linux-kernel - Re: [PATCH] blk-mq: prevent unmapped hw queue from being scheduled

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Message-ID: <CACVXFVMULejnsWR+Deya9G1SS797HtoZqvSYgo0E+jWqrAzGmA@mail.gmail.com>
Date:	Tue, 9 Dec 2014 12:56:27 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Jens Axboe <axboe@...com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] blk-mq: prevent unmapped hw queue from being scheduled

On Tue, Dec 9, 2014 at 12:39 PM, Jens Axboe <axboe@...com> wrote:
> On 12/08/2014 05:41 PM, Ming Lei wrote:
>
>
> Picked up for 3.19, sorry for the delay. I'm curious how this queue gets

Thanks!

> scheduled, though. My worry here would be that we are masking a bug that
> should be fixed separately.

That is because the schedule unit of following interfaces is
per request_queue, and they are easily used in drivers now:

   blk_mq_start_hw_queues()
   blk_mq_start_stopped_hw_queues()
   blk_mq_kick_requeue_list().

Thanks,
Ming Lei
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