From: Xing Tong Wu xingtong.wu@siemens.com
[ Upstream commit 8b3800256abad20e91c2698607f9b28591407b19 ]
Setting the fan speed is only valid in manual mode; it is not possible to set the fan's speed in automatic mode. Return error when attempting to set the fan speed in automatic mode.
Signed-off-by: Xing Tong Wu xingtong.wu@siemens.com Link: https://lore.kernel.org/r/20231121081604.2499-3-xingtong_wu@163.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/nct6775-core.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/hwmon/nct6775-core.c b/drivers/hwmon/nct6775-core.c index 80310845fb99..9720ad214c20 100644 --- a/drivers/hwmon/nct6775-core.c +++ b/drivers/hwmon/nct6775-core.c @@ -2462,6 +2462,13 @@ store_pwm(struct device *dev, struct device_attribute *attr, const char *buf, int err; u16 reg;
+ /* + * The fan control mode should be set to manual if the user wants to adjust + * the fan speed. Otherwise, it will fail to set. + */ + if (index == 0 && data->pwm_enable[nr] > manual) + return -EBUSY; + err = kstrtoul(buf, 10, &val); if (err < 0) return err;