From a8c485bb6857811807d42f9fd1fde2f5f89cc5c9 Mon Sep 17 00:00:00 2001
From: Chris Wright <chrisw@sous-sol.org>
Date: Mon, 15 Jun 2009 15:53:45 +0200
Subject: [PATCH] amd-iommu: disable cmd buffer and evt logging before
 reprogramming iommu

The IOMMU spec states that IOMMU behavior may be undefined when the
IOMMU registers are rewritten while command or event buffer is enabled.
Disable them in IOMMU disable path.

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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