netdev - Re: [patch] ipvs: Use atomic operations atomicly

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Message-ID: <20090831144909.GB2271@verge.net.au>
Date:	Tue, 1 Sep 2009 00:49:09 +1000
From:	Simon Horman <horms@...ge.net.au>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	홍신 shin hong <hongshin@...il.com>,
	David Miller <davem@...emloft.net>
Subject: Re: [patch] ipvs: Use atomic operations atomicly

On Mon, Aug 31, 2009 at 02:22:26PM +0200, Patrick McHardy wrote:
> Simon Horman wrote:
> > A pointed out by Shin Hong, IPVS doesn't always use atomic operations
> > in an atomic manner. While this seems unlikely to be manifest in
> > strange behaviour, it seems appropriate to clean this up.
> > 
> > Cc: 홍신 shin hong <hongshin@...il.com>
> > Signed-off-by: Simon Horman <horms@...ge.net.au>
> 
> Applied, thanks.
> 
> >  	if (af == AF_INET &&
> >  	    (ip_vs_sync_state & IP_VS_STATE_MASTER) &&
> >  	    (((cp->protocol != IPPROTO_TCP ||
> >  	       cp->state == IP_VS_TCP_S_ESTABLISHED) &&
> > -	      (atomic_read(&cp->in_pkts) % sysctl_ip_vs_sync_threshold[1]
> > +	      (pkts % sysctl_ip_vs_sync_threshold[1]
> 
> It seems that proc_do_sync_threshold() should check whether this value
> is zero. The current checks also look racy since incorrect values are
> first updated, then overwritten again.

Thanks, I'll look into that.
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