linux-kernel - Re: [PATCH 5/5] sunrpc/auth_gss: Call rcu

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Message-ID: <20090608162656.GF6961@linux.vnet.ibm.com>
Date:	Mon, 8 Jun 2009 09:26:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Jesper Dangaard Brouer <hawk@...x.dk>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, urs.thuermann@...kswagen.de,
	oliver.hartkopp@...kswagen.de, wg@...ndegger.com,
	vladislav.yasevich@...com, sri@...ibm.com,
	linux-sctp@...r.kernel.org, Trond.Myklebust@...app.com,
	linux-nfs@...r.kernel.org, netfilter-devel@...r.kernel.org
Subject: Re: [PATCH 5/5] sunrpc/auth_gss: Call rcu_barrier() on module
	unload.

On Mon, Jun 08, 2009 at 03:11:48PM +0200, Jesper Dangaard Brouer wrote:
> As the module uses rcu_call() we should make sure that all
> rcu callback has been completed before removing the code.

Good improvement!!!  Assuming that gss_svc_shutdown() and
rpcauth_unregister() prevent any future RCU callbacks to be registered,
this patch will fix things up.

Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>

> Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk>
> ---
> 
>  net/sunrpc/auth_gss/auth_gss.c |    1 +
>  1 files changed, 1 insertions(+), 0 deletions(-)
> 
> diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
> index e630b38..66d458f 100644
> --- a/net/sunrpc/auth_gss/auth_gss.c
> +++ b/net/sunrpc/auth_gss/auth_gss.c
> @@ -1548,6 +1548,7 @@ static void __exit exit_rpcsec_gss(void)
>  {
>  	gss_svc_shutdown();
>  	rpcauth_unregister(&authgss_ops);
> +	rcu_barrier(); /* Wait for completion of call_rcu()'s */
>  }
> 
>  MODULE_LICENSE("GPL");
> 
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