From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Fri, 26 Oct 2007 10:53:42 +0000 (-0700)
Subject: [NET] dev_change_name: ignore changes to same name
X-Git-Tag: v2.6.24-rc2~132^2~11
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=c8d90dca3211966ba5189e0f3d4bccd558d9ae08;p=linux-2.6-omap-h63xx.git

[NET] dev_change_name: ignore changes to same name

Prevent error/backtrace from dev_rename() when changing
name of network device to the same name. This is a common
situation with udev and other scripts that bind addr to device.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index f1647d7dd14..ddfef3b45ba 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -883,6 +883,9 @@ int dev_change_name(struct net_device *dev, char *newname)
 	if (!dev_valid_name(newname))
 		return -EINVAL;
 
+	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
+		return 0;
+
 	memcpy(oldname, dev->name, IFNAMSIZ);
 
 	if (strchr(newname, '%')) {