[PATCH 3.12 65/65] dm thin: fix race condition when destroying thin pool workqueue

[Jiri Slaby <jslaby@suse.cz>]

From: Nikolay Borisov <kernel@kyup.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 18d03e8c25f173f4107a40d0b8c24defb6ed69f3 upstream.

When a thin pool is being destroyed delayed work items are
cancelled using cancel_delayed_work(), which doesn't guarantee that on
return the delayed item isn't running.  This can cause the work item to
requeue itself on an already destroyed workqueue.  Fix this by using
cancel_delayed_work_sync() which guarantees that on return the work item
is not running anymore.

Fixes: 905e51b39a555 ("dm thin: commit outstanding data every second")
Fixes: 85ad643b7e7e5 ("dm thin: add timeout to stop out-of-data-space mode holding IO forever")
Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: Nikolay Borisov <kernel@kyup.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/md/dm-thin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 5ff934102f30..d14d1c1fff8b 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2331,7 +2331,7 @@ static void pool_postsuspend(struct dm_target *ti)
 	struct pool_c *pt = ti->private;
 	struct pool *pool = pt->pool;
 
-	cancel_delayed_work(&pool->waker);
+	cancel_delayed_work_sync(&pool->waker);
 	flush_workqueue(pool->wq);
 	(void) commit(pool);
 }
-- 
2.7.1