USBLP_DEVICE_ID_SIZE
usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL);
err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1);
else if (length >= USBLP_DEVICE_ID_SIZE)
length = USBLP_DEVICE_ID_SIZE - 1;