linux-kernel - [PATCH] v4l2: modify return value of VIDIOC

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Date:	Wed, 29 Apr 2009 20:57:24 +0200
From:	Németh Márton <nm127@...email.hu>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] v4l2: modify return value of VIDIOC_REQBUFS ioctl

The V4L2 ioctls usually return 0 when the operation was successful
and -1 in case of error. Currently VIDIOC_REQBUFS returns the
number of buffers which is redundant because this information is
available in count field of struct v4l2_requestbuffers. The
V4L2 API specification, revision 0.24 [1] explicitly specifies for
VIDIOC_REQBUFS that the return value shall be 0 on success.

The patch was tested with v4l-test 0.13 [2] with vivi driver.

References:
[1] V4L2 API specification, revision 0.24
    http://v4l2spec.bytesex.org/spec/r13696.htm

[2] v4l-test: Test environment for Video For Linux Two API
    http://v4l-test.sourceforge.net/

Signed-off-by: Márton Németh <nm127@...email.hu>
---
--- linux-2.6.30-rc3/drivers/media/video/videobuf-core.c.orig	2009-04-22 05:07:00.000000000 +0200
+++ linux-2.6.30-rc3/drivers/media/video/videobuf-core.c	2009-04-29 18:30:15.000000000 +0200
@@ -439,6 +439,7 @@ int videobuf_reqbufs(struct videobuf_que
 	}

 	req->count = retval;
+	retval = 0;

  done:
 	mutex_unlock(&q->vb_lock);
--
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