V4L/DVB (12725): v4l: warn when desired devnodenr is in use & add _no_warn function

Warn when the desired device node number is already in use, except when
the new video_register_device_no_warn function is called since in some
use-cases that warning is not relevant.

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

1 files changed, 4 insertions, 0 deletions

diff --git a/include/media/v4l2-dev.h b/include/media/v4l2-dev.h
index 255f6442b63..73c9867d744 100644
--- a/include/media/v4l2-dev.h
+++ b/include/media/v4l2-dev.h
@@ -101,6 +101,10 @@ struct video_device
    Also note that vdev->minor is set to -1 if the registration failed. */
 int __must_check video_register_device(struct video_device *vdev, int type, int nr);
 
+/* Same as video_register_device, but no warning is issued if the desired
+   device node number was already in use. */
+int __must_check video_register_device_no_warn(struct video_device *vdev, int type, int nr);
+
 /* Unregister video devices. Will do nothing if vdev == NULL or
    vdev->minor < 0. */
 void video_unregister_device(struct video_device *vdev);