[NET]: unregister_netdevice as void

There was no real useful information from the unregister_netdevice() return
code, the only error occurred in a situation that was a driver bug. So
change it to a void function.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netdevice.h

@@ -589,7 +589,7 @@ extern int		dev_open(struct net_device *dev);
 extern int		dev_close(struct net_device *dev);
 extern int		dev_queue_xmit(struct sk_buff *skb);
 extern int		register_netdevice(struct net_device *dev);
-extern int		unregister_netdevice(struct net_device *dev);
+extern void		unregister_netdevice(struct net_device *dev);
 extern void		free_netdev(struct net_device *dev);
 extern void		synchronize_net(void);
 extern int 		register_netdevice_notifier(struct notifier_block *nb);

net/core/dev.c

@@ -3247,7 +3247,7 @@ void synchronize_net(void)
  *	unregister_netdev() instead of this.
  */
 
-int unregister_netdevice(struct net_device *dev)
+void unregister_netdevice(struct net_device *dev)
 {
 	struct net_device *d, **dp;
 
@@ -3258,7 +3258,9 @@ int unregister_netdevice(struct net_device *dev)
 	if (dev->reg_state == NETREG_UNINITIALIZED) {
 		printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
 				  "was registered\n", dev->name, dev);
-		return -ENODEV;
+
+		WARN_ON(1);
+		return;
 	}
 
 	BUG_ON(dev->reg_state != NETREG_REGISTERED);
@@ -3280,11 +3282,7 @@ int unregister_netdevice(struct net_device *dev)
 			break;
 		}
 	}
-	if (!d) {
-		printk(KERN_ERR "unregister net_device: '%s' not found\n",
-		       dev->name);
-		return -ENODEV;
-	}
+	BUG_ON(!d);
 
 	dev->reg_state = NETREG_UNREGISTERING;
 
@@ -3316,7 +3314,6 @@ int unregister_netdevice(struct net_device *dev)
 	synchronize_net();
 
 	dev_put(dev);
-	return 0;
 }
 
 /**

net/ipv4/ip_gre.c

@@ -1008,7 +1008,8 @@ ipgre_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 				goto done;
 			dev = t->dev;
 		}
-		err = unregister_netdevice(dev);
+		unregister_netdevice(dev);
+		err = 0;
 		break;
 
 	default:

net/ipv4/ipip.c

@@ -754,7 +754,8 @@ ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 				goto done;
 			dev = t->dev;
 		}
-		err = unregister_netdevice(dev);
+		unregister_netdevice(dev);
+		err = 0;
 		break;
 
 	default:

net/ipv6/ip6_tunnel.c

@@ -999,7 +999,8 @@ ip6ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 				break;
 			dev = t->dev;
 		}
-		err = unregister_netdevice(dev);
+		err = 0;
+		unregister_netdevice(dev);
 		break;
 	default:
 		err = -EINVAL;

net/ipv6/sit.c

@@ -686,7 +686,8 @@ ipip6_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)
 				goto done;
 			dev = t->dev;
 		}
-		err = unregister_netdevice(dev);
+		unregister_netdevice(dev);
+		err = 0;
 		break;
 
 	default: