From: David Miller <davem@davemloft.net>
To: shemminger@linux-foundation.org
Cc: a.p.zijlstra@chello.nl, linux-kernel@vger.kernel.org,
netdev@vger.kernel.org, jdike@addtoit.com
Subject: Re: [PATCH] net: fix race in process_backlog
Date: Wed, 03 Oct 2007 16:39:02 -0700 (PDT) [thread overview]
Message-ID: <20071003.163902.51840119.davem@davemloft.net> (raw)
In-Reply-To: <20071003150519.1fd206a8@freepuppy.rosehill>
From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Wed, 3 Oct 2007 15:05:19 -0700
> On Wed, 03 Oct 2007 14:58:07 -0700 (PDT)
> David Miller <davem@davemloft.net> wrote:
>
> > From: Peter Zijlstra <a.p.zijlstra@chello.nl>
> > Date: Wed, 03 Oct 2007 17:44:53 +0200
> >
> > > Index: linux-2.6/net/core/dev.c
> > > ===================================================================
> > > --- linux-2.6.orig/net/core/dev.c
> > > +++ linux-2.6/net/core/dev.c
> > > @@ -2095,11 +2095,11 @@ static int process_backlog(struct napi_s
> > >
> > > local_irq_disable();
> > > skb = __skb_dequeue(&queue->input_pkt_queue);
> > > - local_irq_enable();
> > > if (!skb) {
> > > - napi_complete(napi);
> > > + __napi_complete(napi);
> > > break;
> > > }
> > > + local_irq_enable();
> >
> > What re-enables interrupts in the !skb path?
>
> This looks like a better fix. the irq_enable is needed in both cases.
Yep, applied, thanks Peter and Stephen.
prev parent reply other threads:[~2007-10-03 23:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-03 15:44 [PATCH] net: fix race in process_backlog Peter Zijlstra
2007-10-03 16:15 ` Stephen Hemminger
2007-10-03 21:58 ` David Miller
2007-10-03 22:05 ` Stephen Hemminger
2007-10-03 23:39 ` David Miller [this message]
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