From ed518b0f12ebcaed430a8d60da4ff0b09269bd10 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Sun, 29 Mar 2009 23:19:38 +0000 Subject: 2-dev.c: return 0 for NULL open and release callbacks From: Hans Verkuil 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 Signed-off-by: Alexey Klimov Signed-off-by: Mauro Carvalho Chehab --- linux/drivers/media/video/v4l2-dev.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'linux') diff --git a/linux/drivers/media/video/v4l2-dev.c b/linux/drivers/media/video/v4l2-dev.c index 2c4d38979..f7e128729 100644 --- a/linux/drivers/media/video/v4l2-dev.c +++ b/linux/drivers/media/video/v4l2-dev.c @@ -267,7 +267,7 @@ 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); @@ -281,7 +281,9 @@ 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); @@ -292,7 +294,10 @@ 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. */ -- cgit v1.2.3