linux-kernel - Re: [PATCH] net: fix race in the receive/select

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Message-ID: <20090629093413.GC3845@jolsa.lab.eng.brq.redhat.com>
Date:	Mon, 29 Jun 2009 11:34:13 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>, davidel@...ilserver.org,
	oleg@...hat.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, fbl@...hat.com, nhorman@...hat.com,
	htejun@...il.com
Subject: Re: [PATCH] net: fix race in the receive/select

On Fri, Jun 26, 2009 at 09:35:28PM +0200, Eric Dumazet wrote:
> David Miller a écrit :
> > From: Davide Libenzi <davidel@...ilserver.org>
> > Date: Fri, 26 Jun 2009 11:12:15 -0700 (PDT)
> > 
> >> On Fri, 26 Jun 2009, Oleg Nesterov wrote:
> >>
> >>> Perhaps we can add
> >>>
> >>> 	void sock_poll_wait(struct file *file, struct sock *sk, poll_table *pt)
> >>> 	{
> >>> 		if (pt) {
> >>> 			poll_wait(file, sk->sk_sleep, pt);
> >>> 			/*
> >>> 			 * fat comment
> >>> 			 */
> >>> 			smp_mb(); // or smp_mb__after_unlock();
> >>> 		}
> >>> 	}
> >> That'd be fine IMHO. Are DaveM and Eric OK?
> > 
> > No objections from me.
> 
> Very good :)
> 
> Jiri, please respin a patch with this idea from Oleg
> 
> (We'll have to check all calls to poll_wait() in net tree)
> 
> Thanks everybody
>

thanks a lot! :) I'll send out new patch shortly..

I'll include all the poll_wait calls change I'm kind of sure of,
and list of others I'm not, so we can discuss them.

jirka
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