FWDEVINVAL
if (fwdev->status != FWDEVINVAL) {
fwdev->status = FWDEVINVAL;
if (fwdev->dst == dst && fwdev->status != FWDEVINVAL)
fc->ongodev->status = FWDEVINVAL;
} else if (fwdev->status == FWDEVINVAL) {
if(fwdev->status == FWDEVINVAL) return NULL;
(fwdev->status == FWDEVINVAL)?0:1;