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>
spin_lock_irqsave(q->queue_lock, flags);
blk_requeue_request(q, rq);
+ blk_run_queue_async(q);
spin_unlock_irqrestore(q->queue_lock, flags);
}