sky2: use debugfs rename

Use debugfs rename to handle device neame changes.
Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/sky2.c

@@ -3841,16 +3841,19 @@ static int sky2_device_event(struct notifier_block *unused,
 			     unsigned long event, void *ptr)
 {
 	struct net_device *dev = ptr;
-
-	if (dev->open == sky2_up) {
 	struct sky2_port *sky2 = netdev_priv(dev);
 
+	if (dev->open != sky2_up || !sky2_debug)
+		return NOTIFY_DONE;
+
 	switch(event) {
 	case NETDEV_CHANGENAME:
-			if (!netif_running(dev))
+		if (sky2->debugfs) {
+			sky2->debugfs = debugfs_rename(sky2_debug, sky2->debugfs,
+						       sky2_debug, dev->name);
+		}
 		break;
-			/* fallthrough */
-		case NETDEV_DOWN:
+
 	case NETDEV_GOING_DOWN:
 		if (sky2->debugfs) {
 			printk(KERN_DEBUG PFX "%s: remove debugfs\n",
@@ -3858,25 +3861,14 @@ static int sky2_device_event(struct notifier_block *unused,
 			debugfs_remove(sky2->debugfs);
 			sky2->debugfs = NULL;
 		}
-
-			if (event != NETDEV_CHANGENAME)
 		break;
-			/* fallthrough for changename */
+
 	case NETDEV_UP:
-			if (sky2_debug) {
-				struct dentry *d;
-				d = debugfs_create_file(dev->name, S_IRUGO,
+		sky2->debugfs = debugfs_create_file(dev->name, S_IRUGO,
 						    sky2_debug, dev,
 						    &sky2_debug_fops);
-				if (d == NULL || IS_ERR(d))
-					printk(KERN_INFO PFX
-					       "%s: debugfs create failed\n",
-					       dev->name);
-				else
-					sky2->debugfs = d;
-			}
-			break;
-		}
+		if (IS_ERR(sky2->debugfs))
+			sky2->debugfs = NULL;
 	}
 
 	return NOTIFY_DONE;