3.18-stable review patch. If anyone has any objections, please let me know.
------------------
[ Upstream commit 2a708cff93f1845b9239bc7d6310aef54e716c6a ]
__dm_destroy() takes io_barrier SRCU lock (dm_get_live_table) and
suspend_lock in reverse order. Doing so can cause AB-BA deadlock:
__dm_destroy dm_swap_table
---------------------------------------------------
mutex_lock(suspend_lock)
dm_get_live_table()
srcu_read_lock(io_barrier)
dm_sync_table()
synchronize_srcu(io_barrier)
.. waiting for dm_put_live_table()
mutex_lock(suspend_lock)
.. waiting for suspend_lock
Fix this by taking the locks in proper order.
Signed-off-by: Jun'ichi Nomura <j-nom...@ce.jp.nec.com>
Fixes: ab7c7bb6f4ab ("dm: hold suspend_lock while suspending device during
device deletion")
Acked-by: Mikulas Patocka <mpato...@redhat.com>
Signed-off-by: Mike Snitzer <snit...@redhat.com>
Cc: sta...@vger.kernel.org
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
drivers/md/dm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 1d08dc6fa0b5..00c86ff3c721 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2599,14 +2599,14 @@ static void __dm_destroy(struct mapped_device *md, bool
wait)
* do not race with internal suspend.
*/
mutex_lock(&md->suspend_lock);
+ map = dm_get_live_table(md, &srcu_idx);
if (!dm_suspended_md(md)) {
dm_table_presuspend_targets(map);
dm_table_postsuspend_targets(map);
}
- mutex_unlock(&md->suspend_lock);
-
/* dm_put_live_table must be before msleep, otherwise deadlock is
possible */
dm_put_live_table(md, srcu_idx);
+ mutex_unlock(&md->suspend_lock);
/*
* Rare, but there may be I/O requests still going to complete,
--
2.17.1
