linux-kernel - [PATCH 11/16] drivers/media/video: Use available error codes

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Message-ID: <Pine.LNX.4.64.1008161827310.19313@ask.diku.dk>
Date:	Mon, 16 Aug 2010 18:27:47 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Antoine Jacquet <royale@...ezo.com>,
	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-usb@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 11/16] drivers/media/video: Use available error codes

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

Error codes are stored in rc, but the return value is always 0.  Return rc
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 of the function, but currently its return value
is ignored.  Alternatively, the function could be converted to return
nothing.

 drivers/media/video/zr364xx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/video/zr364xx.c b/drivers/media/video/zr364xx.c
index a82b5bd..616c61f 100644
--- a/drivers/media/video/zr364xx.c
+++ b/drivers/media/video/zr364xx.c
@@ -572,7 +572,7 @@ static int zr364xx_got_frame(struct zr364xx_camera *cam, int jpgsize)
 	DBG("wakeup [buf/i] [%p/%d]\n", buf, buf->vb.i);
 unlock:
 	spin_unlock_irqrestore(&cam->slock, flags);
-	return 0;
+	return rc;
 }
 
 /* this function moves the usb stream read pipe data
--
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