From a5567932fc926739e29e98487128080f40c61710 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 29 Mar 2012 20:57:08 +0200
Subject: blkcg: change a spin_lock() to spin_lock_irq()

Smatch complains that we re-enable IRQs twice.  It looks like we forgot
to disable them here on the spin_trylock() failure path.  This was added
in 9f13ef678e "blkcg: use double locking instead of RCU for blkg
synchronization".

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>`
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index a74019b..aa54c41 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1601,7 +1601,7 @@ static int blkiocg_pre_destroy(struct cgroup_subsys *subsys,
 		} else {
 			spin_unlock_irq(&blkcg->lock);
 			cpu_relax();
-			spin_lock(&blkcg->lock);
+			spin_lock_irq(&blkcg->lock);
 		}
 	}
 
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