USB: option: use usb_{get,set}_serial_data

Use usb_{get,set}_serial_data to access usb-serial data.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/serial/option.c

@@ -1347,12 +1347,15 @@ static int option_probe(struct usb_serial *serial,
 		serial->interface->cur_altsetting->desc.bInterfaceClass != USB_CLASS_CDC_DATA)
 		return -ENODEV;
 
-	data = serial->private = kzalloc(sizeof(struct usb_wwan_intf_private), GFP_KERNEL);
+	data = kzalloc(sizeof(struct usb_wwan_intf_private), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 	data->send_setup = option_send_setup;
 	spin_lock_init(&data->susp_lock);
 	data->private = (void *)id->driver_info;
+
+	usb_set_serial_data(serial, data);
+
 	return 0;
 }
 
@@ -1419,8 +1422,7 @@ static void option_instat_callback(struct urb *urb)
 static int option_send_setup(struct usb_serial_port *port)
 {
 	struct usb_serial *serial = port->serial;
-	struct usb_wwan_intf_private *intfdata =
-		(struct usb_wwan_intf_private *) serial->private;
+	struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
 	struct option_port_private *portdata;
 	int ifNum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
 	int val = 0;