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

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Date:   Fri, 13 May 2022 19:33:27 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     LABBE Corentin <clabbe@...libre.com>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     jdelvare@...e.com, linux-hwmon@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] hwmon: acpi_power_meter: convert to
 hwmon_device_register_with_info

On Fri, 2022-05-13 at 10:02 +0200, 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, I don't have one.

-rui