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

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Message-ID: <20090628214846.GB4584@ami.dom.local>
Date:	Sun, 28 Jun 2009 23:48:46 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	fbl@...hat.com, nhorman@...hat.com, davem@...hat.com,
	Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH] net: fix race in the receive/select

On Sun, Jun 28, 2009 at 08:04:12PM +0200, Oleg Nesterov wrote:
> On 06/28, Jarek Poplawski wrote:
...
> > Hmm... of course:
> >
> > static inline void sock_poll_wait(struct file * filp, struct sock *sk, poll_table *p)
> > {
> >  	if (p && sk->sk_sleep) {
> >  		__poll_wait(filp, sk->sk_sleep, p);
> >  		/*
> >  		 * fat comment
> >  		 */
> >  		smp_mb(); // or smp_mb__after_unlock();
> >  	}
> > }
> 
> Perhaps it makes sense to check ->sk_sleep != NULL in sock_poll_wait(), but
> I don't think we need __poll_wait(). poll_wait() is inline, I think gcc
> will optimize out "if (p && wait_address)" check if poll_wait() is called
> from sock_poll_wait().

Sure, to me it looks a bit more readable, but let Jiri choose.;-)

Cheers,
Jarek P. 
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