linux-kernel - Re: [PATCH] blk-mq: bitmap tag: fix potential unwakeable sleep in bt

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Date:	Mon, 21 Jul 2014 11:11:45 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-mq: bitmap tag: fix potential unwakeable sleep in
 bt_get()

On Mon, Jul 21, 2014 at 10:34:20AM +0200, Jens Axboe wrote:
> On 2014-07-21 10:32, Alexander Gordeev wrote:
> >On Mon, Jul 21, 2014 at 10:16:54AM +0200, Jens Axboe wrote:
> >>What is this patch against?
> >
> >v3.16-rc5
> 
> My bad, was looking at the wrong sources. What is the race? If the
> clear and wakeup come in after the prepare_to_wait() but before the
> io_schedule(), the io_schedule() will be a no-op and it wont
> actually sleep. Your commit message doesn't mention any particular
> details.

Let me examine the code.. It was few weeks ago and I can not
remember what was that. And the changelog does not help :)

> 
> -- 
> Jens Axboe
> 

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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