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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
This commit is contained in:
Mikulas Patocka 2015-02-27 14:04:27 -05:00 committed by Mike Snitzer
parent 5f027a3bf1
commit ab7c7bb6f4
1 changed files with 6 additions and 0 deletions
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6
drivers/md/dm.c
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@ -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);