From 23e55a32ca1ffdbe7a492ef99f0e0ac48e504a13 Mon Sep 17 00:00:00 2001
From: "Brandeburg, Jesse" <jesse.brandeburg@intel.com>
Date: Tue, 30 Sep 2008 13:08:48 +0000
Subject: [PATCH] ixgb: fix bug when freeing resources

It was pointed out by Breno Leitao <leitao@linux.vnet.ibm.com> that
ixgb would crash on PPC when an IOMMU was in use, if change_mtu was
called.

It appears to be a pretty simple issue in the driver that wasn't discovered
because most systems don't run with an IOMMU.  The driver needs to only unmap
buffers that are mapped (duh).

CC: Breno Leitao <leitao@linux.vnet.ibm.com>

Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
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