usb_ac_unit_list_t
usb_ac_unit_list_t *units = uacp->usb_ac_units;
usb_ac_unit_list_t *old = NULL;
sizeof (usb_ac_unit_list_t), KM_SLEEP);
size_t len = max_unit * sizeof (usb_ac_unit_list_t);
usb_ac_unit_list_t *unitp;
sizeof (usb_ac_unit_list_t));
usb_ac_unit_list_t *usb_ac_units;