linux-kernel - Re: [stable] apparent regression (crash)

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Message-ID: <4DE888BB.8000008@msgid.corpit.ru>
Date:	Fri, 03 Jun 2011 11:09:47 +0400
From:	lists+linux-kernel@...pit.ru
To:	Atsushi Nemoto <anemo@....ocn.ne.jp>
CC:	James.Bottomley@...senPartnership.com,
	Jens Axboe <axboe@...nel.dk>, greg@...ah.com, jslaby@...e.cz,
	stable@...nel.org, jejb@...isc-linux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [stable] apparent regression (crash) - 2.6.38.6

03.06.2011 11:01, Michael Tokarev wrote:
> commit 2e8532e0a9ee1d25b279ac78ee8ce31701e2aa15
> Author: Michael Tokarev <mjt@....msk.ru>
> Date:   Fri Jun 3 10:50:49 2011 +0400
> 
>     block: add proper state guards to elv_queue_empty()
> 
>     Like in 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae (backported to
>     stable 2.6.38 as 0a58e077eb600d1efd7e54ad9926a75a39d7f8ae) which
>     fixes this for __elv_next_request(), as reported by Atsushi Nemoto,
>     elv_queue_empty() also needs to check for dead queue condition
>     before touchin elevator.
> 
>     elv_queue_empty() has been removed upstream so this is only applicable
>     for versions prior to 2.6.39, including 2.6.32-longterm.

Um, i'm not sure about this one -- 2.6.32 does not have
other pieces of this puzzle (and 2.6.38.8 was the last
in the 2.6.38.y series).

/mjt

>     Signed-Off-By: Michael Tokarev <mjt@....msk.ru>
> 
> diff --git a/block/elevator.c b/block/elevator.c
> index 236e93c..30cec25 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -727,7 +727,8 @@ int elv_queue_empty(struct request_queue *q)
>  	if (!list_empty(&q->queue_head))
>  		return 0;
> 
> -	if (e->ops->elevator_queue_empty_fn)
> +	if (!test_bit(QUEUE_FLAG_DEAD, &q->queue_flags) &&
> +	    e->ops->elevator_queue_empty_fn)
>  		return e->ops->elevator_queue_empty_fn(q);
> 
>  	return 1;
--
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