linux-kernel - [PATCH 2/5] nfnetlink_queue: Use rcu

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Message-ID: <20090608131133.10052.40836.stgit@localhost>
Date:	Mon, 08 Jun 2009 15:11:33 +0200
From:	Jesper Dangaard Brouer <hawk@...x.dk>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Jesper Dangaard Brouer <hawk@...x.dk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	urs.thuermann@...kswagen.de, oliver.hartkopp@...kswagen.de,
	wg@...ndegger.com, vladislav.yasevich@...com, sri@...ibm.com,
	linux-sctp@...r.kernel.org, Trond.Myklebust@...app.com,
	linux-nfs@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: [PATCH 2/5] nfnetlink_queue: Use rcu_barrier() on module unload.

This module uses rcu_call() thus it should use rcu_barrier() on module unload.

Also fixed a trivial typo 'nfetlink' -> 'nfnetlink' in comment.

Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk>
---

 net/netfilter/nfnetlink_queue.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/net/netfilter/nfnetlink_queue.c b/net/netfilter/nfnetlink_queue.c
index 8c86011..71daa09 100644
--- a/net/netfilter/nfnetlink_queue.c
+++ b/net/netfilter/nfnetlink_queue.c
@@ -1,6 +1,6 @@
 /*
  * This is a module which is used for queueing packets and communicating with
- * userspace via nfetlink.
+ * userspace via nfnetlink.
  *
  * (C) 2005 by Harald Welte <laforge@...filter.org>
  * (C) 2007 by Patrick McHardy <kaber@...sh.net>
@@ -932,6 +932,8 @@ static void __exit nfnetlink_queue_fini(void)
 #endif
 	nfnetlink_subsys_unregister(&nfqnl_subsys);
 	netlink_unregister_notifier(&nfqnl_rtnl_notifier);
+
+	rcu_barrier(); /* Wait for completion of call_rcu()'s */
 }
 
 MODULE_DESCRIPTION("netfilter packet queue handler");

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