Re: [PATCH v3 2/2] hwmon: acpi_power_meter: convert to hwmon_device_register_with_info

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On 5/13/22 01:02, LABBE Corentin wrote:
Le Wed, May 11, 2022 at 07:10:29PM -0700, Guenter Roeck a écrit :
Corentin,

On 5/8/22 23:30, Corentin Labbe wrote:
Booting lead to a hwmon_device_register() is deprecated. Please convert the driver to use hwmon_device_register_with_info().
So let's convert the driver to use hwmon_device_register_with_info().

Signed-off-by: Corentin Labbe <clabbe@xxxxxxxxxxxx>
---
[ ... ]

@@ -836,20 +740,20 @@ static void acpi_power_meter_notify(struct acpi_device *device, u32 event)
   		if (res)
   			break;
- remove_attrs(resource);
+		remove_domain_devices(resource);
   		setup_attrs(resource);

Zhang Rui found an interesting problem with this code:
It needs a call to sysfs_update_groups(hwmon_dev->groups)
to update sysfs attribute visibility, probably between
remove_domain_devices() and setup_attrs().

   		break;
   	case METER_NOTIFY_TRIP:
-		sysfs_notify(&device->dev.kobj, NULL, POWER_AVERAGE_NAME);
+		hwmon_notify_event(&device->dev, hwmon_power, hwmon_power_average, 0);

... which makes realize: The notification device should be the hwmon device.
That would be resource->hwmon_dev, not the acpi device.


Hello

I will fix this, but do you have an example how to test thoses code path easily ?


No, sorry.

Guenter



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