usb_bus_port_get_device
child = usb_bus_port_get_device(bus, hub->ports + x);
udev = usb_bus_port_get_device(hub->hubudev->bus,
child = usb_bus_port_get_device(udev->bus,
child = usb_bus_port_get_device(udev->bus, up);
child = usb_bus_port_get_device(bus, up);
child = usb_bus_port_get_device(udev->bus,
child = usb_bus_port_get_device(udev->bus,
struct usb_device *usb_bus_port_get_device(struct usb_bus *bus,