From 11f1a7768cb9179b1f1ce6b8027df7531e0704e7 Mon Sep 17 00:00:00 2001
From: Joerg Roedel <joro@8bytes.org>
Date: Tue, 25 Mar 2014 20:16:40 +0100
Subject: [PATCH] iommu/vt-d: Check for NULL pointer in
 dmar_acpi_dev_scope_init()

When ir_dev_scope_init() is called via a rootfs initcall it
will check for irq_remapping_enabled before it calls
(indirectly) into dmar_acpi_dev_scope_init() which uses the
dmar_tbl pointer without any checks.

The AMD IOMMU driver also sets the irq_remapping_enabled
flag which causes the dmar_acpi_dev_scope_init() function to
be called on systems with AMD IOMMU hardware too, causing a
boot-time kernel crash.

Signed-off-by: Joerg Roedel <joro@8bytes.org>
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