linux-kernel - Re: [PATCH block/for-next] block: don't call blk_drain

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Date:	Fri, 4 Nov 2011 07:38:11 -0700
From:	Tejun Heo <tj@...nel.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Jens Axboe <axboe@...nel.dk>, Jiri Slaby <jslaby@...e.cz>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Jiri Slaby <jirislaby@...il.com>
Subject: Re: [PATCH block/for-next] block: don't call blk_drain_queue() if
 elevator is not up

Hello,

On Fri, Nov 4, 2011 at 2:40 AM, Stefan Richter
<stefanr@...6.in-berlin.de> wrote:
>>       /* @q won't process any more request, flush async actions */
>>       del_timer_sync(&q->backing_dev_info.laptop_mode_wb_timer);
>
> What prevents elevator_attach to be called and requests to be inserted
> between 'if (q-elevator)' and 'blk_put_queue(q)'?

The fact that the queue owner has called blk_cleaup_queue()?

Thanks.

-- 
tejun
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