netdev - Re: 2.6.38-rc1: arp triggers RTNL assertion

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Message-ID: <1295647999.2609.31.camel@edumazet-laptop>
Date:	Fri, 21 Jan 2011 23:13:19 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	jamie@...ible.transient.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 2.6.38-rc1: arp triggers RTNL assertion

Le vendredi 21 janvier 2011 à 13:06 -0800, David Miller a écrit :
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Fri, 21 Jan 2011 19:52:56 +0100
> 
> > Here is how I fixed this, thanks again Jamie !
> > 
> > [PATCH] net: neighbour: pneigh_lookup() doesnt need RTNL
> 
> Eric, I don't think we can do this.
> 
> Fundamentally, any time a user operation changes the configuration
> of the networking, we must hold the RTNL.
> 
> Eliding the RTNL for lookups is fine, but for things that change
> state it is not.
> 
> I therefore think you'll need to rework the arp_ioctl() portions
> of the commit that introduced this regression.
> 

Hmm, I'll think about it, no problem.


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