linux-kernel - Re: [PATCH 07/10] decnet: Use rcu

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Message-Id: <1245845367.24921.3.camel@localhost.localdomain>
Date:	Wed, 24 Jun 2009 14:09:27 +0200
From:	Jesper Dangaard Brouer <jdb@...x.dk>
To:	Chrissie Caulfield <christine.caulfield@...glemail.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dougthompson@...ssion.com, bluesmoke-devel@...ts.sourceforge.net,
	axboe@...nel.dk, Patrick McHardy <kaber@...sh.net>,
	Trond.Myklebust@...app.com, linux-wireless@...r.kernel.org,
	johannes@...solutions.net, yoshfuji@...ux-ipv6.org,
	shemminger@...ux-foundation.org, linux-nfs@...r.kernel.org,
	bfields@...ldses.org, neilb@...e.de, linux-ext4@...r.kernel.org,
	tytso@....edu, adilger@....com, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 07/10] decnet: Use rcu_barrier() on module unload.

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 <hawk@...x.dk>

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 <hawk@...x.dk>
---

 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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