VIO_DR_STATE_TXREQ
vio->dr_state = (VIO_DR_STATE_TXREQ |
vio->dr_state = VIO_DR_STATE_TXREQ;
if ((vio->dr_state & VIO_DR_STATE_TXREQ) &&
need_tx = (vio->dr_state & VIO_DR_STATE_TXREQ);
if (!(vio->dr_state & VIO_DR_STATE_TXREQ))