linux-kernel - Re: [PATCH] virtio_blk: fix race between start and stop queue

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Message-ID: <20140516145450.GA5939@infradead.org>
Date:	Fri, 16 May 2014 07:54:50 -0700
From:	Christoph Hellwig <hch@...radead.org>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Ming Lei <tom.leiming@...il.com>, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH] virtio_blk: fix race between start and stop queue

On Fri, May 16, 2014 at 08:53:22AM -0600, Jens Axboe wrote:
> >This patch fixes the problem by starting/stopping blk-mq
> >with holding vq_lock.
> 
> Why not just use blk_mq_start_hw_queues()?

That would kick off a work item on every I/O completion, something
you didn't particularly like in scsi-mq :)

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