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raid5: Use slow_path to release stripe when mddev->thread is null

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When release_stripe() is called in grow_one_stripe(), the
mddev->thread is null. So it will omit one wakeup this thread to
release stripe.
For this condition, use slow_path to release stripe.

Bug was introduced in 3.12

Cc: stable@vger.kernel.org (3.12+)
Fixes: 773ca82fa1ee58dd1bf88b
Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
majianpeng 2013-11-14 15:16:15 +11:00 committed by NeilBrown
parent 39cf275a1a
commit ad4068de49
1 changed files with 2 additions and 1 deletions
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3
drivers/md/raid5.c
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@ -340,7 +340,8 @@ static void release_stripe(struct stripe_head *sh)
unsigned long flags;
bool wakeup;
if (test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state))
if (unlikely(!conf->mddev->thread) ||
test_and_set_bit(STRIPE_ON_RELEASE_LIST, &sh->state))
goto slow_path;
wakeup = llist_add(&sh->release_list, &conf->released_stripes);
if (wakeup)