ddi_hold_devi_by_instance
dip = ddi_hold_devi_by_instance(major, dim->ctrl_node_inst, 0);
if ((iptun_dip = ddi_hold_devi_by_instance(iptun_major, 0, 0)) == NULL)
dip = ddi_hold_devi_by_instance(dsp->dr_major,
if ((dip = ddi_hold_devi_by_instance(major, inst, 0)) == NULL)
dip = ddi_hold_devi_by_instance(major, instance,
ddi_hold_devi_by_instance(major_t major, int instance, int flags);
if ((dip = ddi_hold_devi_by_instance(getmajor(vnp->v_rdev),