linux-kernel - Re: [PATCH v2] platform/x86: thinkpad_acpi: Switch to common use of attributes

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Date:   Sun, 26 Sep 2021 13:49:34 +0200
From:   Len Baker <len.baker@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Len Baker <len.baker@....com>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Hans de Goede <hdegoede@...hat.com>,
        Mark Gross <mgross@...ux.intel.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org,
        linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] platform/x86: thinkpad_acpi: Switch to common use of
 attributes

Hi Greg,

On Sun, Sep 26, 2021 at 01:32:16PM +0200, Greg Kroah-Hartman wrote:
> On Sun, Sep 26, 2021 at 01:19:08PM +0200, Len Baker wrote:
>
> > @@ -3161,9 +3106,7 @@ static void hotkey_exit(void)
> >  	hotkey_poll_stop_sync();
> >  	mutex_unlock(&hotkey_mutex);
> >  #endif
> > -
> > -	if (hotkey_dev_attributes)
> > -		delete_attr_set(hotkey_dev_attributes, &tpacpi_pdev->dev.kobj);
> > +	sysfs_remove_group(&tpacpi_pdev->dev.kobj, &hotkey_attr_group);
>
> Why do you have to manually add/remove these groups still?
>
> A huge hint that something is going wrong is when you have to call a
> sysfs_*() call from within a driver.  There should be proper driver_*()
> calls for you instead to get the job done.
>
> As this is a platform device, why not set the dev_groups variable in the
> platform_driver field so that these attribute groups get added and
> removed automatically?
>
> An example commit to look at that shows how this was converted for one
> driver is 5bd08a4ae3d0 ("platform: x86: hp-wmi: convert platform driver
> to use dev_groups").  See if that helps here as well.

Ok, I will look at this and I will try to improve the patch. Anyway thanks
for the guidance and advices.

Again, thanks for your time.

Regards,
Len