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

drivers/md/raid5.c

···
 		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;
 }