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[3.13.y-ckt,020/136] dm thin: fix race condition when destroying thin pool workqueue

Message ID 1454436931-22481-21-git-send-email-kamal@canonical.com
State New
Headers show

Commit Message

Kamal Mostafa Feb. 2, 2016, 6:13 p.m. UTC 
3.13.11-ckt34 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Nikolay Borisov <kernel@kyup.com>

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>
[ kamal: backport to 3.13-stable: no pool->no_space_timeout ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 drivers/md/dm-thin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/md/dm-thin.c b/drivers/md/dm-thin.c
index 5b155b3f..c9c9d59 100644
--- a/drivers/md/dm-thin.c
+++ b/drivers/md/dm-thin.c
@@ -2320,7 +2320,7 @@  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);
 }