[1/2] v4l2-dev.c: return 0 for NULL open and release callbacks
Commit Message
Hello, all
This is two patches that removes empty open and release functions in
pci/isa radio drivers. To handle that we change v4l2-dev.c file.
I'm not sure, but it's probably that small note about it should be added
in docs. If i did something wrong, please correct.
---
From: Hans Verkuil <hverkuil@xs4all.nl>
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.
Priority: normal
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Alexey Klimov <klimov.linux@gmail.com>
--
@@ -267,7 +267,7 @@
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);
@@ -281,7 +281,9 @@
/* 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);
@@ -292,7 +294,10 @@
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. */