* @driver: the driver (USB in our case)
* @tty: the tty being created
*
- * Create the termios objects for this tty. We use the default
+ * Initialise the termios structure for this tty. We use the default
* USB serial settings but permit them to be overridden by
- * serial->type->init_termios.
+ * serial->type->init_termios on first open.
*
* This is the first place a new tty gets used. Hence this is where we
* acquire references to the usb_serial structure and the driver module,
int idx = tty->index;
struct usb_serial *serial;
struct usb_serial_port *port;
+ bool init_termios;
int retval = -ENODEV;
port = usb_serial_port_get_by_minor(idx);
if (retval)
goto error_get_interface;
+ init_termios = (driver->termios[idx] == NULL);
+
retval = tty_standard_install(driver, tty);
if (retval)
goto error_init_termios;
mutex_unlock(&serial->disc_mutex);
- /* allow the driver to update the settings */
- if (serial->type->init_termios)
+ /* allow the driver to update the initial settings */
+ if (init_termios && serial->type->init_termios)
serial->type->init_termios(tty);
tty->driver_data = port;