netdev - Re: mac80211 truesize bugs

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Message-Id: <1209917006.3753.2.camel@johannes.berg>
Date:	Sun, 04 May 2008 18:03:26 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	David Miller <davem@...emloft.net>, mb@...sch.de,
	netdev@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: mac80211 truesize bugs

On Sun, 2008-05-04 at 16:06 +0200, Johannes Berg wrote:
> > There are three ways out of this.  You could have your own cache
> > (I haven't looked at your headers so I don't know whether that
> > makes sense), have no cache at all, or add a new field that gets
> > added to hard_header_len for the purposes of calculating head
> > room.
> 
> I tried the last option, patch below, didn't quite work out yet, but I
> got:
> 
> [  256.241496] KERNEL: assertion (!atomic_read(&sk->sk_wmem_alloc))
> failed at net/packet/af_packet.c (225)

Except for that, the patch works fine with mac80211 setting the new
netdev fields. I still get lots of reallocations though because I get a
lot of cloned packets, not sure why.

johannes

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