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

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Message-ID: <53CCD08C.80702@kernel.dk>
Date:	Mon, 21 Jul 2014 10:34:20 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Alexander Gordeev <agordeev@...hat.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] blk-mq: bitmap tag: fix potential unwakeable sleep in
 bt_get()

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.


-- 
Jens Axboe

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