netdev - Re: [0/4] Fix addrconf race conditions

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Date:	Wed, 19 May 2010 08:35:42 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	shemminger@...tta.com, jbohac@...e.cz, yoshfuji@...ux-ipv6.org,
	netdev@...r.kernel.org
Subject: Re: [0/4] Fix addrconf race conditions

On Tue, May 18, 2010 at 03:27:59PM -0700, David Miller wrote:
> From: Stephen Hemminger <shemminger@...tta.com>
> Date: Tue, 18 May 2010 10:25:50 -0700
> 
> > I wonder if so many fine grained locks are really necessary at
> > all.  Everything but timers looks like it is under RTNL mutex
> > already.
> 
> I can't see any reasonable alternative, and it took weeks to get
> a fix at all.

Right, the issue is with forcing an immediate effect after an
NDISC packet triggers an address addition/deletion.

>From what I can gather, the hard case was with NDISC address
addition with DAD disabled.  That is, you have an NDISC packet
that causes an addition followed immediately by a packet destined
(or otherwise relying on) that new address.  In that case, we
simply have no chance of using the RTNL.

Cheers,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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