MAX_OUT_PACKET
ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);