 
        if (hpsa_ctlr_needs_rescan(h) || hpsa_offline_devices_ready(h)) {
                scsi_host_get(h->scsi_host);
@@ -8759,6 +8789,7 @@ reinit_after_soft_reset:
        spin_lock_init(&h->lock);
        spin_lock_init(&h->offline_device_lock);
        spin_lock_init(&h->scan_lock);
+       spin_lock_init(&h->reset_lock);
        atomic_set(&h->passthru_cmds_avail, HPSA_MAX_CONCURRENT_PASSTHRUS);
        atomic_set(&h->abort_cmds_available, HPSA_CMDS_RESERVED_FOR_ABORTS);
 

diff --git a/drivers/scsi/hpsa.h b/drivers/scsi/hpsa.h
index 6f04f2a..5352664 100644 (file)
--- a/drivers/scsi/hpsa.h
+++ b/drivers/scsi/hpsa.h
@@ -301,6 +301,7 @@ struct ctlr_info {
        struct mutex reset_mutex;
        u8 reset_in_progress;
        struct hpsa_sas_node *sas_host;
+       spinlock_t reset_lock;
 };
 
 struct offline_device_entry {