[PATCH 4/5] sctp: protocol.c call rcu_barrier() on unload.

[Jesper Dangaard Brouer]

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@xxxxxxx>
---

 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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