linux-kernel - [PATCH 3/7] regulator: max8997: Use scoped device node handling to simplify error paths

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Message-Id: <20240814-cleanup-h-of-node-put-regulator-v1-3-87151088b883@linaro.org>
Date: Wed, 14 Aug 2024 17:04:07 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Matti Vaittinen <mazziesaccount@...il.com>, 
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Krzysztof Kozlowski <krzk@...nel.org>, Sudeep Holla <sudeep.holla@....com>, 
 Cristian Marussi <cristian.marussi@....com>
Cc: linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, arm-scmi@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 3/7] regulator: max8997: Use scoped device node handling to
 simplify error paths

Obtain the device node reference with scoped/cleanup.h to reduce error
handling and make the code a bit simpler.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/regulator/max8997-regulator.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/regulator/max8997-regulator.c b/drivers/regulator/max8997-regulator.c
index cdbfb4561dd8..e77621b6466c 100644
--- a/drivers/regulator/max8997-regulator.c
+++ b/drivers/regulator/max8997-regulator.c
@@ -8,6 +8,7 @@
 // This driver is based on max8998.c
 
 #include <linux/bug.h>
+#include <linux/cleanup.h>
 #include <linux/err.h>
 #include <linux/gpio/consumer.h>
 #include <linux/slab.h>
@@ -876,7 +877,7 @@ static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 					struct max8997_platform_data *pdata)
 {
 	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
-	struct device_node *pmic_np, *regulators_np, *reg_np;
+	struct device_node *pmic_np, *reg_np;
 	struct max8997_regulator_data *rdata;
 	unsigned int i, dvs_voltage_nr = 1;
 
@@ -886,7 +887,8 @@ static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 		return -ENODEV;
 	}
 
-	regulators_np = of_get_child_by_name(pmic_np, "regulators");
+	struct device_node *regulators_np __free(device_node) = of_get_child_by_name(pmic_np,
+										     "regulators");
 	if (!regulators_np) {
 		dev_err(&pdev->dev, "could not find regulators sub-node\n");
 		return -EINVAL;
@@ -898,10 +900,8 @@ static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 	rdata = devm_kcalloc(&pdev->dev,
 			     pdata->num_regulators, sizeof(*rdata),
 			     GFP_KERNEL);
-	if (!rdata) {
-		of_node_put(regulators_np);
+	if (!rdata)
 		return -ENOMEM;
-	}
 
 	pdata->regulators = rdata;
 	for_each_child_of_node(regulators_np, reg_np) {
@@ -922,7 +922,6 @@ static int max8997_pmic_dt_parse_pdata(struct platform_device *pdev,
 		rdata->reg_node = reg_np;
 		rdata++;
 	}
-	of_node_put(regulators_np);
 
 	pdata->buck1_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs");
 	pdata->buck2_gpiodvs = of_property_read_bool(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs");

-- 
2.43.0