cpuidle: big.LITTLE: fix refcount leak

TinyWindzz · rafaeljw · commit 9456823c842f · 2018-12-11T12:09:48.000+01:00
of_find_node_by_path() acquires a reference to the node
returned by it and that reference needs to be dropped by its caller.
bl_idle_init() doesn't do that, so fix it.

Signed-off-by: Yangtao Li &lt;tiny.windzz@gmail.com&gt;
Acked-by: Daniel Lezcano &lt;daniel.lezcano@linaro.org&gt;
Signed-off-by: Rafael J. Wysocki &lt;rafael.j.wysocki@intel.com&gt;
diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
@@ -167,14 +167,19 @@ static int __init bl_idle_init(void)
 {
 	int ret;
 	struct device_node *root = of_find_node_by_path("/");
+	const struct of_device_id *match_id;
 
 	if (!root)
 		return -ENODEV;
 
 	/*
 	 * Initialize the driver just for a compliant set of machines
 	 */
-	if (!of_match_node(compatible_machine_match, root))
+	match_id = of_match_node(compatible_machine_match, root);
+
+	of_node_put(root);
+
+	if (!match_id)
 		return -ENODEV;
 
 	if (!mcpm_is_available())
