diff --git a/drivers/pci/hotplug/ibmphp_ebda.c b/drivers/pci/hotplug/ibmphp_ebda.c
index 7d3bf31d224d90956f1e3c5d908557585dffc7c9..5becbdee4027019a5c584df5ff5fb3cc99b04cc3 100644
--- a/drivers/pci/hotplug/ibmphp_ebda.c
+++ b/drivers/pci/hotplug/ibmphp_ebda.c
@@ -261,6 +261,8 @@ int __init ibmphp_access_ebda (void)
 	debug ("returned ebda segment: %x\n", ebda_seg);
 	
 	io_mem = ioremap(ebda_seg<<4, 1);
+	if (!io_mem)
+		return -ENOMEM;
 	ebda_sz = readb(io_mem);
 	iounmap(io_mem);
 	debug("ebda size: %d(KiB)\n", ebda_sz);