V4L/DVB (11390): 2-dev.c: return 0 for NULL open and release callbacks

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>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/media/video/v4l2-dev.c b/drivers/media/video/v4l2-dev.c
index 91228b3df07d..31eac66411d7 100644
--- a/drivers/media/video/v4l2-dev.c
+++ b/drivers/media/video/v4l2-dev.c
@@ -229,7 +229,7 @@ static int v4l2_mmap(struct file *filp, struct vm_area_struct *vm)
 static int v4l2_open(struct inode *inode, struct file *filp)
 {
         struct video_device *vdev;
-        int ret;
+        int ret = 0;
 
         /* Check if the video device is available */
         mutex_lock(&videodev_lock);
@@ -243,7 +243,9 @@ static int v4l2_open(struct inode *inode, struct file *filp)
         /* 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);
@@ -254,7 +256,10 @@ static int v4l2_open(struct inode *inode, struct file *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. */