netdev - Re: [net-2.6 PATCH 4/4] ixgbe: fix unmap length bug

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Date:	Tue, 30 Jun 2009 19:50:48 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, stable@...nel.org,
	jesse.brandeburg@...el.com, joerg.roedel@....com
Subject: Re: [net-2.6 PATCH 4/4] ixgbe: fix unmap length bug

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 30 Jun 2009 14:44:56 -0700

> From: Jesse Brandeburg <jesse.brandeburg@...el.com>
> 
> This patch addresses three WARN_ON statements from DMA-API debug code
> 
> ixgbe is mapping more than it unmaps, reduce the length of the map call and
> remove the "used once" local variable.
> 
> found by Joerg Roedel <joerg.roedel@....com> in 2.6.30, so is a candidate
> for -stable.
> 
> in addition, fix missing ->dma = 0 after unmap to prevent double free with
> pci_unmap_single
> 
> and lastly, don't unmap (half) pages that aren't mapped.
> 
> Signed-off-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
> CC: Joerg Roedel <joerg.roedel@....com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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