summaryrefslogtreecommitdiff
path: root/drivers/hwmon/acpi_power_meter.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/hwmon/acpi_power_meter.c')
-rw-r--r--drivers/hwmon/acpi_power_meter.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 8db740214ffd..703666b95bf4 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -31,6 +31,7 @@
#define POWER_METER_CAN_NOTIFY (1 << 3)
#define POWER_METER_IS_BATTERY (1 << 8)
#define UNKNOWN_HYSTERESIS 0xFFFFFFFF
+#define UNKNOWN_POWER 0xFFFFFFFF
#define METER_NOTIFY_CONFIG 0x80
#define METER_NOTIFY_TRIP 0x81
@@ -348,6 +349,9 @@ static ssize_t show_power(struct device *dev,
update_meter(resource);
mutex_unlock(&resource->lock);
+ if (resource->power == UNKNOWN_POWER)
+ return -ENODATA;
+
return sprintf(buf, "%llu\n", resource->power * 1000);
}