linux-kernel - [PATCH 2/2] cpufreq: sun50i: replace of_node

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Date: Fri, 03 May 2024 19:52:33 +0200
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Yangtao Li <tiny.windzz@...il.com>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Viresh Kumar <viresh.kumar@...aro.org>, Chen-Yu Tsai <wens@...e.org>, 
 Jernej Skrabec <jernej.skrabec@...il.com>, 
 Samuel Holland <samuel@...lland.org>, 
 Andre Przywara <andre.przywara@....com>, 
 Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: [PATCH 2/2] cpufreq: sun50i: replace of_node_put() with automatic
 cleanup handler

Make use of the __free() cleanup handler to automatically free nodes
when they get out of scope.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/cpufreq/sun50i-cpufreq-nvmem.c | 25 ++++++++-----------------
 1 file changed, 8 insertions(+), 17 deletions(-)

diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index ef83e4bf2639..eb47c193269c 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -131,14 +131,14 @@ static const struct of_device_id cpu_opp_match_list[] = {
 static bool dt_has_supported_hw(void)
 {
 	bool has_opp_supported_hw = false;
-	struct device_node *np;
 	struct device *cpu_dev;
 
 	cpu_dev = get_cpu_device(0);
 	if (!cpu_dev)
 		return false;
 
-	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
+	struct device_node *np __free(device_node) =
+		dev_pm_opp_of_get_opp_desc_node(cpu_dev);
 	if (!np)
 		return false;
 
@@ -149,8 +149,6 @@ static bool dt_has_supported_hw(void)
 		}
 	}
 
-	of_node_put(np);
-
 	return has_opp_supported_hw;
 }
 
@@ -165,7 +163,6 @@ static int sun50i_cpufreq_get_efuse(void)
 	const struct sunxi_cpufreq_data *opp_data;
 	struct nvmem_cell *speedbin_nvmem;
 	const struct of_device_id *match;
-	struct device_node *np;
 	struct device *cpu_dev;
 	u32 *speedbin;
 	int ret;
@@ -174,19 +171,18 @@ static int sun50i_cpufreq_get_efuse(void)
 	if (!cpu_dev)
 		return -ENODEV;
 
-	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
+	struct device_node *np __free(device_node) =
+		dev_pm_opp_of_get_opp_desc_node(cpu_dev);
 	if (!np)
 		return -ENOENT;
 
 	match = of_match_node(cpu_opp_match_list, np);
-	if (!match) {
-		of_node_put(np);
+	if (!match)
 		return -ENOENT;
-	}
+
 	opp_data = match->data;
 
 	speedbin_nvmem = of_nvmem_cell_get(np, NULL);
-	of_node_put(np);
 	if (IS_ERR(speedbin_nvmem))
 		return dev_err_probe(cpu_dev, PTR_ERR(speedbin_nvmem),
 				     "Could not get nvmem cell\n");
@@ -301,14 +297,9 @@ MODULE_DEVICE_TABLE(of, sun50i_cpufreq_match_list);
 
 static const struct of_device_id *sun50i_cpufreq_match_node(void)
 {
-	const struct of_device_id *match;
-	struct device_node *np;
-
-	np = of_find_node_by_path("/");
-	match = of_match_node(sun50i_cpufreq_match_list, np);
-	of_node_put(np);
+	struct device_node *np __free(device_node) = of_find_node_by_path("/");
 
-	return match;
+	return of_match_node(sun50i_cpufreq_match_list, np);
 }
 
 /*

-- 
2.40.1