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Date:	Thu, 24 May 2012 16:21:17 -0400 (EDT)
From:	David Miller <>
Subject: Re: [PATCH] xen/netback: Calculate the number of SKB slots
 required correctly

From: Simon Graham <>
Date: Thu, 24 May 2012 12:26:07 -0400

> When calculating the number of slots required for a packet header, the code
> was reserving too many slots if the header crossed a page boundary. Since
> netbk_gop_skb copies the header to the start of the page, the count of
> slots required for the header should be based solely on the header size.
> This problem is easy to reproduce if a VIF is bridged to a USB 3G modem
> device as the skb->data value always starts near the end of the first page.
> Signed-off-by: Simon Graham <>

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