linux-kernel - [PATCH] cpufreq: spear: Use of_property_for_each

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Message-ID: <20240731201615.1841145-1-robh@kernel.org>
Date: Wed, 31 Jul 2024 14:16:15 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] cpufreq: spear: Use of_property_for_each_u32() instead of open coding

Use of_property_count_u32_elems() and of_property_for_each_u32() instead
of of_find_property() and open coding the property parsing.

This is part of a larger effort to remove callers of of_find_property()
and similar functions. of_find_property() leaks the DT struct property
and data pointers which is a problem for dynamically allocated nodes
which may be freed.

Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
 drivers/cpufreq/spear-cpufreq.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/cpufreq/spear-cpufreq.c b/drivers/cpufreq/spear-cpufreq.c
index 78b875db6b66..4d28147c23f1 100644
--- a/drivers/cpufreq/spear-cpufreq.c
+++ b/drivers/cpufreq/spear-cpufreq.c
@@ -171,9 +171,8 @@ static struct cpufreq_driver spear_cpufreq_driver = {
 static int spear_cpufreq_probe(struct platform_device *pdev)
 {
 	struct device_node *np;
-	const struct property *prop;
 	struct cpufreq_frequency_table *freq_tbl;
-	const __be32 *val;
+	u32 val;
 	int cnt, i, ret;
 
 	np = of_cpu_device_node_get(0);
@@ -186,26 +185,23 @@ static int spear_cpufreq_probe(struct platform_device *pdev)
 				&spear_cpufreq.transition_latency))
 		spear_cpufreq.transition_latency = CPUFREQ_ETERNAL;
 
-	prop = of_find_property(np, "cpufreq_tbl", NULL);
-	if (!prop || !prop->value) {
+	cnt = of_property_count_u32_elems(np, "cpufreq_tbl");
+	if (cnt <= 0) {
 		pr_err("Invalid cpufreq_tbl\n");
 		ret = -ENODEV;
 		goto out_put_node;
 	}
 
-	cnt = prop->length / sizeof(u32);
-	val = prop->value;
-
 	freq_tbl = kcalloc(cnt + 1, sizeof(*freq_tbl), GFP_KERNEL);
 	if (!freq_tbl) {
 		ret = -ENOMEM;
 		goto out_put_node;
 	}
 
-	for (i = 0; i < cnt; i++)
-		freq_tbl[i].frequency = be32_to_cpup(val++);
+	of_property_for_each_u32(np, "cpufreq_tbl", &val)
+		freq_tbl[i].frequency = val;
 
-	freq_tbl[i].frequency = CPUFREQ_TABLE_END;
+	freq_tbl[cnt].frequency = CPUFREQ_TABLE_END;
 
 	spear_cpufreq.freq_tbl = freq_tbl;
 
-- 
2.43.0