Hi Johan Thanks for the quick response. > > +static int mxuport_dtr(struct usb_serial_port *port, int on) > > +{ > > + struct mxuport_port *mxport = usb_get_serial_port_data(port); > > + int err; > > + > > + mutex_lock(&mxport->mutex); > > + > > + if (on) > > + mxport->mcr_state |= UART_MCR_DTR; > > + else > > + mxport->mcr_state &= ~UART_MCR_DTR; > > + > > + err = mxuport_set_mcr(port, mxport->mcr_state); > > + > > + mutex_unlock(&mxport->mutex); > > + > > + return err; > > +} > > You should probably use SET_DTR (and rename the function > mxuport_set_dtr). I considered mxuport_set_dtr(), but it does not really fit with the usb-serial naming. tty_port_operations has dtr_rts, not set_dtr_rts. usb_serial_driver also has dtr_rts, not set_dtr_rts. Andrew -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html