linux-kernel - [PATCH 11/17] leds: mc13783: Use scoped device node handling to simplify error paths

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Message-Id: <20240816-cleanup-h-of-node-put-var-v1-11-1d0292802470@linaro.org>
Date: Fri, 16 Aug 2024 17:31:43 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, 
 Sean Wang <sean.wang@...iatek.com>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
 Riku Voipio <riku.voipio@....fi>, Orson Zhai <orsonzhai@...il.com>, 
 Baolin Wang <baolin.wang@...ux.alibaba.com>, 
 Chunyan Zhang <zhang.lyra@...il.com>, 
 Marek Behún <kabel@...nel.org>
Cc: linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 11/17] leds: mc13783: 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/leds/leds-mc13783.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c
index bbd1d359bba4..da99d114bfb2 100644
--- a/drivers/leds/leds-mc13783.c
+++ b/drivers/leds/leds-mc13783.c
@@ -12,6 +12,7 @@
  *      Eric Miao <eric.miao@...vell.com>
  */
 
+#include <linux/cleanup.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
@@ -113,7 +114,7 @@ static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 {
 	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
 	struct mc13xxx_leds_platform_data *pdata;
-	struct device_node *parent, *child;
+	struct device_node *child;
 	struct device *dev = &pdev->dev;
 	int i = 0, ret = -ENODATA;
 
@@ -121,24 +122,23 @@ static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 	if (!pdata)
 		return ERR_PTR(-ENOMEM);
 
-	parent = of_get_child_by_name(dev_of_node(dev->parent), "leds");
+	struct device_node *parent __free(device_node) =
+		of_get_child_by_name(dev_of_node(dev->parent), "leds");
 	if (!parent)
-		goto out_node_put;
+		return ERR_PTR(-ENODATA);
 
 	ret = of_property_read_u32_array(parent, "led-control",
 					 pdata->led_control,
 					 leds->devtype->num_regs);
 	if (ret)
-		goto out_node_put;
+		return ERR_PTR(ret);
 
 	pdata->num_leds = of_get_available_child_count(parent);
 
 	pdata->led = devm_kcalloc(dev, pdata->num_leds, sizeof(*pdata->led),
 				  GFP_KERNEL);
-	if (!pdata->led) {
-		ret = -ENOMEM;
-		goto out_node_put;
-	}
+	if (!pdata->led)
+		return ERR_PTR(-ENOMEM);
 
 	for_each_available_child_of_node(parent, child) {
 		const char *str;
@@ -158,12 +158,10 @@ static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
 	}
 
 	pdata->num_leds = i;
-	ret = i > 0 ? 0 : -ENODATA;
+	if (i <= 0)
+		return ERR_PTR(-ENODATA);
 
-out_node_put:
-	of_node_put(parent);
-
-	return ret ? ERR_PTR(ret) : pdata;
+	return pdata;
 }
 #else
 static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(

-- 
2.43.0