linux-kernel - [PATCH 5.4 124/255] clk: oxnas: Hold reference returned by of_get

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Date:   Mon, 24 Oct 2022 13:30:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Liang He <windhl@....com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 124/255] clk: oxnas: Hold reference returned by of_get_parent()

From: Liang He <windhl@....com>

[ Upstream commit 1d6aa08c54cd0e005210ab8e3b1e92ede70f8a4f ]

In oxnas_stdclk_probe(), we need to hold the reference returned by
of_get_parent() and use it to call of_node_put() for refcount
balance.

Fixes: 0bbd72b4c64f ("clk: Add Oxford Semiconductor OXNAS Standard Clocks")
Signed-off-by: Liang He <windhl@....com>
Link: https://lore.kernel.org/r/20220628143155.170550-1-windhl@126.com
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/clk-oxnas.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-oxnas.c b/drivers/clk/clk-oxnas.c
index 78d5ea669fea..2fe36f579ac5 100644
--- a/drivers/clk/clk-oxnas.c
+++ b/drivers/clk/clk-oxnas.c
@@ -207,7 +207,7 @@ static const struct of_device_id oxnas_stdclk_dt_ids[] = {
 
 static int oxnas_stdclk_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device_node *np = pdev->dev.of_node, *parent_np;
 	const struct oxnas_stdclk_data *data;
 	const struct of_device_id *id;
 	struct regmap *regmap;
@@ -219,7 +219,9 @@ static int oxnas_stdclk_probe(struct platform_device *pdev)
 		return -ENODEV;
 	data = id->data;
 
-	regmap = syscon_node_to_regmap(of_get_parent(np));
+	parent_np = of_get_parent(np);
+	regmap = syscon_node_to_regmap(parent_np);
+	of_node_put(parent_np);
 	if (IS_ERR(regmap)) {
 		dev_err(&pdev->dev, "failed to have parent regmap\n");
 		return PTR_ERR(regmap);
-- 
2.35.1