diff options
| -rw-r--r-- | drivers/media/video/uvc/uvc_driver.c | 1 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_status.c | 21 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_v4l2.c | 12 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvcvideo.h | 3 |
4 files changed, 34 insertions, 3 deletions
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c index f4fced3..3287454 100644 --- a/drivers/media/video/uvc/uvc_driver.c +++ b/drivers/media/video/uvc/uvc_driver.c @@ -1594,6 +1594,7 @@ static int uvc_probe(struct usb_interface *intf, INIT_LIST_HEAD(&dev->entities); INIT_LIST_HEAD(&dev->streaming); kref_init(&dev->kref); + atomic_set(&dev->users, 0); dev->udev = usb_get_dev(udev); dev->intf = usb_get_intf(intf); diff --git a/drivers/media/video/uvc/uvc_status.c b/drivers/media/video/uvc/uvc_status.c index 21d8712..f152a99 100644 --- a/drivers/media/video/uvc/uvc_status.c +++ b/drivers/media/video/uvc/uvc_status.c @@ -194,7 +194,7 @@ int uvc_status_init(struct uvc_device *dev) dev->status, UVC_MAX_STATUS_SIZE, uvc_status_complete, dev, interval); - return usb_submit_urb(dev->int_urb, GFP_KERNEL); + return 0; } void uvc_status_cleanup(struct uvc_device *dev) @@ -205,15 +205,30 @@ void uvc_status_cleanup(struct uvc_device *dev) uvc_input_cleanup(dev); } -int uvc_status_suspend(struct uvc_device *dev) +int uvc_status_start(struct uvc_device *dev) +{ + if (dev->int_urb == NULL) + return 0; + + return usb_submit_urb(dev->int_urb, GFP_KERNEL); +} + +void uvc_status_stop(struct uvc_device *dev) { usb_kill_urb(dev->int_urb); +} + +int uvc_status_suspend(struct uvc_device *dev) +{ + if (atomic_read(&dev->users)) + usb_kill_urb(dev->int_urb); + return 0; } int uvc_status_resume(struct uvc_device *dev) { - if (dev->int_urb == NULL) + if (dev->int_urb == NULL || atomic_read(&dev->users) == 0) return 0; return usb_submit_urb(dev->int_urb, GFP_NOIO); diff --git a/drivers/media/video/uvc/uvc_v4l2.c b/drivers/media/video/uvc/uvc_v4l2.c index ad7e64f..507542d 100644 --- a/drivers/media/video/uvc/uvc_v4l2.c +++ b/drivers/media/video/uvc/uvc_v4l2.c @@ -439,6 +439,15 @@ 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) { + usb_autopm_put_interface(video->dev->intf); + atomic_dec(&video->dev->users); + kfree(handle); + goto done; + } + } + handle->device = video; handle->state = UVC_HANDLE_PASSIVE; file->private_data = handle; @@ -473,6 +482,9 @@ 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); + usb_autopm_put_interface(video->dev->intf); kref_put(&video->dev->kref, uvc_delete); return 0; diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h index e5014e6..daf0744 100644 --- a/drivers/media/video/uvc/uvcvideo.h +++ b/drivers/media/video/uvc/uvcvideo.h @@ -634,6 +634,7 @@ struct uvc_device { enum uvc_device_state state; struct kref kref; struct list_head list; + atomic_t users; /* Video control interface */ __u16 uvc_version; @@ -770,6 +771,8 @@ extern int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, /* Status */ extern int uvc_status_init(struct uvc_device *dev); extern void uvc_status_cleanup(struct uvc_device *dev); +extern int uvc_status_start(struct uvc_device *dev); +extern void uvc_status_stop(struct uvc_device *dev); extern int uvc_status_suspend(struct uvc_device *dev); extern int uvc_status_resume(struct uvc_device *dev); |
