[PATCH] clk/sprd: Hold reference returned by of_get_parent()

[Liang He <windhl@126.com>]

We should hold the reference returned by of_get_parent() and use it
to call of_node_out() for refcount balance.

Fixes: f95e8c7923d1 ("clk: sprd: support to get regmap from parent node")
Signed-off-by: Liang He <windhl@126.com>
---
 these bugs are found in 5.19rc2
 these bugs are confirmed not fixed by lore.kernel.org
 these bugs are compiled tested in 5.19rc2 with at91_dt_defconfig

 drivers/clk/sprd/common.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/clk/sprd/common.c b/drivers/clk/sprd/common.c
index d620bbbcdfc8..08c1d7a9ec8b 100644
--- a/drivers/clk/sprd/common.c
+++ b/drivers/clk/sprd/common.c
@@ -41,35 +41,41 @@ int sprd_clk_regmap_init(struct platform_device *pdev,
 {
 	void __iomem *base;
 	struct device *dev = &pdev->dev;
-	struct device_node *node = dev->of_node;
+	struct device_node *node = dev->of_node, *np;
 	struct regmap *regmap;
 
+	np = of_get_parent(dev->of_node);
 	if (of_find_property(node, "sprd,syscon", NULL)) {
 		regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
 		if (IS_ERR(regmap)) {
 			pr_err("%s: failed to get syscon regmap\n", __func__);
+			of_node_put(np);
 			return PTR_ERR(regmap);
 		}
-	} else if (of_device_is_compatible(of_get_parent(dev->of_node),
-			   "syscon")) {
-		regmap = device_node_to_regmap(of_get_parent(dev->of_node));
+	} else if (of_device_is_compatible(np, "syscon")) {
+		regmap = device_node_to_regmap(np);
 		if (IS_ERR(regmap)) {
+			of_node_put(np);
 			dev_err(dev, "failed to get regmap from its parent.\n");
 			return PTR_ERR(regmap);
 		}
 	} else {
 		base = devm_platform_ioremap_resource(pdev, 0);
-		if (IS_ERR(base))
+		if (IS_ERR(base)) {
+			of_node_put(np);
 			return PTR_ERR(base);
+		}
 
 		regmap = devm_regmap_init_mmio(&pdev->dev, base,
 					       &sprdclk_regmap_config);
 		if (IS_ERR(regmap)) {
+			of_node_put(np);
 			pr_err("failed to init regmap\n");
 			return PTR_ERR(regmap);
 		}
 	}
 
+	of_node_put(np);
 	sprd_clk_set_regmap(desc, regmap);
 
 	return 0;
-- 
2.25.1