netdev - [PATCH] dev_change_name: ignore changes to same name

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Message-ID: <20071024064445.52b1e84e@shemminger-laptop>
Date:	Wed, 24 Oct 2007 06:44:45 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: [PATCH] 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@...ux-foundation.org>

--- a/net/core/dev.c	2007-10-24 06:01:31.000000000 -0700
+++ b/net/core/dev.c	2007-10-24 06:41:18.000000000 -0700
@@ -885,6 +885,9 @@ int dev_change_name(struct net_device *d
 	if (!dev_valid_name(newname))
 		return -EINVAL;

+	if (strncmp(newname, dev->name, IFNAMSIZ) == 0)
+		return 0;
+
 	memcpy(oldname, dev->name, IFNAMSIZ);

 	if (strchr(newname, '%')) {
-
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