Subject: Re: [PATCH 5/5] sunrpc/auth_gss: Call rcu_barrier() on module unload.

From: "Paul E. McKenney" <[email-masked]>
Date: Mon, 8 Jun 2009 09:26:56 -0700

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 <[email-masked]>

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