linux-kernel - Re: [PATCH] blk-mq: auto-start hw queue in requeue

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Message-ID: <20140919174806.GA19983@lst.de>
Date:	Fri, 19 Sep 2014 19:48:06 +0200
From:	Christoph Hellwig <hch@....de>
To:	Ming Lei <ming.lei@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] blk-mq: auto-start hw queue in requeue

On Fri, Sep 19, 2014 at 10:22:50PM +0800, Ming Lei wrote:
> Requests often need to be retried because of timeout, hardware
> busy or sort of reasons via blk_mq_requeue_request(), but at
> that time dispatch queue may have been stopped.
> 
> This patch starts the dispatch queue automatically in requeue's
> work handler, and fixes scsi-mq's timeout issue, which can be
> triggered if there are two or more requests timedout.

Sounds like blk_mq_requeue_work should simply call void
blk_mq_start_hw_queues where it calls blk_mq_run_queues currently.

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