diff options
Diffstat (limited to 'drivers/media/usb/uvc/uvc_ctrl.c')
| -rw-r--r-- | drivers/media/usb/uvc/uvc_ctrl.c | 30 |
1 files changed, 20 insertions, 10 deletions
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 36abe47997b0..e0d894c61f4b 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -6,6 +6,7 @@ * Laurent Pinchart (laurent.pinchart@ideasonboard.com) */ +#include <asm/barrier.h> #include <linux/kernel.h> #include <linux/list.h> #include <linux/module.h> @@ -1275,17 +1276,12 @@ static void uvc_ctrl_send_slave_event(struct uvc_video_chain *chain, uvc_ctrl_send_event(chain, handle, ctrl, mapping, val, changes); } -static void uvc_ctrl_status_event_work(struct work_struct *work) +void uvc_ctrl_status_event(struct uvc_video_chain *chain, + struct uvc_control *ctrl, const u8 *data) { - struct uvc_device *dev = container_of(work, struct uvc_device, - async_ctrl.work); - struct uvc_ctrl_work *w = &dev->async_ctrl; - struct uvc_video_chain *chain = w->chain; struct uvc_control_mapping *mapping; - struct uvc_control *ctrl = w->ctrl; struct uvc_fh *handle; unsigned int i; - int ret; mutex_lock(&chain->ctrl_mutex); @@ -1293,7 +1289,7 @@ static void uvc_ctrl_status_event_work(struct work_struct *work) ctrl->handle = NULL; list_for_each_entry(mapping, &ctrl->info.mappings, list) { - s32 value = __uvc_ctrl_get_value(mapping, w->data); + s32 value = __uvc_ctrl_get_value(mapping, data); /* * handle may be NULL here if the device sends auto-update @@ -1312,6 +1308,20 @@ static void uvc_ctrl_status_event_work(struct work_struct *work) } mutex_unlock(&chain->ctrl_mutex); +} + +static void uvc_ctrl_status_event_work(struct work_struct *work) +{ + struct uvc_device *dev = container_of(work, struct uvc_device, + async_ctrl.work); + struct uvc_ctrl_work *w = &dev->async_ctrl; + int ret; + + uvc_ctrl_status_event(w->chain, w->ctrl, w->data); + + /* The barrier is needed to synchronize with uvc_status_stop(). */ + if (smp_load_acquire(&dev->flush_status)) + return; /* Resubmit the URB. */ w->urb->interval = dev->int_ep->desc.bInterval; @@ -1321,8 +1331,8 @@ static void uvc_ctrl_status_event_work(struct work_struct *work) ret); } -bool uvc_ctrl_status_event(struct urb *urb, struct uvc_video_chain *chain, - struct uvc_control *ctrl, const u8 *data) +bool uvc_ctrl_status_event_async(struct urb *urb, struct uvc_video_chain *chain, + struct uvc_control *ctrl, const u8 *data) { struct uvc_device *dev = chain->dev; struct uvc_ctrl_work *w = &dev->async_ctrl; |