* Enable the IrDA function if tty->ldisc.num is N_IRDA.
  * In other cases, disable IrDA function.
  */
-static void bfin_set_ldisc(struct tty_struct *tty)
+static void bfin_serial_set_ldisc(struct uart_port *port)
 {
-       int line = tty->index;
+       int line = port->line;
        unsigned short val;
 
-       if (line >= tty->driver->num)
+       if (line >= port->info->tty->driver->num)
                return;
 
-       switch (tty->ldisc.num) {
+       switch (port->info->tty->ldisc.num) {
        case N_IRDA:
                val = UART_GET_GCTL(&bfin_serial_ports[line]);
                val |= (IREN | RPOLC);
        .startup        = bfin_serial_startup,
        .shutdown       = bfin_serial_shutdown,
        .set_termios    = bfin_serial_set_termios,
+       .set_ldisc      = bfin_serial_set_ldisc,
        .type           = bfin_serial_type,
        .release_port   = bfin_serial_release_port,
        .request_port   = bfin_serial_request_port,
 
        ret = uart_register_driver(&bfin_serial_reg);
        if (ret == 0) {
-               bfin_serial_reg.tty_driver->set_ldisc = bfin_set_ldisc;
                ret = platform_driver_register(&bfin_serial_driver);
                if (ret) {
                        pr_debug("uart register failed\n");