Patch allows v4l2_open and v4l2_release functions return 0 if open and
release driver callbacks set to NULL. This will be used in radio
drivers.
--
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
static int v4l2_open(struct inode *inode, struct file *filp)
{
struct video_device *vdev;
static int v4l2_open(struct inode *inode, struct file *filp)
{
struct video_device *vdev;
/* Check if the video device is available */
mutex_lock(&videodev_lock);
/* Check if the video device is available */
mutex_lock(&videodev_lock);
/* and increase the device refcount */
video_get(vdev);
mutex_unlock(&videodev_lock);
/* and increase the device refcount */
video_get(vdev);
mutex_unlock(&videodev_lock);
- ret = vdev->fops->open(filp);
+ if (vdev->fops->open)
+ ret = vdev->fops->open(filp);
+
/* decrease the refcount in case of an error */
if (ret)
video_put(vdev);
/* decrease the refcount in case of an error */
if (ret)
video_put(vdev);
static int v4l2_release(struct inode *inode, struct file *filp)
{
struct video_device *vdev = video_devdata(filp);
static int v4l2_release(struct inode *inode, struct file *filp)
{
struct video_device *vdev = video_devdata(filp);
- int ret = vdev->fops->release(filp);
+ int ret = 0;
+
+ if (vdev->fops->release)
+ vdev->fops->release(filp);
/* decrease the refcount unconditionally since the release()
return value is ignored. */
/* decrease the refcount unconditionally since the release()
return value is ignored. */