Re: 2.6.38-rc1: arp triggers RTNL assertion
From: David Miller
Date: Mon Jan 24 2011 - 16:13:31 EST
From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Date: Mon, 24 Jan 2011 22:11:38 +0100
> Le vendredi 21 janvier 2011 à 13:06 -0800, David Miller a écrit :
>> From: Eric Dumazet <eric.dumazet@xxxxxxxxx>
>> 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.
> Here is a second try of the fix, thanks !
> Note : Tested with CONFIG_PROVE_RCU=y
> [PATCH] net: arp_ioctl() must hold RTNL
Thanks Eric, this one looks a lot better. I'll apply this later
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