linux-kernel - [PATCH v2 7/8] drivers/media/platform/davinci/vpbe.c: Removes useless kfree()

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Message-Id: <1347454564-5178-2-git-send-email-peter.senna@gmail.com>
Date:	Wed, 12 Sep 2012 14:55:58 +0200
From:	Peter Senna Tschudin <peter.senna@...il.com>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	kernel-janitors@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 7/8] drivers/media/platform/davinci/vpbe.c: Removes 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>

---
 drivers/media/platform/davinci/vpbe.c |    1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/media/platform/davinci/vpbe.c b/drivers/media/platform/davinci/vpbe.c
index c4a82a1..1125a87 100644
--- a/drivers/media/platform/davinci/vpbe.c
+++ b/drivers/media/platform/davinci/vpbe.c
@@ -771,7 +771,6 @@ static int vpbe_initialize(struct device *dev, struct vpbe_device *vpbe_dev)
 	return 0;
 
 vpbe_fail_amp_register:
-	kfree(vpbe_dev->amp);
 vpbe_fail_sd_register:
 	kfree(vpbe_dev->encoders);
 vpbe_fail_v4l2_device:

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