linux-kernel - [PATCH] AMD IOMMU: initialize IOMMU when GART is detected

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Date:	Mon, 7 Jul 2008 16:42:50 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	mingo@...hat.com, tglx@...utronix.de
CC:	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	Joerg Roedel <joerg.roedel@....com>
Subject: [PATCH] AMD IOMMU: initialize IOMMU when GART is detected

One of the last IOMMU updates covered a bug in the AMD IOMMU code. The early
detection code does not succeed if the GART is already detected. This patch
fixes this by removing the check for iommu_detected in the early detect code.
On AMD systems only the GART code sets this variable to one beside the AMD
IOMMU driver.

Signed-off-by: Joerg Roedel <joerg.roedel@....com>
---
 arch/x86/kernel/amd_iommu_init.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 2a13e43..71e13af 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -828,7 +828,7 @@ static int __init early_amd_iommu_detect(struct acpi_table_header *table)
 
 void __init amd_iommu_detect(void)
 {
-	if (swiotlb || no_iommu || iommu_detected)
+	if (swiotlb || no_iommu)
 		return;
 
 	if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
-- 
1.5.3.7


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