1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 66665c82415c..eec684a8e44e 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -504,6 +504,12 @@ static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
                         break;
         }
 
+        if (!pdn || !PCI_DN(pdn)) {
+                printk(KERN_WARNING "pci_dma_dev_setup_pSeriesLP: "
+                       "no DMA window found for pci dev=%s dn=%s\n",
+                                 pci_name(dev), dn? dn->full_name : "<null>");
+                return;
+        }
         DBG("  parent is %s\n", pdn->full_name);
 
         /* Check for parent == NULL so we don't try to setup the empty EADS