From ab7c7bb6f4ab95dbca96fcfc4463cd69843e3e24 Mon Sep 17 00:00:00 2001
From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 27 Feb 2015 14:04:27 -0500
Subject: [PATCH] dm: hold suspend_lock while suspending device during device
deletion
__dm_destroy() must take the suspend_lock so that its presuspend and
postsuspend calls do not race with an internal suspend.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
---
drivers/md/dm.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 73f28802dc7a..e79d5ccfda64 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2638,10 +2638,16 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
if (dm_request_based(md))
flush_kthread_worker(&md->kworker);
+ /*
+ * Take suspend_lock so that presuspend and postsuspend methods
+ * do not race with internal suspend.
+ */
+ mutex_lock(&md->suspend_lock);
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);
--
2.34.1