From: David Woodhouse <David.Woodhouse@intel.com>
Date: Sat, 11 Apr 2009 05:27:48 +0000 (-0700)
Subject: intel-iommu: Avoid panic() for DRHD at address zero.
X-Git-Tag: v2.6.30-rc2~73^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=e523b38e2f568af58baa13120a994cbf24e6dee0;p=pandora-kernel.git

intel-iommu: Avoid panic() for DRHD at address zero.

If the BIOS does something obviously stupid, like claiming that the
registers for the IOMMU are at physical address zero, then print a nasty
message and abort, rather than trying to set up the IOMMU and then later
panicking.

It's becoming more and more obvious that trusting this stuff to the BIOS
was a mistake.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
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