On 11/25/24 01:34, Huisong Li wrote:
The power trip points maintained in local should not be updated when '_PTP'
method fails to evaluate.
Signed-off-by: Huisong Li <lihuisong@xxxxxxxxxx>
---
drivers/hwmon/acpi_power_meter.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/acpi_power_meter.c b/drivers/hwmon/acpi_power_meter.c
index 4c3314e35d30..95da73858a0b 100644
--- a/drivers/hwmon/acpi_power_meter.c
+++ b/drivers/hwmon/acpi_power_meter.c
@@ -292,8 +292,8 @@ static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
struct acpi_device *acpi_dev = to_acpi_device(dev);
struct acpi_power_meter_resource *resource = acpi_dev->driver_data;
+ unsigned long temp, trip_bk;
int res;
- unsigned long temp;
res = kstrtoul(buf, 10, &temp);
if (res)
@@ -302,8 +302,11 @@ static ssize_t set_trip(struct device *dev, struct device_attribute *devattr,
temp = DIV_ROUND_CLOSEST(temp, 1000);
mutex_lock(&resource->lock);
+ trip_bk = resource->trip[attr->index - 7];
resource->trip[attr->index - 7] = temp;
res = set_acpi_trip(resource);
+ if (!res)
+ resource->trip[attr->index - 7] = trip_bk;
Unless I am missing something, this restores the old value if setting
the new value succeeded. Please explain.
Thanks,
Guenter
mutex_unlock(&resource->lock);
if (res)
