struct video_picture picture;
int height;
int width;
+ unsigned long in_use;
struct mutex lock;
};
return len;
}
+static int pms_exclusive_open(struct inode *inode, struct file *file)
+{
+ struct video_device *v = video_devdata(file);
+ struct pms_device *pd = (struct pms_device *)v;
+
+ return test_and_set_bit(0, &pd->in_use) ? -EBUSY : 0;
+}
+
+static int pms_exclusive_release(struct inode *inode, struct file *file)
+{
+ struct video_device *v = video_devdata(file);
+ struct pms_device *pd = (struct pms_device *)v;
+
+ clear_bit(0, &pd->in_use);
+ return 0;
+}
+
static const struct file_operations pms_fops = {
.owner = THIS_MODULE,
- .open = video_exclusive_open,
- .release = video_exclusive_release,
+ .open = pms_exclusive_open,
+ .release = pms_exclusive_release,
.ioctl = pms_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = v4l_compat_ioctl32,
{
.name = "Mediavision PMS",
.fops = &pms_fops,
+ .release = video_device_release_empty,
};
static struct pms_device pms_device;