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

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Message-ID: <4A9BC082.3090804@trash.net>
Date:	Mon, 31 Aug 2009 14:22:26 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Simon Horman <horms@...ge.net.au>
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

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.

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