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hwmon: (cros_ec) Synchronize EC access from the thermal device callbacks

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To guarantee consistency for the read-modify-write access in
cros_ec_hwmon_cooling_set_cur_state(), locking is necessary.

Use the existing hwmon device lock to do so.

Fixes: 5798b62867 ("hwmon: (cros_ec) register fans into thermal framework cooling devices")
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Link: https://lore.kernel.org/r/20260711-cros_ec-hwmon-locking-v1-3-cb6d0fdbb2d3@weissschuh.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Thomas Weißschuh 2026-07-11 11:59:07 +02:00 committed by Guenter Roeck
parent 434baf3aea
commit 26db273640
1 changed files with 5 additions and 0 deletions
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5
drivers/hwmon/cros_ec_hwmon.c
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@ -5,6 +5,7 @@
* Copyright (C) 2024 Thomas Weißschuh <linux@weissschuh.net>
*/
#include <linux/cleanup.h>
#include <linux/device.h>
#include <linux/hwmon.h>
#include <linux/math.h>
@ -410,6 +411,8 @@ static int cros_ec_hwmon_cooling_get_cur_state(struct thermal_cooling_device *cd
u8 read_val;
int ret;
guard(hwmon_lock)(priv->hwmon_priv->hwmon_dev);
ret = cros_ec_hwmon_read_pwm_value(priv->hwmon_priv->cros_ec, priv->index, &read_val);
if (ret)
return ret;
@ -423,6 +426,8 @@ static int cros_ec_hwmon_cooling_set_cur_state(struct thermal_cooling_device *cd
{
const struct cros_ec_hwmon_cooling_priv *priv = cdev->devdata;
guard(hwmon_lock)(priv->hwmon_priv->hwmon_dev);
return cros_ec_hwmon_write_pwm_input(priv->hwmon_priv->cros_ec, priv->index, val);
}