usbnet: Add stop function pointer to 'struct rndis_data'.

Allow minidriver to know that netdev has stopped. This is to let
wireless turn off radio when usbnet dev is stopped.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/usb/usbnet.c

@@ -575,7 +575,9 @@ EXPORT_SYMBOL_GPL(usbnet_unlink_rx_urbs);
 int usbnet_stop (struct net_device *net)
 {
 	struct usbnet		*dev = netdev_priv(net);
+	struct driver_info	*info = dev->driver_info;
 	int			temp;
+	int			retval;
 	DECLARE_WAIT_QUEUE_HEAD_ONSTACK (unlink_wakeup);
 	DECLARE_WAITQUEUE (wait, current);
 
@@ -587,6 +589,18 @@ int usbnet_stop (struct net_device *net)
 			net->stats.rx_errors, net->stats.tx_errors
 			);
 
+	/* allow minidriver to stop correctly (wireless devices to turn off
+	 * radio etc) */
+	if (info->stop) {
+		retval = info->stop(dev);
+		if (retval < 0 && netif_msg_ifdown(dev))
+			devinfo(dev,
+				"stop fail (%d) usbnet usb-%s-%s, %s",
+				retval,
+				dev->udev->bus->bus_name, dev->udev->devpath,
+				info->description);
+	}
+
 	// ensure there are no more active urbs
 	add_wait_queue (&unlink_wakeup, &wait);
 	dev->wait = &unlink_wakeup;

include/linux/usb/usbnet.h

@@ -97,6 +97,9 @@ struct driver_info {
 	/* reset device ... can sleep */
 	int	(*reset)(struct usbnet *);
 
+	/* stop device ... can sleep */
+	int	(*stop)(struct usbnet *);
+
 	/* see if peer is connected ... can sleep */
 	int	(*check_connect)(struct usbnet *);