ehci_get_ownership
ehci_get_ownership(&sc->sc, sc->sc_pc, sc->sc_tag);
ehci_get_ownership(&sc->sc, pc, tag);
ehci_get_ownership(&sc->sc, sc->sc_pc, sc->sc_tag);
static void ehci_get_ownership(ehci_softc_t *, pci_chipset_tag_t, pcitag_t);