DS_RX
if (dir & DS_RX) {
if (dir & DS_RX)
if ((dir & DS_RX) && acm_port->acm_rx_mp) {
rval = usbsacm_fifo_flush_locked(acmp, port_num, DS_TX | DS_RX);
(void) USBSER_DS_FIFO_FLUSH(pp, DS_RX);
if ((dir & DS_RX) && kp->kp_rx_mp) {
if ((dir & DS_RX) && plp->pl_rx_mp) {