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Subject[147/151] intel-iommu: Fix oops with intel_iommu=igfx_off
2.6.32-stable review patch.  If anyone has any objections, please let us know.


From: David Woodhouse <>

commit 44cd613c0e4cd93079ea2a93aa06649d8ca0830a upstream.

The hotplug notifier will call find_domain() to see if the device in
question has been assigned an IOMMU domain. However, this should never
be called for devices with a "dummy" domain, such as graphics devices
when intel_iommu=igfx_off is set and the corresponding IOMMU isn't even
initialised. If you do that, it'll oops as it dereferences the (-1)

The notifier function should check iommu_no_mapping() for the
device before doing anything else.

Signed-off-by: David Woodhouse <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/pci/intel-iommu.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -3238,6 +3238,9 @@ static int device_notifier(struct notifi
struct pci_dev *pdev = to_pci_dev(dev);
struct dmar_domain *domain;

+ if (iommu_no_mapping(dev))
+ return 0;
domain = find_domain(pdev);
if (!domain)
return 0;

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