diff --git a/drivers/clk/st/clk-flexgen.c b/drivers/clk/st/clk-flexgen.c
index a485f3b284b9..918ba3164da9 100644
--- a/drivers/clk/st/clk-flexgen.c
+++ b/drivers/clk/st/clk-flexgen.c
@@ -329,8 +329,10 @@ static void __init st_of_flexgen_setup(struct device_node *np)
 		return;
 
 	parents = flexgen_get_parents(np, &num_parents);
-	if (!parents)
+	if (!parents) {
+		iounmap(reg);
 		return;
+	}
 
 	match = of_match_node(flexgen_of_match, np);
 	if (match) {
@@ -394,6 +396,7 @@ static void __init st_of_flexgen_setup(struct device_node *np)
 	return;
 
 err:
+	iounmap(reg);
 	if (clk_data)
 		kfree(clk_data->clks);
 	kfree(clk_data);