diff options
Diffstat (limited to 'drivers/media/video/w9966.c')
| -rw-r--r-- | drivers/media/video/w9966.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/media/video/w9966.c b/drivers/media/video/w9966.c index 2ff00bc5ad6..c635cffb1fb 100644 --- a/drivers/media/video/w9966.c +++ b/drivers/media/video/w9966.c @@ -113,6 +113,7 @@ struct w9966_dev { signed char contrast; signed char color; signed char hue; + unsigned long in_use; }; /* @@ -184,10 +185,27 @@ static int w9966_v4l_ioctl(struct inode *inode, struct file *file, static ssize_t w9966_v4l_read(struct file *file, char __user *buf, size_t count, loff_t *ppos); +static int w9966_exclusive_open(struct inode *inode, struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct w9966_dev *cam = vdev->priv; + + return test_and_set_bit(0, &cam->in_use) ? -EBUSY : 0; +} + +static int w9966_exclusive_release(struct inode *inode, struct file *file) +{ + struct video_device *vdev = video_devdata(file); + struct w9966_dev *cam = vdev->priv; + + clear_bit(0, &cam->in_use); + return 0; +} + static const struct file_operations w9966_fops = { .owner = THIS_MODULE, - .open = video_exclusive_open, - .release = video_exclusive_release, + .open = w9966_exclusive_open, + .release = w9966_exclusive_release, .ioctl = w9966_v4l_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = v4l_compat_ioctl32, |