net: usbnet: make driver_info const

The driver_info field that is used for describing each of the usb-net
drivers using the usbnet.c core all declare their information as const
and the usbnet.c itself does not try and modify the struct.

It is therefore a good idea to make this const in the usbnet.c structure
in case anyone tries to modify it.

Signed-off-by: Ben Dooks <[e-mail]>
Signed-off-by: Ben Dooks <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/usb/usbnet.c

···
 int usbnet_stop (struct net_device *net)
 {
 	struct usbnet		*dev = netdev_priv(net);
-	struct driver_info	*info = dev->driver_info;
+	const struct driver_info *info = dev->driver_info;
 	int			retval, pm, mpn;
 
 	clear_bit(EVENT_DEV_OPEN, &dev->flags);
···
 {
 	struct usbnet		*dev = netdev_priv(net);
 	int			retval;
-	struct driver_info	*info = dev->driver_info;
+	const struct driver_info *info = dev->driver_info;
 
 	if ((retval = usb_autopm_get_interface(dev->intf)) < 0) {
 		netif_info(dev, ifup, dev->net,
···
 	}
 
 	if (test_bit (EVENT_LINK_RESET, &dev->flags)) {
-		struct driver_info	*info = dev->driver_info;
+		const struct driver_info *info = dev->driver_info;
 		int			retval = 0;
 
 		clear_bit (EVENT_LINK_RESET, &dev->flags);
···
 	unsigned int			length;
 	struct urb		*urb = NULL;
 	struct skb_data		*entry;
-	struct driver_info	*info = dev->driver_info;
+	const struct driver_info *info = dev->driver_info;
 	unsigned long		flags;
 	int retval;
 
···
 	struct usbnet			*dev;
 	struct net_device		*net;
 	struct usb_host_interface	*interface;
-	struct driver_info		*info;
+	const struct driver_info	*info;
 	struct usb_device		*xdev;
 	int				status;
 	const char			*name;
···
 	}
 
 	name = udev->dev.driver->name;
-	info = (struct driver_info *) prod->driver_info;
+	info = (const struct driver_info *) prod->driver_info;
 	if (!info) {
 		dev_dbg (&udev->dev, "blacklisted by %s\n", name);
 		return -ENODEV;

include/linux/usb/usbnet.h

···
 	/* housekeeping */
 	struct usb_device	*udev;
 	struct usb_interface	*intf;
-	struct driver_info	*driver_info;
+	const struct driver_info *driver_info;
 	const char		*driver_name;
 	void			*driver_priv;
 	wait_queue_head_t	wait;