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

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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>
This commit is contained in:
Hans Verkuil
2009-09-06 07:54:00 -03:00
committed by Mauro Carvalho Chehab
parent 5062cb70c8
commit 6b5270d212
5 changed files with 40 additions and 8 deletions
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20
drivers/media/video/v4l2-dev.c
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@@ -382,6 +382,8 @@ static int get_index(struct video_device *vdev)
* @type: type of device to register
* @nr: which device node number (0 == /dev/video0, 1 == /dev/video1, ...
* -1 == first free)
* @warn_if_nr_in_use: warn if the desired device node number
* was already in use and another number was chosen instead.
*
* The registration code assigns minor numbers and device node numbers
* based on the requested type and registers the new device node with
@@ -401,7 +403,8 @@ static int get_index(struct video_device *vdev)
*
* %VFL_TYPE_RADIO - A radio card
*/
int video_register_device(struct video_device *vdev, int type, int nr)
static int __video_register_device(struct video_device *vdev, int type, int nr,
int warn_if_nr_in_use)
{
int i = 0;
int ret;
@@ -547,6 +550,10 @@ int video_register_device(struct video_device *vdev, int type, int nr)
reference to the device goes away. */
vdev->dev.release = v4l2_device_release;
if (nr != -1 && nr != vdev->num && warn_if_nr_in_use)
printk(KERN_WARNING "%s: requested %s%d, got %s%d\n",
__func__, name_base, nr, name_base, vdev->num);
/* Part 5: Activate this minor. The char device can now be used. */
mutex_lock(&videodev_lock);
video_device[vdev->minor] = vdev;
@@ -563,8 +570,19 @@ cleanup:
vdev->minor = -1;
return ret;
}
int video_register_device(struct video_device *vdev, int type, int nr)
{
return __video_register_device(vdev, type, nr, 1);
}
EXPORT_SYMBOL(video_register_device);
int video_register_device_no_warn(struct video_device *vdev, int type, int nr)
{
return __video_register_device(vdev, type, nr, 0);
}
EXPORT_SYMBOL(video_register_device_no_warn);
/**
* video_unregister_device - unregister a video4linux device
* @vdev: the device to unregister