From: Jesper Dangaard Brouer Subject: Re: [PATCH 07/10] decnet: Use rcu_barrier() on module unload. Date: Wed, 24 Jun 2009 14:09:27 +0200 Message-ID: <1245845367.24921.3.camel@localhost.localdomain> References: <20090623150330.22490.87327.stgit@localhost> <20090623150429.22490.15113.stgit@localhost> <4A41C67E.8070301@googlemail.com> <1245843884.6695.54.camel@localhost.localdomain> Reply-To: jdb-4UpuNZONu4c@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain Cc: "David S. Miller" , "Paul E. McKenney" , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, dougthompson@xmission.com, bluesmoke-devel@lists.sourceforge.net, axboe@kernel.dk, Patrick McHardy , Trond.Myklebust@netapp.com, linux-wireless@vger.kernel.org, johannes@sipsolutions.net, yoshfuji@linux-ipv6.org, shemminger@linux-foundation.org, linux-nfs@vger.kernel.org, bfields@fieldses.org, neilb@suse.de, linux-ext4@vger.kernel.org, tytso@mit.edu, adilger-xsfywfwIY+M@public.gmane.org, netfilter-devel@vger.kernel.org To: Chrissie Caulfield Return-path: Received: from lanfw001a.cxnet.dk ([87.72.215.196]:41632 "EHLO lanfw001a.cxnet.dk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751058AbZFXMJ0 (ORCPT ); Wed, 24 Jun 2009 08:09:26 -0400 In-Reply-To: <1245843884.6695.54.camel-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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 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 --- 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