1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c
index 0c4ab3b07274..9b35259eecfa 100644
--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -745,7 +745,7 @@ static char *fault_reason_strings[] =
         "non-zero reserved fields in PTE",
         "Unknown"
 };
-#define MAX_FAULT_REASON_IDX    ARRAY_SIZE(fault_reason_strings)
+#define MAX_FAULT_REASON_IDX    ARRAY_SIZE(fault_reason_strings) - 1
 
 char *dmar_get_fault_reason(u8 fault_reason)
 {
@@ -995,7 +995,6 @@ static struct intel_iommu *alloc_iommu(struct dmar_drhd_unit *drhd)
         return iommu;
 error_unmap:
         iounmap(iommu->reg);
-        iommu->reg = 0;
 error:
         kfree(iommu);
         return NULL;
@@ -1808,7 +1807,7 @@ get_valid_domain_for_dev(struct pci_dev *pdev)
         if (!domain) {
                 printk(KERN_ERR
                         "Allocating domain for %s failed", pci_name(pdev));
-                return 0;
+                return NULL;
         }
 
         /* make sure context mapping is ok */
@@ -1818,7 +1817,7 @@ get_valid_domain_for_dev(struct pci_dev *pdev)
                         printk(KERN_ERR
                                 "Domain context map for %s failed",
                                 pci_name(pdev));
-                        return 0;
+                        return NULL;
                 }
         }