result = DEVICE_PROBE(child);
hereif child is a nexus device ,then like polystate in OOP,it will
call nexus's DEVMETHOD :nexus_probe,
it is really great:)
nexus_probe
in device_probe_child(device_t dev, device_t child) in subr_bus.c
static device_method_t nexus_methods[] = {
DEVMETHOD(device_probe, nexus_probe),
In nexus.c
--
we who r about to die,salute u!