[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, 1 insertions, 0 deletions

diff --git a/drivers/media/video/vivi.c b/drivers/media/video/vivi.c
index 42500bf03a9c..2238a613d664 100644
--- a/drivers/media/video/vivi.c
+++ b/drivers/media/video/vivi.c
@@ -1254,6 +1254,7 @@ static int __init vivi_create_instance(int inst)
         *vfd = vivi_template;
         vfd->debug = debug;
         vfd->v4l2_dev = &dev->v4l2_dev;
+        set_bit(V4L2_FL_USE_FH_PRIO, &vfd->flags);
 
         /*
          * Provide a mutex to v4l2 core. It will be used to protect