Merge branch 'sched/for-linus' into tracing/for-linus

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / amd_iommu_init.c

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index c54c82305af41db901c7be9ceccd4c991deea598..2a13e430437dc5f1e05793aa995df4befcbc8938 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -101,6 +101,8 @@ struct ivmd_header {
        u64 range_length;
 } __attribute__((packed));
 
+static int __initdata amd_iommu_detected;
+
 u16 amd_iommu_last_bdf;
 struct list_head amd_iommu_unity_map;
 unsigned amd_iommu_aperture_order = 26;
@@ -167,14 +169,11 @@ static void __init iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
 
 void __init iommu_enable(struct amd_iommu *iommu)
 {
-       u32 ctrl;
-
        printk(KERN_INFO "AMD IOMMU: Enabling IOMMU at ");
        print_devid(iommu->devid, 0);
        printk(" cap 0x%hx\n", iommu->cap_ptr);
 
        iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
-       ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
 }
 
 static u8 * __init iommu_map_mmio_space(u64 address)
@@ -689,6 +688,9 @@ int __init amd_iommu_init(void)
                return 0;
        }
 
+       if (!amd_iommu_detected)
+               return -ENODEV;
+
        /*
         * First parse ACPI tables to find the largest Bus/Dev/Func
         * we need to handle. Upon this information the shared data
@@ -831,6 +833,7 @@ void __init amd_iommu_detect(void)
 
        if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
                iommu_detected = 1;
+               amd_iommu_detected = 1;
 #ifdef CONFIG_GART_IOMMU
                gart_iommu_aperture_disabled = 1;
                gart_iommu_aperture = 0;