Subject: [PATCH 07/10] decnet: Use rcu_barrier() on module unload.

From: Jesper Dangaard Brouer <[email-masked]>
Date: Tue, 23 Jun 2009 17:04:29 +0200

The decnet module unloading as been disabled with a '#if 0' statement,
because it have had issues.  Perhaps using rcu_barrier() will fix
these issues?

Any maintainers with input?

Signed-off-by: Jesper Dangaard Brouer <[email-masked]>
---

 net/decnet/af_decnet.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index d351b8d..bff12da 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -2393,6 +2393,10 @@ module_init(decnet_init);
  * Prevent DECnet module unloading until its fixed properly.
  * Requires an audit of the code to check for memory leaks and
  * initialisation problems etc.
+ *
+ * [email-masked] 2009-06-19:
+ *  I have added a rcu_barrier() which should plug some of your
+ *  module unload issues.  Maintainers please try it out...
  */
 #if 0
 static void __exit decnet_exit(void)
@@ -2413,6 +2417,8 @@ static void __exit decnet_exit(void)
 	proc_net_remove(&init_net, "decnet");
 
 	proto_unregister(&dn_proto);
+
+	rcu_barrier_bh(); /* Wait for completion of call_rcu_bh()'s */
 }
 module_exit(decnet_exit);
 #endif