RFCOMM_MTU_MIN
pn.mtu = uimax(pn.mtu, RFCOMM_MTU_MIN);
if (pn.mtu < RFCOMM_MTU_MIN || pn.mtu > dlc->rd_mtu) {
if (rs->rs_mtu < RFCOMM_MTU_MIN) {
if (mtu < RFCOMM_MTU_MIN || mtu > RFCOMM_MTU_MAX)