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@xxxxxxxxxxx>
---
--- 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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