uvc_v4l2_poll    1444 drivers/media/usb/uvc/uvc_v4l2.c static __poll_t uvc_v4l2_poll(struct file *file, poll_table *wait)
uvc_v4l2_poll     330 drivers/usb/gadget/function/uvc_v4l2.c uvc_v4l2_poll(struct file *file, poll_table *wait)