intel-iommu: Fix oops in device_to_iommu() when devices not found.
It's possible for a device in the drhd->devices[] array to be NULL if
it wasn't found at boot time, which means we have to check for that
case.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index fd7472f..dcda521 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -485,7 +485,8 @@
drhd->devices[i]->bus->number == bus &&
drhd->devices[i]->devfn == devfn)
return drhd->iommu;
- if (drhd->devices[i]->subordinate &&
+ if (drhd->devices[i] &&
+ drhd->devices[i]->subordinate &&
drhd->devices[i]->subordinate->number <= bus &&
drhd->devices[i]->subordinate->subordinate >= bus)
return drhd->iommu;