linux-kernel - [PATCH 3/5] drivers/media/video/gspca/cpia1.c: introduce missing initialization

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Date:	Sat, 18 Aug 2012 23:25:57 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	kernel-janitors@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 3/5] drivers/media/video/gspca/cpia1.c: introduce missing initialization

From: Julia Lawall <Julia.Lawall@...6.fr>

The result of one call to a function is tested, and then at the second call
to the same function, the previous result, and not the current result, is
tested again.

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

// <smpl>
@@
expression ret;
identifier f;
statement S1,S2;
@@

*ret = f(...);
if (\(ret != 0\|ret < 0\|ret == NULL\)) S1
... when any
*f(...);
if (\(ret != 0\|ret < 0\|ret == NULL\)) S2
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/media/video/gspca/cpia1.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/video/gspca/cpia1.c b/drivers/media/video/gspca/cpia1.c
index 2499a88..b3ba47d 100644
--- a/drivers/media/video/gspca/cpia1.c
+++ b/drivers/media/video/gspca/cpia1.c
@@ -751,7 +751,7 @@ static int goto_high_power(struct gspca_dev *gspca_dev)
 	if (signal_pending(current))
 		return -EINTR;
 
-	do_command(gspca_dev, CPIA_COMMAND_GetCameraStatus, 0, 0, 0, 0);
+	ret = do_command(gspca_dev, CPIA_COMMAND_GetCameraStatus, 0, 0, 0, 0);
 	if (ret)
 		return ret;
 

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