Merge tag '3.15-fixes' of git://neil.brown.name/md

Pull md bugfix from Neil Brown:
 "One BUG fix for md for recent commit"

* tag '3.15-fixes' of git://neil.brown.name/md:
  raid5: fix a race of stripe count check

1 files changed, 1 insertions, 2 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 25247a852912..ad1b9bea446e 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -4370,8 +4370,7 @@ static struct stripe_head *__get_priority_stripe(struct r5conf *conf, int group)
                 sh->group = NULL;
         }
         list_del_init(&sh->lru);
-        atomic_inc(&sh->count);
-        BUG_ON(atomic_read(&sh->count) != 1);
+        BUG_ON(atomic_inc_return(&sh->count) != 1);
         return sh;
 }