This is a note to let you know that I've just added the patch titled
hwmon: (nct6775) Fix fan speed set failure in automatic mode
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
hwmon-nct6775-fix-fan-speed-set-failure-in-automatic.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ea4c03ce6cbf520ca91e8b6ce4d9958f54283a3f
Author: Xing Tong Wu <xingtong.wu@xxxxxxxxxxx>
Date: Tue Nov 21 16:16:04 2023 +0800
hwmon: (nct6775) Fix fan speed set failure in automatic mode
[ 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@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231121081604.2499-3-xingtong_wu@xxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
