usb_callout_drain
usb_callout_drain(&xsc->sc_callout);
usb_callout_drain(&sc->sc_timer);
usb_callout_drain(&sc->sc_tmo_pcd);
usb_callout_drain(&sc->sc_tmo_poll);
usb_callout_drain(&sc->sc_tmo_rhsc);
usb_callout_drain(&sc->sc_root_intr);
usb_callout_drain(&bus->power_wdog);
usb_callout_drain(&sc->sc_callout);
usb_callout_drain(&sc->sc_callout);
usb_callout_drain(&sc->sc_watchdog);
usb_callout_drain(&sc->sc_callout);
usb_callout_drain(&sc->sc_callout);
usb_callout_drain(&sc->sc_watchdog);
usb_callout_drain(&sc->sc_button_press_callout);
usb_callout_drain(&sc->sc_cursor_update_callout);
usb_callout_drain(&sc->sc_watchdog);
usb_callout_drain(&sc->sc_callout);
usb_callout_drain(&sc->sc_callout);
usb_callout_drain(&sc->sc_statechg_timer);
usb_callout_drain(&sc->sc_if_sync_ch);
usb_callout_drain(&ue->ue_watchdog);
usb_callout_drain(&sc->sc_watchdog);
usb_callout_drain(&sc->sc_watchdog);
usb_callout_drain(&xfer->timeout_handle);
usb_callout_drain(&sc->ratectl_ch);
usb_callout_drain(&rvp->ratectl_ch);
usb_callout_drain(&sc->ratectl_ch);
usb_callout_drain(&uvp->ratectl_ch);
usb_callout_drain(&sc->sc_led_ch);