[patch 33/46] dm raid1: flush workqueue before destruction

[Greg KH]

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Mikulas Patocka <mpatocka@xxxxxxxxxx>

commit 18776c7316545482a02bfaa2629a2aa1afc48357 upstream.

We queue work on keventd queue --- so this queue must be flushed in the
destructor. Otherwise, keventd could access mirror_set after it was freed.

Signed-off-by: Mikulas Patocka <mpatocka@xxxxxxxxxx>
Signed-off-by: Alasdair G Kergon <agk@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 drivers/md/dm-raid1.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/md/dm-raid1.c
+++ b/drivers/md/dm-raid1.c
@@ -1598,6 +1598,7 @@ static void mirror_dtr(struct dm_target 
 
 	del_timer_sync(&ms->timer);
 	flush_workqueue(ms->kmirrord_wq);
+	flush_scheduled_work();
 	dm_kcopyd_client_destroy(ms->kcopyd_client);
 	destroy_workqueue(ms->kmirrord_wq);
 	free_context(ms, ti, ms->nr_mirrors);

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