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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 <>
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)

if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {

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