/* Called when the last user of the video device exits. */
static void v4l2_device_release(struct device *cd)
{
struct video_device *vdev = to_video_device(cd);
struct v4l2_device *v4l2_dev = vdev->v4l2_dev;
mutex_lock(&videodev_lock);
if (WARN_ON(video_device[vdev->minor] != vdev)) {
/* should not happen */
mutex_unlock(&videodev_lock);
return;
}
/* Free up this device for reuse */
video_device[vdev->minor] = NULL;
/* Delete the cdev on this minor as well */
cdev_del(vdev->cdev);
/* Just in case some driver tries to access this from
the release() callback. */
vdev->cdev = NULL;
/* Mark device node number as free */
devnode_clear(vdev);
mutex_unlock(&videodev_lock);
#if defined(CONFIG_MEDIA_CONTROLLER)
if (v4l2_dev->mdev) {
/* Remove interfaces and interface links */
media_devnode_remove(vdev->intf_devnode);
if (vdev->entity.function != MEDIA_ENT_F_UNKNOWN)
media_device_unregister_entity(&vdev->entity);
}
#endif
/* Do not call v4l2_device_put if there is no release callback set.
* Drivers that have no v4l2_device release callback might free the
* v4l2_dev instance in the video_device release callback below, so we
* must perform this check here.
*
* TODO: In the long run all drivers that use v4l2_device should use the
* v4l2_device release callback. This check will then be unnecessary.
*/
if (v4l2_dev->release == NULL)
v4l2_dev = NULL;
/* Release video_device and perform other
cleanups as needed. */
vdev->release(vdev);
/* Decrease v4l2_device refcount */
if (v4l2_dev)
v4l2_device_put(v4l2_dev);
}
static void dvb_media_device_free(struct dvb_device *dvbdev)
{
#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
if (dvbdev->entity) {
media_device_unregister_entity(dvbdev->entity);
kfree(dvbdev->entity);
kfree(dvbdev->pads);
dvbdev->entity = NULL;
dvbdev->pads = NULL;
}
if (dvbdev->tsout_entity) {
int i;
for (i = 0; i < dvbdev->tsout_num_entities; i++) {
media_device_unregister_entity(&dvbdev->tsout_entity[i]);
kfree(dvbdev->tsout_entity[i].name);
}
kfree(dvbdev->tsout_entity);
kfree(dvbdev->tsout_pads);
dvbdev->tsout_entity = NULL;
dvbdev->tsout_pads = NULL;
dvbdev->tsout_num_entities = 0;
}
if (dvbdev->intf_devnode) {
media_devnode_remove(dvbdev->intf_devnode);
dvbdev->intf_devnode = NULL;
}
if (dvbdev->adapter->conn) {
media_device_unregister_entity(dvbdev->adapter->conn);
dvbdev->adapter->conn = NULL;
kfree(dvbdev->adapter->conn_pads);
dvbdev->adapter->conn_pads = NULL;
}
#endif
}