linux-kernel - Re: [RFC][PATCH 2/9] deadlock prevention core

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Message-Id: <20060808.183920.41636471.davem@davemloft.net>
Date:	Tue, 08 Aug 2006 18:39:20 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	phillips@...gle.com
Cc:	tgraf@...g.ch, a.p.zijlstra@...llo.nl, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [RFC][PATCH 2/9] deadlock prevention core

From: Daniel Phillips <phillips@...gle.com>
Date: Tue, 08 Aug 2006 18:34:43 -0700

> Can you please characterize the conditions under which skb->dev changes
> after the alloc?  Are there writings on this subtlety?

The packet scheduler and classifier can redirect packets to different
devices, and can the netfilter layer.

The setting of skb->dev is wholly transient and you cannot rely upon
it to be the same as when you set it on allocation.

Even simple things like the bonding device change skb->dev on every
receive.

I think you need to study the networking stack a little more before
you continue to play in this delicate area :-)
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