804 	struct device *dv = NULL;  local
807 		dv = (struct device *)(cd->cd_devs[unit]);
809 	if (!dv)
812 	if (!(dv->dv_flags & DVF_ACTIVE))
813 		dv = NULL;
815 	if (dv != NULL)
816 		device_ref(dv);
818 	return (dv);
829 device_ref(dv)  in device_ref()  argument
830 	struct device *dv;  in device_ref()
832 	dv->dv_ref++;
844 device_unref(dv)  in device_unref()  argument
845 	struct device *dv;  in device_unref()
847 	dv->dv_ref--;
848 	if (dv->dv_ref == 0) {
849 		if (dv->dv_cfdata->cf_attach->ca_zeroref)
850 			(*dv->dv_cfdata->cf_attach->ca_zeroref)(dv);
852 		free(dv, M_DEVBUF);