netdev - Re: [PATCH net-next] tcp: fix loop in ofo handling code and reduce its complexity

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Date:	Fri, 29 May 2009 15:02:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp: fix loop in ofo handling code and reduce
 its complexity

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Fri, 29 May 2009 16:03:45 +0300 (EEST)

> Somewhat luckily, I was looking into these parts with very fine
> comb because I've made somewhat similar changes on the same
> area (conflicts that arose weren't that lucky though). The loop
> was very much overengineered recently in commit 915219441d566
> (tcp: Use SKB queue and list helpers instead of doing it
> by-hand), while it basically just wants to know if there are
> skbs after 'skb'.
> 
> Also it got broken because skb1 = skb->next got translated into
> skb1 = skb1->next (though abstracted) improperly. Note that
> 'skb1' is pointing to previous sk_buff than skb or NULL if at
> head. Two things went wrong:
> - We'll kfree 'skb' on the first iteration instead of the
>   skbuff following 'skb' (it would require required SACK reneging
>   to recover I think).
> - The list head case where 'skb1' is NULL is checked too early
>   and the loop won't execute whereas it previously did.
> 
> Conclusion, mostly revert the recent changes which makes the
> cset very messy looking but using proper accessor in the
> previous-like version.
> 
> The effective changes against the original can be viewed with:
>   git-diff 915219441d566f1da0caa0e262be49b666159e17^ \
> 		net/ipv4/tcp_input.c | sed -n -e '57,70 p'
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

Applied, thanks a lot for catching this!
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