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media: v4l2-ioctl.c: readbuffers depends on V4L2_CAP_READWRITE 

commit cd9d9377ed235b294a492a094e1666178a5e78fd upstream.

If V4L2_CAP_READWRITE is not set, then readbuffers must be set to 0,
otherwise v4l2-compliance will complain.

A note on the Fixes tag below: this patch does not really fix that commit,
but it can be applied from that commit onwards. For older code there is no
guarantee that device_caps is set, so even though this patch would apply,
it will not work reliably.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Fixes: 049e684f2d (media: v4l2-dev: fix WARN_ON(!vdev->device_caps))
Cc: <stable@vger.kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans Verkuil 2021-11-03 12:28:31 +00:00 committed by Greg Kroah-Hartman
parent 9aaf99b4a8
commit 1bde269723
1 changed files with 3 additions and 1 deletions
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4
drivers/media/v4l2-core/v4l2-ioctl.c
View File

@ -2088,6 +2088,7 @@ static int v4l_prepare_buf(const struct v4l2_ioctl_ops *ops,
static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
struct file *file, void *fh, void *arg)
{
struct video_device *vfd = video_devdata(file);
struct v4l2_streamparm *p = arg;
v4l2_std_id std;
int ret = check_fmt(file, p->type);
@ -2099,7 +2100,8 @@ static int v4l_g_parm(const struct v4l2_ioctl_ops *ops,
if (p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
p->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
return -EINVAL;
p->parm.capture.readbuffers = 2;
if (vfd->device_caps & V4L2_CAP_READWRITE)
p->parm.capture.readbuffers = 2;
ret = ops->vidioc_g_std(file, fh, &std);
if (ret == 0)
v4l2_video_std_frame_period(std, &p->parm.capture.timeperframe);