hwmon: (acpi_power_meter) Fix the fake power alarm reporting

We encountered a problem that a fake power alarm is reported to
user on the platform unsupported notifications at the second step
below:
1> Query 'power1_alarm' attribute when the power capping occurs.
2> Query 'power1_alarm' attribute when the power capping is over
   and the current average power is less then power cap value.

The root cause is that the resource->power_alarm is set to true
at the first step. And power meter use this old value to show
the power alarm state instead of the current the comparison value.

Signed-off-by: Huisong Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Guenter Roeck <[email protected]>

Author: LiHuiSong1

drivers/hwmon/acpi_power_meter.c

@@ -437,9 +437,13 @@ static ssize_t show_val(struct device *dev,
 			ret = update_cap(resource);
 			if (ret)
 				return ret;
+			resource->power_alarm = resource->power > resource->cap;
+			val = resource->power_alarm;
+		} else {
+			val = resource->power_alarm ||
+				 resource->power > resource->cap;
+			resource->power_alarm = resource->power > resource->cap;
 		}
-		val = resource->power_alarm || resource->power > resource->cap;
-		resource->power_alarm = resource->power > resource->cap;
 		break;
 	case 7:
 	case 8: