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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] net: Fix IP_MULTICAST_IF
Date: Mon, 19 Oct 2009 21:21:07 -0700 (PDT)
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From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 20 Oct 2009 06:16:02 +0200

> BTW, even an insertion can crash a lockless reader, since reader
>  could see a corrupt n->next (hlist_add_head() has no barrier
>  between n->next = first and h->first = n;)

Ok, now that convinces it for me, I'll apply your patch, thanks!