From: Joerg Roedel <joerg.roedel@amd.com>
Date: Thu, 12 Apr 2012 12:12:00 +0000 (+0200)
Subject: iommu/amd: Add workaround for event log erratum
X-Git-Tag: v3.2.20~85
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=322a3fe8c915cdf512a510ad1bd359f8e0ed9a86;p=pandora-kernel.git

iommu/amd: Add workaround for event log erratum

commit 3d06fca8d2aa3543030e40b95f1d62f9f5a03540 upstream.

Due to a recent erratum it can happen that the head pointer
of the event-log is updated before the actual event-log
entry is written. This patch implements the recommended
workaround.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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