linux-kernel - [PATCH AUTOSEL 6.6 132/294] hwmon: (gpio-fan) Add missing mutex locks

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Message-Id: <20250505225634.2688578-132-sashal@kernel.org>
Date: Mon,  5 May 2025 18:53:52 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Alexander Stein <alexander.stein@...tq-group.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Sasha Levin <sashal@...nel.org>,
	jdelvare@...e.com,
	linux-hwmon@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 132/294] hwmon: (gpio-fan) Add missing mutex locks

From: Alexander Stein <alexander.stein@...tq-group.com>

[ Upstream commit 9fee7d19bab635f89223cc40dfd2c8797fdc4988 ]

set_fan_speed() is expected to be called with fan_data->lock being locked.
Add locking for proper synchronization.

Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
Link: https://lore.kernel.org/r/20250210145934.761280-3-alexander.stein@ew.tq-group.com
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwmon/gpio-fan.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c
index d92c536be9af7..b779240328d59 100644
--- a/drivers/hwmon/gpio-fan.c
+++ b/drivers/hwmon/gpio-fan.c
@@ -393,7 +393,12 @@ static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
 	if (state >= fan_data->num_speed)
 		return -EINVAL;
 
+	mutex_lock(&fan_data->lock);
+
 	set_fan_speed(fan_data, state);
+
+	mutex_unlock(&fan_data->lock);
+
 	return 0;
 }
 
@@ -489,7 +494,11 @@ MODULE_DEVICE_TABLE(of, of_gpio_fan_match);
 
 static void gpio_fan_stop(void *data)
 {
+	struct gpio_fan_data *fan_data = data;
+
+	mutex_lock(&fan_data->lock);
 	set_fan_speed(data, 0);
+	mutex_unlock(&fan_data->lock);
 }
 
 static int gpio_fan_probe(struct platform_device *pdev)
@@ -562,7 +571,9 @@ static int gpio_fan_suspend(struct device *dev)
 
 	if (fan_data->gpios) {
 		fan_data->resume_speed = fan_data->speed_index;
+		mutex_lock(&fan_data->lock);
 		set_fan_speed(fan_data, 0);
+		mutex_unlock(&fan_data->lock);
 	}
 
 	return 0;
@@ -572,8 +583,11 @@ static int gpio_fan_resume(struct device *dev)
 {
 	struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 
-	if (fan_data->gpios)
+	if (fan_data->gpios) {
+		mutex_lock(&fan_data->lock);
 		set_fan_speed(fan_data, fan_data->resume_speed);
+		mutex_unlock(&fan_data->lock);
+	}
 
 	return 0;
 }
-- 
2.39.5