netdev - Re: [PATCH net-next 1/2] Phonet: put protocols array under RCU

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Date:	Mon, 16 Nov 2009 19:34:00 +0200
From:	"Rémi Denis-Courmont" <remi@...lab.net>
To:	paulmck@...ux.vnet.ibm.com
Cc:	netdev@...r.kernel.org,
	"Rémi Denis-Courmont" 
	<remi.denis-courmont@...ia.com>
Subject: Re: [PATCH net-next 1/2] Phonet: put protocols array under RCU

Le lundi 16 novembre 2009 19:26:17 Paul E. McKenney, vous avez écrit :
> On Fri, Nov 13, 2009 at 05:01:18PM +0200, Rémi Denis-Courmont wrote:
> > From: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
> >
> > Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
> > ---
> >  net/phonet/af_phonet.c |   20 +++++++++++---------
> >  1 files changed, 11 insertions(+), 9 deletions(-)
> >
> > diff --git a/net/phonet/af_phonet.c b/net/phonet/af_phonet.c
> > index 8d3a55b..ed65da2 100644
> > --- a/net/phonet/af_phonet.c
> > +++ b/net/phonet/af_phonet.c
> > @@ -35,7 +35,6 @@
> >
> >  /* Transport protocol registration */
> >  static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly;
> > -static DEFINE_SPINLOCK(proto_tab_lock);
> >
> >  static struct phonet_protocol *phonet_proto_get(int protocol)
> >  {
> > @@ -44,11 +43,11 @@ static struct phonet_protocol *phonet_proto_get(int
> > protocol) if (protocol >= PHONET_NPROTO)
> >  		return NULL;
> >
> > -	spin_lock(&proto_tab_lock);
> > +	rcu_read_lock();
> >  	pp = proto_tab[protocol];
> 
> Don't we need an rcu_dereference() in here somewhere?
> 
> Perhaps something like the following?

Err yes, we do.

-- 
Rémi Denis-Courmont
http://www.remlab.net/
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