From 4ae9944d132b160d444fa3aa875307eb0fa3eeec Mon Sep 17 00:00:00 2001
From: Junichi Nomura <j-nomura@ce.jp.nec.com>
Date: Tue, 26 May 2015 08:25:54 +0000
Subject: [PATCH] dm: run queue on re-queue
Without kicking queue, requeued request may stay forever in
the queue if there are no other I/O activities to the device.
The original error had been in v2.6.39 with commit 7eaceaccab5f
("block: remove per-queue plugging"), which replaced conditional
plugging by periodic runqueue.
Commit 9d1deb83d489 in v4.1-rc1 removed the periodic runqueue
and the problem started to manifest.
Fixes: 9d1deb83d489 ("dm: don't schedule delayed run of the queue if nothing to do")
Signed-off-by: Jun'ichi Nomura <j-nomura@ce.jp.nec.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index a930b72314ac..0bf79a0bad37 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1164,6 +1164,7 @@ static void old_requeue_request(struct request *rq)
spin_lock_irqsave(q->queue_lock, flags);
blk_requeue_request(q, rq);
+ blk_run_queue_async(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}
--
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