diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 1e5f083cdb72..5e00a3cde93b 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -781,8 +781,16 @@ static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
 	 * parent bus. During reboot, there will be ibm,dma-window property to
 	 * define DMA window. For kdump, there will at least be default window or DDW
 	 * or both.
+	 * There is an exception to the above. In case the PE goes into frozen
+	 * state, firmware may not provide ibm,dma-window property at the time
+	 * of LPAR boot up.
 	 */
 
+	if (!pdn) {
+		pr_debug("  no ibm,dma-window property !\n");
+		return;
+	}
+
 	ppci = PCI_DN(pdn);
 
 	pr_debug("  parent is %pOF, iommu_table: 0x%p\n",