This looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>

On Tue, Oct 18, 2016 at 02:51:33PM -0700, Bart Van Assche wrote:

 static void dm_mq_start_queue(struct request_queue *q)
 {
-	unsigned long flags;
-
-	spin_lock_irqsave(q->queue_lock, flags);
-	queue_flag_clear(QUEUE_FLAG_STOPPED, q);
-	spin_unlock_irqrestore(q->queue_lock, flags);
-
 	blk_mq_start_stopped_hw_queues(q, true);
 	blk_mq_kick_requeue_list(q);

FYI, I'm tempted to say we should always call blk_mq_kick_requeue_list
from blk_mq_start_stopped_hw_queues, but that's a separate issue.

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