linux-kernel - Re: [Linux-fbdev-devel] [PATCH 6/7] drivers/video: Release mutex in error handling code

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Message-Id: <20080722061914.301275a8.krzysztof.h1@poczta.fm>
Date:	Tue, 22 Jul 2008 06:19:14 +0200
From:	Krzysztof Helt <krzysztof.h1@...zta.fm>
To:	Julia Lawall <julia@...u.dk>
Cc:	adaplas@...il.com, linux-fbdev-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [Linux-fbdev-devel] [PATCH 6/7] drivers/video: Release mutex in
 error handling code

On Mon, 21 Jul 2008 09:58:55 +0200 (CEST)
Julia Lawall <julia@...u.dk> wrote:

> From: Julia Lawall <julia@...u.dk>
> 
> The mutex is released on a successful return, so it would seem that it
> should be released on an error return as well.
> 
> The semantic patch finds this problem is as follows:
> (http://www.emn.fr/x-info/coccinelle/)
> 
> // <smpl>
> @@
> expression l;
> @@
> 
> mutex_lock(l);
> ... when != mutex_unlock(l)
>     when any
>     when strict
> (
> if (...) { ... when != mutex_unlock(l)
> +   mutex_unlock(l);
>     return ...;
> }
> |
> mutex_unlock(l);
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---

Acked-by: Krzysztof Helt <krzysztof.h1@...pl>

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