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From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH net-next v2 2/6] 6lowpan: fix fragmentation on sending
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Date: Mon, 24 Feb 2014 20:31:38 -0500 (EST)
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From: Alexander Aring <alex.aring@gmail.com>
Date: Tue, 25 Feb 2014 02:21:57 +0100

> In this case I can be sure we talking with ARPHRD_IEEE802154 devices only.

This doesn't mean anything.

The qdisc layer can be involved no matter what.  Once you call
dev_queue_xmit(), all bets are off wrt. the SKB control block.
It is not your's to use past that point.