[media] v4l2: use new flag to enable core priority handling

Rather than guess which driver supports core priority handling, require drivers
that do to explicitly set the V4L2_FL_USE_FH_PRIO flag in video_device.

Updated the core prio handling accordingly and set the flag in the three
drivers that do.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 1898099ec65a..498e6742579e 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -578,11 +578,9 @@ int __video_register_device(struct video_device *vdev, int type, int nr,
                         vdev->parent = vdev->v4l2_dev->dev;
                 if (vdev->ctrl_handler == NULL)
                         vdev->ctrl_handler = vdev->v4l2_dev->ctrl_handler;
-                /* If the prio state pointer is NULL, and if the driver doesn't
-                   handle priorities itself, then use the v4l2_device prio
-                   state. */
-                if (vdev->prio == NULL && vdev->ioctl_ops &&
-                                vdev->ioctl_ops->vidioc_s_priority == NULL)
+                /* If the prio state pointer is NULL, then use the v4l2_device
+                   prio state. */
+                if (vdev->prio == NULL)
                         vdev->prio = &vdev->v4l2_dev->prio;
         }