Le mardi 07 novembre 2023 à 21:05 +0100, Paul Kocialkowski a écrit :
> The cropcap and g/s_crop ioctls are automatically marked as valid whenever the
> g/s_selection ops are filled. The rationale is to auto-enable these legacy
> cropcap and g/s_crop ioctls that rely on g/s_selection.
>
> However it's possible that the ops are filled but explicitly disabled with
> calls to v4l2_disable_ioctl. In this situation the legacy ioctls should not
> be enabled.
>
> Add a check on the video device's valid ioctls field before auto-selecting
> them to honor the driver's choice. Note that the meaning of the bitfield
> stored in the video device is the opposite of what the name suggests as
> v4l2_disable_ioctl will set the bits. Their meaning will be reversed at
> the end of the function.
>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@xxxxxxxxxxx>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>
> ---
> drivers/media/v4l2-core/v4l2-dev.c | 6 ++++--
> 1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-dev.c b/drivers/media/v4l2-core/v4l2-dev.c
> index f81279492682..d13954bd31fd 100644
> --- a/drivers/media/v4l2-core/v4l2-dev.c
> +++ b/drivers/media/v4l2-core/v4l2-dev.c
> @@ -642,11 +642,13 @@ static void determine_valid_ioctls(struct video_device *vdev)
> SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
> SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
> SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
> - if (ops->vidioc_g_selection) {
> + if (ops->vidioc_g_selection &&
> + !test_bit(_IOC_NR(VIDIOC_G_SELECTION), vdev->valid_ioctls)) {
> __set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
> __set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
> }
> - if (ops->vidioc_s_selection)
> + if (ops->vidioc_s_selection &&
> + !test_bit(_IOC_NR(VIDIOC_S_SELECTION), vdev->valid_ioctls))
> __set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
> SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
> SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
