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From: Lizhe <sensor1010@163.com>
To: rafael@kernel.org,
	viresh.kumar@linaro.org,
	marcan@marcan.st,
	sven@svenpeter.dev,
	alyssa@rosenzweig.io,
	mmayer@broadcom.com,
	bcm-kernel-feedback-list@broadcom.com
Cc: linux-pm@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	asahi@lists.linux.dev,
	linux-arm-kernel@lists.infradead.org,
	Lizhe <sensor1010@163.com>
Subject: [PATCH] cpufreq: Convert to exit callback returning void
Date: Tue,  9 Apr 2024 08:28:37 -0700
Message-Id: <20240409152837.5792-1-sensor1010@163.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

For the exit() callback function returning an int type value,
this leads many driver authors mistakenly believing that error
handling can be performed by returning an error code. However,
the returned value is ignored, and to improve this situation.
it is proposed to modify the return type of the exit() callback
function to void.

Signed-off-by: Lizhe <sensor1010@163.com>
---
 drivers/cpufreq/acpi-cpufreq.c      | 4 +---
 drivers/cpufreq/apple-soc-cpufreq.c | 4 +---
 drivers/cpufreq/bmips-cpufreq.c     | 4 +---
 drivers/cpufreq/cppc_cpufreq.c      | 3 +--
 drivers/cpufreq/cpufreq-dt.c        | 3 +--
 drivers/cpufreq/cpufreq-nforce2.c   | 6 ------
 drivers/cpufreq/e_powersaver.c      | 3 +--
 include/linux/cpufreq.h             | 2 +-
 8 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/drivers/cpufreq/acpi-cpufreq.c b/drivers/cpufreq/acpi-cpufreq.c
index 37f1cdf46d29..33f18140e9a4 100644
--- a/drivers/cpufreq/acpi-cpufreq.c
+++ b/drivers/cpufreq/acpi-cpufreq.c
@@ -906,7 +906,7 @@ static int acpi_cpufreq_cpu_init(struct cpufreq_policy *policy)
 	return result;
 }
 
-static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+static void acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 {
 	struct acpi_cpufreq_data *data = policy->driver_data;
 
@@ -919,8 +919,6 @@ static int acpi_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 	free_cpumask_var(data->freqdomain_cpus);
 	kfree(policy->freq_table);
 	kfree(data);
-
-	return 0;
 }
 
 static int acpi_cpufreq_resume(struct cpufreq_policy *policy)
diff --git a/drivers/cpufreq/apple-soc-cpufreq.c b/drivers/cpufreq/apple-soc-cpufreq.c
index 021f423705e1..af34c22fa273 100644
--- a/drivers/cpufreq/apple-soc-cpufreq.c
+++ b/drivers/cpufreq/apple-soc-cpufreq.c
@@ -305,7 +305,7 @@ static int apple_soc_cpufreq_init(struct cpufreq_policy *policy)
 	return ret;
 }
 
-static int apple_soc_cpufreq_exit(struct cpufreq_policy *policy)
+static void apple_soc_cpufreq_exit(struct cpufreq_policy *policy)
 {
 	struct apple_cpu_priv *priv = policy->driver_data;
 
@@ -313,8 +313,6 @@ static int apple_soc_cpufreq_exit(struct cpufreq_policy *policy)
 	dev_pm_opp_remove_all_dynamic(priv->cpu_dev);
 	iounmap(priv->reg_base);
 	kfree(priv);
-
-	return 0;
 }
 
 static struct cpufreq_driver apple_soc_cpufreq_driver = {
diff --git a/drivers/cpufreq/bmips-cpufreq.c b/drivers/cpufreq/bmips-cpufreq.c
index 39221a9a187a..17a4c174553d 100644
--- a/drivers/cpufreq/bmips-cpufreq.c
+++ b/drivers/cpufreq/bmips-cpufreq.c
@@ -121,11 +121,9 @@ static int bmips_cpufreq_target_index(struct cpufreq_policy *policy,
 	return 0;
 }
 
-static int bmips_cpufreq_exit(struct cpufreq_policy *policy)
+static void bmips_cpufreq_exit(struct cpufreq_policy *policy)
 {
 	kfree(policy->freq_table);
-
-	return 0;
 }
 
 static int bmips_cpufreq_init(struct cpufreq_policy *policy)
diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c
index 64420d9cfd1e..dccb9c1f087d 100644
--- a/drivers/cpufreq/cppc_cpufreq.c
+++ b/drivers/cpufreq/cppc_cpufreq.c
@@ -688,7 +688,7 @@ static int cppc_cpufreq_cpu_init(struct cpufreq_policy *policy)
 	return ret;
 }
 
-static int cppc_cpufreq_cpu_exit(struct cpufreq_policy *policy)
+static void cppc_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 {
 	struct cppc_cpudata *cpu_data = policy->driver_data;
 	struct cppc_perf_caps *caps = &cpu_data->perf_caps;
@@ -705,7 +705,6 @@ static int cppc_cpufreq_cpu_exit(struct cpufreq_policy *policy)
 			 caps->lowest_perf, cpu, ret);
 
 	cppc_cpufreq_put_cpu_data(policy);
-	return 0;
 }
 
 static inline u64 get_delta(u64 t1, u64 t0)
diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c
index 2d83bbc65dd0..eaf02579ea74 100644
--- a/drivers/cpufreq/cpufreq-dt.c
+++ b/drivers/cpufreq/cpufreq-dt.c
@@ -166,10 +166,9 @@ static int cpufreq_offline(struct cpufreq_policy *policy)
 	return 0;
 }
 
-static int cpufreq_exit(struct cpufreq_policy *policy)
+static void cpufreq_exit(struct cpufreq_policy *policy)
 {
 	clk_put(policy->clk);
-	return 0;
 }
 
 static struct cpufreq_driver dt_cpufreq_driver = {
diff --git a/drivers/cpufreq/cpufreq-nforce2.c b/drivers/cpufreq/cpufreq-nforce2.c
index f7a7bcf6f52e..fedad1081973 100644
--- a/drivers/cpufreq/cpufreq-nforce2.c
+++ b/drivers/cpufreq/cpufreq-nforce2.c
@@ -359,11 +359,6 @@ static int nforce2_cpu_init(struct cpufreq_policy *policy)
 	return 0;
 }
 
-static int nforce2_cpu_exit(struct cpufreq_policy *policy)
-{
-	return 0;
-}
-
 static struct cpufreq_driver nforce2_driver = {
 	.name = "nforce2",
 	.flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
@@ -371,7 +366,6 @@ static struct cpufreq_driver nforce2_driver = {
 	.target = nforce2_target,
 	.get = nforce2_get,
 	.init = nforce2_cpu_init,
-	.exit = nforce2_cpu_exit,
 };
 
 #ifdef MODULE
diff --git a/drivers/cpufreq/e_powersaver.c b/drivers/cpufreq/e_powersaver.c
index ab93bce8ae77..6e958b09e1b5 100644
--- a/drivers/cpufreq/e_powersaver.c
+++ b/drivers/cpufreq/e_powersaver.c
@@ -360,14 +360,13 @@ static int eps_cpu_init(struct cpufreq_policy *policy)
 	return 0;
 }
 
-static int eps_cpu_exit(struct cpufreq_policy *policy)
+static void eps_cpu_exit(struct cpufreq_policy *policy)
 {
 	unsigned int cpu = policy->cpu;
 
 	/* Bye */
 	kfree(eps_cpu[cpu]);
 	eps_cpu[cpu] = NULL;
-	return 0;
 }
 
 static struct cpufreq_driver eps_driver = {
diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
index 9956afb9acc2..ffb8d85d73ee 100644
--- a/include/linux/cpufreq.h
+++ b/include/linux/cpufreq.h
@@ -386,7 +386,7 @@ struct cpufreq_driver {
 
 	int		(*online)(struct cpufreq_policy *policy);
 	int		(*offline)(struct cpufreq_policy *policy);
-	int		(*exit)(struct cpufreq_policy *policy);
+	void		(*exit)(struct cpufreq_policy *policy);
 	int		(*suspend)(struct cpufreq_policy *policy);
 	int		(*resume)(struct cpufreq_policy *policy);
 
-- 
2.25.1