From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Cochran <richardcochran@gmail.com>
Subject: Re: [PATCH] gianfar: Fix invalid TX frames returned on error queue
 when time stamping.
Date: Mon, 9 Jan 2012 13:50:34 +0100
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Cc: Eric Dumazet <eric.dumazet@gmail.com>,
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On Mon, Jan 09, 2012 at 01:41:08PM +0100, Richard Cochran wrote:
> 
> 	if (((skb->ip_summed == CHECKSUM_PARTIAL) ||
>       	   		vlan_tx_tag_present(skb) ||
> 			unlikely(do_tstamp)) &&
> 			(skb_headroom(skb) < GMAC_FCB_LEN)) {
> 		struct sk_buff *skb_new;
> 		...
> 	}
> 
> IOW, there was always at least GMAC_FCB_LEN bytes in skb_headroom.

And now, you are asking for more space.

Richard