FAILED: patch "[PATCH] PM / devfreq: exynos-ppmu: Fix refcount leak in" failed to apply to 4.19-stable tree

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From f44b799603a9b5d2e375b0b2d54dd0b791eddfc2 Mon Sep 17 00:00:00 2001
From: Miaoqian Lin <[email protected]>
Date: Thu, 26 May 2022 12:28:56 +0400
Subject: [PATCH] PM / devfreq: exynos-ppmu: Fix refcount leak in
of_get_devfreq_events

of_get_child_by_name() returns a node pointer with refcount incremented, we should use of_node_put() on it when done. This function only calls of_node_put() in normal path, missing it in error paths.
Add missing of_node_put() to avoid refcount leak.

index 9b849d781116..a443e7c42daf 100644
@@ -519,15 +519,19 @@ static int of_get_devfreq_events(struct device_node *np,
 
 	count = of_get_child_count(events_np);
 	desc = devm_kcalloc(dev, count, sizeof(*desc), GFP_KERNEL);
-	if (!desc)
+	if (!desc) {
+		of_node_put(events_np);
 		return -ENOMEM;
+	}
 	info->num_events = count;
 
 	of_id = of_match_device(exynos_ppmu_id_match, dev);
 	if (of_id)
 		info->ppmu_type = (enum exynos_ppmu_type)of_id->data;
-	else
+	else {
+		of_node_put(events_np);
 		return -EINVAL;
+	}
 
 	j = 0;
 	for_each_child_of_node(events_np, node) {