linux-kernel - Re: [ 84/95] virtio_blk: fix config handler race

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Date:	Mon, 10 Sep 2012 10:45:07 +0800
From:	Asias He <asias@...hat.com>
To:	Rusty Russell <rusty@...tcorp.com.au>
CC:	Ben Hutchings <ben@...adent.org.uk>, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Michael S. Tsirkin" <mst@...hat.com>
Subject: Re: [ 84/95] virtio_blk: fix config handler race

On 09/10/2012 10:26 AM, Rusty Russell wrote:
> Ben Hutchings <ben@...adent.org.uk> writes:
> 
>> 3.2-stable review patch.  If anyone has any objections, please let me know.
>>
>> ------------------
>>
>> From: "Michael S. Tsirkin" <mst@...hat.com>
>>
>> commit 4678d6f970c2f7c0cbfefc0cc666432d153b321b upstream.
>>
>> Fix a theoretical race related to config work
> 
> ???
> 
> From Documentation/stable_kernel_rules.txt:
> 
>  - No "theoretical race condition" issues, unless an explanation of how the
>    race can be exploited is also provided.
> 
> Similarly, '[ 85/95] virtio_blk: Drop unused request tracking list'
> is a marginal perf improvement, why is it in there?

This also drops the following line which may trigger a BUG in hot
-unplug path.

       /* Nothing should be pending. */
       BUG_ON(!list_empty(&vblk->reqs));

So, this patch is needed to fix up the hot-unplug bug along with the others.

> 
> Neither of these were cc:stable; did someone request them specifically?
> 
> Confused,
> Rusty.
> 


-- 
Asias
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