platform/x86: asus-wmi: Ignore return value when writing thermal policy

On some machines like the ASUS Vivobook S14 writing the thermal policy
returns the currently writen thermal policy instead of an error code.

Ignore the return code to avoid falsely returning an error when the
thermal policy was written successfully.

Reported-by: [email protected]
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219517
Fixes: 2daa86e ("platform/x86: asus_wmi: Support throttle thermal policy")
Signed-off-by: Armin Wolf <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>

Author: Wer-Wolf

drivers/platform/x86/asus-wmi.c

@@ -3696,7 +3696,6 @@ static int asus_wmi_custom_fan_curve_init(struct asus_wmi *asus)
 /* Throttle thermal policy ****************************************************/
 static int throttle_thermal_policy_write(struct asus_wmi *asus)
 {
-	u32 retval;
 	u8 value;
 	int err;
 
@@ -3718,8 +3717,8 @@ static int throttle_thermal_policy_write(struct asus_wmi *asus)
 		value = asus->throttle_thermal_policy_mode;
 	}
 
-	err = asus_wmi_set_devstate(asus->throttle_thermal_policy_dev,
-				    value, &retval);
+	/* Some machines do not return an error code as a result, so we ignore it */
+	err = asus_wmi_set_devstate(asus->throttle_thermal_policy_dev, value, NULL);
 
 	sysfs_notify(&asus->platform_device->dev.kobj, NULL,
 			"throttle_thermal_policy");
@@ -3729,12 +3728,6 @@ static int throttle_thermal_policy_write(struct asus_wmi *asus)
 		return err;
 	}
 
-	if (retval != 1) {
-		pr_warn("Failed to set throttle thermal policy (retval): 0x%x\n",
-			retval);
-		return -EIO;
-	}
-
 	/* Must set to disabled if mode is toggled */
 	if (asus->cpu_fan_curve_available)
 		asus->custom_fan_curves[FAN_CURVE_DEV_CPU].enabled = false;