linux-kernel - [PATCH 4/5] sctp: protocol.c call rcu

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Message-ID: <20090608131143.10052.96470.stgit@localhost>
Date:	Mon, 08 Jun 2009 15:11:43 +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 4/5] sctp: protocol.c call rcu_barrier() on unload.

On module unload call rcu_barrier(), this is needed as synchronize_rcu()
is not strong enough.  The kmem_cache_destroy() does invoke
synchronize_rcu() but it does not provide same protection.

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

 net/sctp/protocol.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index cb2c50d..79cbd47 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -1370,6 +1370,8 @@ SCTP_STATIC __exit void sctp_exit(void)
 	sctp_proc_exit();
 	cleanup_sctp_mibs();
 
+	rcu_barrier(); /* Wait for completion of call_rcu()'s */
+
 	kmem_cache_destroy(sctp_chunk_cachep);
 	kmem_cache_destroy(sctp_bucket_cachep);
 }

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