V4L/DVB (9942): v4l2-dev: check for parent device in get_index.

get_index requires a valid parent device in order to discover which
indices are in use. Some drivers (e.g. pvrusb2) do not set the parent
device. In that case just return 0.

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/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 682f48aadcac..c5ca51a9020a 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -162,6 +162,10 @@ static int get_index(struct video_device *vdev, int num)
                 return -EINVAL;
         }
 
+        /* Some drivers do not set the parent. In that case always return 0. */
+        if (vdev->parent == NULL)
+                return 0;
+
         for (i = 0; i < VIDEO_NUM_DEVICES; i++) {
                 if (video_device[i] != NULL &&
                     video_device[i] != vdev &&