From: Eric Dumazet <edumazet@google.com>
Date: Thu, 7 Jun 2012 00:07:20 +0000 (+0000)
Subject: net: l2tp_eth: fix kernel panic on rmmod l2tp_eth
X-Git-Tag: v3.2.23~18
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=43f06c88b9293b6bfb5724757c0c9e7d9e2b2103;hp=dff31bdf228689241933ea5bf62ba98de3eec42e

net: l2tp_eth: fix kernel panic on rmmod l2tp_eth

[ Upstream commit a06998b88b1651c5f71c0e35f528bf2057188ead ]

We must prevent module unloading if some devices are still attached to
l2tp_eth driver.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Tested-by: Denys Fedoryshchenko <denys@visp.net.lb>
Cc: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
index d2726a74597d..3c55f633928e 100644
--- a/net/l2tp/l2tp_eth.c
+++ b/net/l2tp/l2tp_eth.c
@@ -167,6 +167,7 @@ static void l2tp_eth_delete(struct l2tp_session *session)
 		if (dev) {
 			unregister_netdev(dev);
 			spriv->dev = NULL;
+			module_put(THIS_MODULE);
 		}
 	}
 }
@@ -254,6 +255,7 @@ static int l2tp_eth_create(struct net *net, u32 tunnel_id, u32 session_id, u32 p
 	if (rc < 0)
 		goto out_del_dev;
 
+	__module_get(THIS_MODULE);
 	/* Must be done after register_netdev() */
 	strlcpy(session->ifname, dev->name, IFNAMSIZ);