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authorNikolay Borisov <kernel@kyup.com>2015-12-17 19:03:35 +0300
committerMike Snitzer <snitzer@redhat.com>2015-12-17 23:47:20 +0300
commit18d03e8c25f173f4107a40d0b8c24defb6ed69f3 (patch)
tree6cdaea8c63311344d76035ec82320fd337c71d6f /drivers/md/dm-thin.c
parent512167788a6fe9481a33a3cce5f80b684631a1bb (diff)
downloadlinux-18d03e8c25f173f4107a40d0b8c24defb6ed69f3.tar.xz
dm thin: fix race condition when destroying thin pool workqueue
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: stable@vger.kernel.org
Diffstat (limited to 'drivers/md/dm-thin.c')
-rw-r--r--drivers/md/dm-thin.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 63903a5a5d9e..a1cc797fe88f 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -3453,8 +3453,8 @@ 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(&pool->no_space_timeout);
+ cancel_delayed_work_sync(&pool->waker);
+ cancel_delayed_work_sync(&pool->no_space_timeout);
flush_workqueue(pool->wq);
(void) commit(pool);
}