b_interface_number  739 drivers/usb/gadget/function/uvc_configfs.c UVC_ATTR_RO(uvcg_default_control_, b_interface_number, bInterfaceNumber);
b_interface_number 2342 drivers/usb/gadget/function/uvc_configfs.c UVC_ATTR_RO(uvcg_default_streaming_, b_interface_number, bInterfaceNumber);