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>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index cb2c50dbd421..79cbd47f4df7 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);
 }