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

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Date:	Fri, 21 Jan 2011 13:06:57 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	jamie@...ible.transient.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: 2.6.38-rc1: arp triggers RTNL assertion

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.

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