linux-kernel - Re: [PATCH] blk-throttle: check stats

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Message-ID: <54E4DEDF.1010102@kernel.dk>
Date:	Wed, 18 Feb 2015 10:50:07 -0800
From:	Jens Axboe <axboe@...nel.dk>
To:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
CC:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] blk-throttle: check stats_cpu before reading it from
 sysfs

On 02/16/2015 11:16 AM, Thadeu Lima de Souza Cascardo wrote:
> When reading blkio.throttle.io_serviced in a recently created blkio
> cgroup, it's possible to race against the creation of a throttle policy,
> which delays the allocation of stats_cpu.
>
> Like other functions in the throttle code, just checking for a NULL
> stats_cpu prevents the following oops caused by that race.

Applied for this series, thanks.

-- 
Jens Axboe

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