linux-kernel - [PATCH 4/16] drivers/media/video/zoran: Use available error codes

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Message-ID: <Pine.LNX.4.64.1008161825220.19313@ask.diku.dk>
Date:	Mon, 16 Aug 2010 18:25:39 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	mjpeg-users@...ts.sourceforge.net, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 4/16] drivers/media/video/zoran: Use available error codes

From: Julia Lawall <julia@...u.dk>

Error codes are stored in res, but the return value is always 0.  Return
res instead.

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

// <smpl>
@r@
local idexpression x;
constant C;
@@

if (...) { ...
  x = -C
  ... when != x
(
  return <+...x...+>;
|
  return NULL;
|
  return;
|
* return ...;
)
}
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
This changes the semantics and has not been tested.

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

diff --git a/drivers/media/video/zoran/zoran_driver.c b/drivers/media/video/zoran/zoran_driver.c
index 6f89d0a..c155ddf 100644
--- a/drivers/media/video/zoran/zoran_driver.c
+++ b/drivers/media/video/zoran/zoran_driver.c
@@ -3322,7 +3322,7 @@ zoran_mmap (struct file           *file,
 mmap_unlock_and_return:
 	mutex_unlock(&zr->resource_lock);
 
-	return 0;
+	return res;
 }
 
 static const struct v4l2_ioctl_ops zoran_ioctl_ops = {
--
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