diff options
Diffstat (limited to 'drivers/media/video/arv.c')
| -rw-r--r-- | drivers/media/video/arv.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/media/video/arv.c b/drivers/media/video/arv.c index 9e436ad3d34b..0d4f9b683459 100644 --- a/drivers/media/video/arv.c +++ b/drivers/media/video/arv.c @@ -116,6 +116,7 @@ struct ar_device { int width, height; int frame_bytes, line_bytes; wait_queue_head_t wait; + unsigned long in_use; struct mutex lock; }; @@ -742,10 +743,23 @@ void ar_release(struct video_device *vfd) * Video4Linux Module functions * ****************************************************************************/ +static struct ar_device ardev; + +static int ar_exclusive_open(struct inode *inode, struct file *file) +{ + return test_and_set_bit(0, &ardev.in_use) ? -EBUSY : 0; +} + +static int ar_exclusive_release(struct inode *inode, struct file *file) +{ + clear_bit(0, &ardev.in_use); + return 0; +} + static const struct file_operations ar_fops = { .owner = THIS_MODULE, - .open = video_exclusive_open, - .release = video_exclusive_release, + .open = ar_exclusive_open, + .release = ar_exclusive_release, .read = ar_read, .ioctl = ar_ioctl, #ifdef CONFIG_COMPAT @@ -762,7 +776,6 @@ static struct video_device ar_template = { }; #define ALIGN4(x) ((((int)(x)) & 0x3) == 0) -static struct ar_device ardev; static int __init ar_init(void) { |