USB: cp210x: initialise baud rate at open

commit cdc32fd6 upstream.

The newer cp2104 devices require the baud rate to be initialised after
power on. Make sure it is set when port is opened.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Cc: Preston Fick <preston.fick@silabs.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/cp210x.c

@@ -408,6 +408,10 @@ static int cp210x_open(struct tty_struct *tty, struct usb_serial_port *port)
 	/* Configure the termios structure */
 	cp210x_get_termios(tty, port);
 
+	/* The baud rate must be initialised on cp2104 */
+	if (tty)
+		cp210x_change_speed(tty, port, NULL);
+
 	return usb_serial_generic_open(tty, port);
 }