linux-kernel - [PATCH] cpufreq: Use of_property

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Message-ID: <20240731191312.1710417-2-robh@kernel.org>
Date: Wed, 31 Jul 2024 13:12:40 -0600
From: "Rob Herring (Arm)" <robh@...nel.org>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Nicholas Piggin <npiggin@...il.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Naveen N Rao <naveen@...nel.org>,
	Patrice Chotard <patrice.chotard@...s.st.com>,
	Yangtao Li <tiny.windzz@...il.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>
Cc: linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-sunxi@...ts.linux.dev
Subject: [PATCH] cpufreq: Use of_property_present()

Use of_property_present() to test for property presence rather than
of_(find|get)_property(). 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/cpufreq-dt.c           | 11 +++--------
 drivers/cpufreq/pmac64-cpufreq.c       |  2 +-
 drivers/cpufreq/sti-cpufreq.c          |  2 +-
 drivers/cpufreq/sun50i-cpufreq-nvmem.c |  2 +-
 4 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 6532c4d71338..983443396f8f 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -69,7 +69,6 @@ static int set_target(struct cpufreq_policy *policy, unsigned int index)
 static const char *find_supply_name(struct device *dev)
 {
 	struct device_node *np __free(device_node) = of_node_get(dev->of_node);
-	struct property *pp;
 	int cpu = dev->id;
 
 	/* This must be valid for sure */
@@ -77,14 +76,10 @@ static const char *find_supply_name(struct device *dev)
 		return NULL;
 
 	/* Try "cpu0" for older DTs */
-	if (!cpu) {
-		pp = of_find_property(np, "cpu0-supply", NULL);
-		if (pp)
-			return "cpu0";
-	}
+	if (!cpu && of_property_present(np, "cpu0-supply"))
+		return "cpu0";
 
-	pp = of_find_property(np, "cpu-supply", NULL);
-	if (pp)
+	if (of_property_present(np, "cpu-supply"))
 		return "cpu";
 
 	dev_dbg(dev, "no regulator for cpu%d\n", cpu);
diff --git a/drivers/cpufreq/pmac64-cpufreq.c b/drivers/cpufreq/pmac64-cpufreq.c
index 2cd2b06849a2..c87cd6e0b638 100644
--- a/drivers/cpufreq/pmac64-cpufreq.c
+++ b/drivers/cpufreq/pmac64-cpufreq.c
@@ -505,7 +505,7 @@ static int __init g5_pm72_cpufreq_init(struct device_node *cpunode)
 			continue;
 		if (strcmp(loc, "CPU CLOCK"))
 			continue;
-		if (!of_get_property(hwclock, "platform-get-frequency", NULL))
+		if (!of_property_present(hwclock, "platform-get-frequency"))
 			continue;
 		break;
 	}
diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpufreq.c
index 8e2e703c3865..b15b3142b5fe 100644
--- a/drivers/cpufreq/sti-cpufreq.c
+++ b/drivers/cpufreq/sti-cpufreq.c
@@ -267,7 +267,7 @@ static int __init sti_cpufreq_init(void)
 		goto skip_voltage_scaling;
 	}
 
-	if (!of_get_property(ddata.cpu->of_node, "operating-points-v2", NULL)) {
+	if (!of_property_present(ddata.cpu->of_node, "operating-points-v2")) {
 		dev_err(ddata.cpu, "OPP-v2 not supported\n");
 		goto skip_voltage_scaling;
 	}
diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
index 95ac8d46c156..293921acec93 100644
--- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
+++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
@@ -146,7 +146,7 @@ static bool dt_has_supported_hw(void)
 		return false;
 
 	for_each_child_of_node_scoped(np, opp) {
-		if (of_find_property(opp, "opp-supported-hw", NULL)) {
+		if (of_property_present(opp, "opp-supported-hw")) {
 			has_opp_supported_hw = true;
 			break;
 		}
-- 
2.43.0