diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 220e437..4d9aaf9 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1625,8 +1625,7 @@
 		goto err3;
 	}
 
-	sm->regs = ioremap(pci_resource_start(dev, 1),
-			   pci_resource_len(dev, 1));
+	sm->regs = pci_ioremap_bar(dev, 1);
 
 	if (sm->regs == NULL) {
 		dev_err(&dev->dev, "cannot remap registers\n");