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

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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>
This commit is contained in:
Hans Verkuil 2008-12-19 09:10:56 -03:00 committed by Mauro Carvalho Chehab
parent cfbd307289
commit 806e5b7cfa
1 changed files with 4 additions and 0 deletions
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4
drivers/media/video/v4l2-dev.c
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@ -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 &&