linux-kernel - Re: [PATCH v3 2/2] hwmon: acpi_power_meter: convert to hwmon_device_register_with

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Message-ID: <83c22b32-d3e0-eb85-02b5-0068dcf0412f@roeck-us.net>
Date:   Fri, 13 May 2022 06:03:33 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     LABBE Corentin <clabbe@...libre.com>
Cc:     jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org, Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH v3 2/2] hwmon: acpi_power_meter: convert to
 hwmon_device_register_with_info

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@...libre.com>
>>> ---
>> [ ... ]
>>
>>> @@ -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