linux-kernel - Re: [PATCH v2 2/2] elevator: acquire q->sysfs_lock in elevator

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Message-ID: <20130922170005.GE30946@htj.dyndns.org>
Date:	Sun, 22 Sep 2013 13:00:05 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Tomoki Sekiyama <tomoki.sekiyama@....com>
Cc:	linux-kernel@...r.kernel.org, axboe@...nel.dk,
	seiji.aguchi@....com, vgoyal@...hat.com, majianpeng@...il.com
Subject: Re: [PATCH v2 2/2] elevator: acquire q->sysfs_lock in
 elevator_change()

On Fri, Aug 30, 2013 at 06:47:16PM -0400, Tomoki Sekiyama wrote:
> Add locking of q->sysfs_lock into elevator_change() (an exported function)
> to ensure it is held to protect q->elevator from elevator_init(), even if
> elevator_change() is called from non-sysfs paths.
> sysfs path (elv_iosched_store) uses __elevator_change(), non-locking
> version, as the lock is already taken by elv_iosched_store().
> 
> Signed-off-by: Tomoki Sekiyama <tomoki.sekiyama@....com>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun
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