Re: [PATCH v1 2/4] hwmon: (acpi_power_meter) Fix update the power trip points on failure

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在 2024/11/25 23:22, Guenter Roeck 写道:
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.

Yes, you are right.
Restore the old value on faiure. will fix it.

mutex_unlock(&resource->lock);
        if (res)

.




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