HUBD_CHILD_EVENT_DISCONNECT
hubd->h_child_events[port] |= HUBD_CHILD_EVENT_DISCONNECT;
hubd->h_child_events[port] &= ~HUBD_CHILD_EVENT_DISCONNECT;
if (hubd->h_child_events[port] & HUBD_CHILD_EVENT_DISCONNECT) {
~HUBD_CHILD_EVENT_DISCONNECT;
hubd->h_child_events[port] |= HUBD_CHILD_EVENT_DISCONNECT;