From: Ben Hutchings <[email protected]>
Date: Fri, 11 May 2012 04:00:15 +0100

> On Wed, 2012-05-09 at 03:16 -0500, Jonathan Nieder wrote:
>> Ben Hutchings wrote:
>> 
>> > 3.2-stable review patch.  If anyone has any objections, please let me know.
>> [...]
>> > [ Upstream commit 4fa48bf3c75069d636fc8830743c929a062e80dc ]
>> >
>> > commit f07d960df3 (tcp: avoid frag allocation for small frames)
>> > breaked assumption in tcp stack that skb is either linear (skb->data_len
>> > == 0), or fully fragged (skb->data_len == skb->len)
>> >
>> > tcp_trim_head() made this assumption, we must fix it.
>> 
>> Is this needed in the context of 3.2.y (which does not include
>> f07d960df3)?
> [...]
> 
> The code being replaced really didn't make sense, but unless there is
> some other case that breaks the assumption described then I don't think
> this meets the stable rules.  David?

It's a prerequisite for cleanly applying the patch that comes right
afterwards.
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