netdev - [PATCH] ipv6: Fix "waiting for %s to become free" hang

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Message-Id: <20091204112734.24535.86096.sendpatchset@localhost.localdomain>
Date:	Fri, 04 Dec 2009 16:57:34 +0530
From:	Krishna Kumar <krkumar2@...ibm.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Krishna Kumar <krkumar2@...ibm.com>
Subject: [PATCH] ipv6: Fix "waiting for %s to become free" hang

From: Krishna Kumar <krkumar2@...ibm.com>

(From code-walkthrough, and untested)

Fix "waiting for %s to become free" hang. dev has an
extra hold (by ip6mr_reg_vif) which was not dropped
before calling unregister_netdevice.

Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>
---
 net/ipv6/ip6mr.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -ruNp org/net/ipv6/ip6mr.c new/net/ipv6/ip6mr.c
--- org/net/ipv6/ip6mr.c	2009-12-04 16:08:07.000000000 +0530
+++ new/net/ipv6/ip6mr.c	2009-12-04 16:09:56.000000000 +0530
@@ -648,8 +648,8 @@ static int mif6_add(struct net *net, str
 			return -ENOBUFS;
 		err = dev_set_allmulti(dev, 1);
 		if (err) {
-			unregister_netdevice(dev);
 			dev_put(dev);
+			unregister_netdevice(dev);
 			return err;
 		}
 		break;
--
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