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[SCSI] hpsa: do not attempt to flush the cache on locked up controllers

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There's no point in trying since it can't work, and if you do
try, it will just hang the system on shutdown.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Stephen M. Cameron 2013-09-23 13:33:30 -05:00 committed by James Bottomley
parent 6627b38fd9
commit 702890e3b9
1 changed files with 9 additions and 0 deletions
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9
drivers/scsi/hpsa.c
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@ -4942,6 +4942,15 @@ static void hpsa_flush_cache(struct ctlr_info *h)
{
char *flush_buf;
struct CommandList *c;
unsigned long flags;
/* Don't bother trying to flush the cache if locked up */
spin_lock_irqsave(&h->lock, flags);
if (unlikely(h->lockup_detected)) {
spin_unlock_irqrestore(&h->lock, flags);
return;
}
spin_unlock_irqrestore(&h->lock, flags);
flush_buf = kzalloc(4, GFP_KERNEL);
if (!flush_buf)