diff options
Diffstat (limited to 'linux/drivers/media/video/uvc/uvc_v4l2.c')
| -rw-r--r-- | linux/drivers/media/video/uvc/uvc_v4l2.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/linux/drivers/media/video/uvc/uvc_v4l2.c b/linux/drivers/media/video/uvc/uvc_v4l2.c index bc13dbf05..160c01314 100644 --- a/linux/drivers/media/video/uvc/uvc_v4l2.c +++ b/linux/drivers/media/video/uvc/uvc_v4l2.c @@ -443,6 +443,17 @@ static int uvc_v4l2_open(struct file *file) goto done; } + if (atomic_inc_return(&video->dev->users) == 1) { + if ((ret = uvc_status_start(video->dev)) < 0) { +#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) + usb_autopm_put_interface(video->dev->intf); +#endif + atomic_dec(&video->dev->users); + kfree(handle); + goto done; + } + } + handle->device = video; handle->state = UVC_HANDLE_PASSIVE; file->private_data = handle; @@ -477,6 +488,9 @@ static int uvc_v4l2_release(struct file *file) kfree(handle); file->private_data = NULL; + if (atomic_dec_return(&video->dev->users) == 0) + uvc_status_stop(video->dev); + #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 19) usb_autopm_put_interface(video->dev->intf); #endif |