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

From: Jesper Dangaard Brouer <[email-masked]>
Date: Wed, 24 Jun 2009 14:09:27 +0200

On Wed, 2009-06-24 at 13:44 +0200, Jesper Dangaard Brouer wrote:
> On Wed, 2009-06-24 at 07:23 +0100, Chrissie Caulfield wrote:
> > The issues with DECnet module unloading are a little more than just an
> > RCU leak I think!
> > 
> > Though that area does need reviewing ... when I get some time.
> 
> Fine.  Now you have read my comment in the code, then there is a updated
> patch below.  Will you ack-that?

Sorry wrong patch... forgot save the code and 'stg refresh'... 

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

From: Jesper Dangaard Brouer <[email-masked]>

The decnet module unloading as been disabled with a '#if 0' statement,
because it have had issues.

We add a rcu_barrier() anyhow for correctness.

The maintainer (Chrissie Caulfield) will look into the unload issue
when time permits.

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

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

diff --git a/net/decnet/af_decnet.c b/net/decnet/af_decnet.c
index d351b8d..77d4028 100644
--- a/net/decnet/af_decnet.c
+++ b/net/decnet/af_decnet.c
@@ -2413,6 +2413,8 @@ 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

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