iommu/amd: Make sure IOMMU is not considered to translate itself

The IVRS table usually includes the IOMMU device. But the
IOMMU does never translate itself, so make sure the IOMMU
driver knows this.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

drivers/iommu/amd_iommu_init.c

@@ -1021,6 +1021,13 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
 	ret = init_iommu_from_acpi(iommu, h);
 	if (ret)
 		return ret;
+
+	/*
+	 * Make sure IOMMU is not considered to translate itself. The IVRS
+	 * table tells us so, but this is a lie!
+	 */
+	amd_iommu_rlookup_table[iommu->devid] = NULL;
+
 	init_iommu_devices(iommu);
 
 	return 0;