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

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)