netdev - Re: [PATCH] Fix up truesize after pskb_expand

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Message-ID: <20090104174339.GX496@one.firstfloor.org>
Date:	Sun, 4 Jan 2009 18:43:39 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Johannes Berg <johannes@...solutions.net>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org, linville@...driver.com,
	davem <davem@...emloft.net>
Subject: Re: [PATCH] Fix up truesize after pskb_expand_head() in wireless stack

On Sun, Jan 04, 2009 at 05:41:28PM +0100, Johannes Berg wrote:
> On Sun, 2009-01-04 at 17:28 +0100, Andi Kleen wrote:
> > > Thanks, but I'll need to look at this in more detail, we need to make
> > > sure that we orphan the skb before 
> > 
> > What do you mean with orphaning the skb? 
> 
> Well, touching truesize is absolutely not allowed while the skb is
> charged to a socket. This is what causes the truesize warning. The thing

The cause of the warnings was because the skb changed, but
truesize didn't.

> we need to do is figure out is why the skb has a wrong truesize.

Because it was expanded without truesize being adjusted (see my
original mail) 

-Andi
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