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scsi: hpsa: limit outstanding rescans

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Avoid rescan storms. No need to queue another if one is pending.

Reviewed-by: Scott Benesh <scott.benesh@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Don Brace 2017-03-10 14:35:17 -06:00 committed by Martin K. Petersen
parent 85b29008d8
commit 87b9e6aa87
2 changed files with 16 additions and 1 deletions
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16
drivers/scsi/hpsa.c
View File

@ -5555,7 +5555,7 @@ static void hpsa_scan_complete(struct ctlr_info *h)
spin_lock_irqsave(&h->scan_lock, flags);
h->scan_finished = 1;
wake_up_all(&h->scan_wait_queue);
wake_up(&h->scan_wait_queue);
spin_unlock_irqrestore(&h->scan_lock, flags);
}
@ -5573,11 +5573,23 @@ static void hpsa_scan_start(struct Scsi_Host *sh)
if (unlikely(lockup_detected(h)))
return hpsa_scan_complete(h);
/*
* If a scan is already waiting to run, no need to add another
*/
spin_lock_irqsave(&h->scan_lock, flags);
if (h->scan_waiting) {
spin_unlock_irqrestore(&h->scan_lock, flags);
return;
}
spin_unlock_irqrestore(&h->scan_lock, flags);
/* wait until any scan already in progress is finished. */
while (1) {
spin_lock_irqsave(&h->scan_lock, flags);
if (h->scan_finished)
break;
h->scan_waiting = 1;
spin_unlock_irqrestore(&h->scan_lock, flags);
wait_event(h->scan_wait_queue, h->scan_finished);
/* Note: We don't need to worry about a race between this
@ -5587,6 +5599,7 @@ static void hpsa_scan_start(struct Scsi_Host *sh)
*/
}
h->scan_finished = 0; /* mark scan as in progress */
h->scan_waiting = 0;
spin_unlock_irqrestore(&h->scan_lock, flags);
if (unlikely(lockup_detected(h)))
@ -8789,6 +8802,7 @@ reinit_after_soft_reset:
init_waitqueue_head(&h->event_sync_wait_queue);
mutex_init(&h->reset_mutex);
h->scan_finished = 1; /* no scan currently in progress */
h->scan_waiting = 0;
pci_set_drvdata(pdev, h);
h->ndevices = 0;

1
drivers/scsi/hpsa.h
View File

@ -201,6 +201,7 @@ struct ctlr_info {
dma_addr_t errinfo_pool_dhandle;
unsigned long *cmd_pool_bits;
int scan_finished;
u8 scan_waiting : 1;
spinlock_t scan_lock;
wait_queue_head_t scan_wait_queue;