From: Jesper Dangaard Brouer <hawk@comx.dk>
Date: Mon, 8 Jun 2009 03:11:43 +0000 (+0000)
Subject: sctp: protocol.c call rcu_barrier() on unload.
X-Git-Tag: v2.6.31-rc1~14^2~144
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=eaa184a1a1cda3991420c47bc960ddea6cbacff2;p=profile%2Fivi%2Fkernel-x86-ivi.git

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@comx.dk>
Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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);
 }