diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c
index 061cdb8bde8b55a7c0b5f0c7ed94b1c662f51644..d2306c821ebb594398d102433dcc66efcb2bf573 100644
--- a/drivers/irqchip/irq-mbigen.c
+++ b/drivers/irqchip/irq-mbigen.c
@@ -337,8 +337,7 @@ static int mbigen_device_probe(struct platform_device *pdev)
 	mgn_chip->pdev = pdev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	mgn_chip->base = devm_ioremap(&pdev->dev, res->start,
-				      resource_size(res));
+	mgn_chip->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(mgn_chip->base))
 		return PTR_ERR(mgn_chip->base);