linux-kernel - [PATCH 8/9] sound/soc/soc-core.c: Remove useless kfree

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Message-Id: <1347462407-13499-8-git-send-email-peter.senna@gmail.com>
Date:	Wed, 12 Sep 2012 17:06:46 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	Liam Girdwood <lrg@...com>
Cc:	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, linux-kernel@...r.kernel.org
Subject: [PATCH 8/9] sound/soc/soc-core.c: Remove useless kfree

From: Peter Senna Tschudin <peter.senna@...il.com>

Remove useless kfree() and clean up code related to the removal.

The semantic patch that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r exists@
position p1,p2;
expression x;
@@

if (x@p1 == NULL) { ... kfree@p2(x); ... return ...; }

@unchanged exists@
position r.p1,r.p2;
expression e <= r.x,x,e1;
iterator I;
statement S;
@@

if (x@p1 == NULL) { ... when != I(x,...) S
                        when != e = e1
                        when != e += e1
                        when != e -= e1
                        when != ++e
                        when != --e
                        when != e++
                        when != e--
                        when != &e
   kfree@p2(x); ... return ...; }

@ok depends on unchanged exists@
position any r.p1;
position r.p2;
expression x;
@@

... when != true x@p1 == NULL
kfree@p2(x);

@depends on !ok && unchanged@
position r.p2;
expression x;
@@

*kfree@p2(x);
// </smpl>

Signed-off-by: Peter Senna Tschudin <peter.senna@...il.com>

---
 sound/soc/soc-core.c |    2 --
 1 file changed, 2 deletions(-)

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index 2a4c7bb..6b29c73 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4052,8 +4052,6 @@ int snd_soc_register_codec(struct device *dev,
 	return 0;
 
 fail:
-	kfree(codec->reg_def_copy);
-	codec->reg_def_copy = NULL;
 	kfree(codec->name);
 	kfree(codec);
 	return ret;

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