linux-kernel - Re: [PATCH] sound/soc/mxs/mxs-saif.c: add missing kfree

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Date:	Sun, 21 Aug 2011 13:29:30 +0200
From:	Wolfram Sang <w.sang@...gutronix.de>
To:	Julia Lawall <julia@...u.dk>
Cc:	Dong Aisheng-B29396 <B29396@...escale.com>,
	Liam Girdwood <lrg@...com>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sound/soc/mxs/mxs-saif.c: add missing kfree

On Sun, Aug 21, 2011 at 01:18:45PM +0200, Julia Lawall wrote:
> From: Julia Lawall <julia@...u.dk>
> 
> Move the test on pdev->id before the kzalloc to avoid requiring kfree when
> the test fails.  This fix was suggested by Wolfram Sang.
> 
> A simplified version of the semantic match that finds this problem is as
> follows: (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @@
> identifier x;
> expression E1!=0,E2,E3,E4;
> statement S;
> iterator I;
> @@
> 
> (
> if (...) { ... when != kfree(x)
>                when != x = E3
>                when != E3 = x
> *  return ...;
>  }
> ... when != x = E2
>     when != I(...,x,...) S
> if (...) { ... when != x = E4
>  kfree(x); ... return ...; }
> )
> // </smpl>
> 
> Signed-off-by: Julia Lawall <julia@...u.dk>

Reviewed-by: Wolfram Sang <w.sang@...gutronix.de>

-- 
Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |

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