linux-kernel - Re: [PATCH v2 06/16] thermal: Don't use 'device' internal thermal zone structure field

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Message-ID: <CAJZ5v0h=UCOyJ88UgEdqch4NZK+DaT8jWnDaguQGNx-KOMhPPA@mail.gmail.com>
Date:   Wed, 22 Feb 2023 21:06:09 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Balsam CHIHI <bchihi@...libre.com>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Eduardo Valentin <edubezval@...il.com>,
        Keerthy <j-keerthy@...com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Ido Schimmel <idosch@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:TI BANDGAP AND THERMAL DRIVER" 
        <linux-omap@...r.kernel.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v2 06/16] thermal: Don't use 'device' internal thermal
 zone structure field

On Wed, Feb 22, 2023 at 9:00 PM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> On 22/02/2023 20:43, Rafael J. Wysocki wrote:
> > On Tue, Feb 21, 2023 at 7:07 PM Daniel Lezcano
> > <daniel.lezcano@...aro.org> wrote:
> >>
> >> Some drivers are directly using the thermal zone's 'device' structure
> >> field.
> >>
> >> Use the driver device pointer instead of the thermal zone device when
> >> it is available.
> >>
> >> Remove the traces when they are duplicate with the traces in the core
> >> code.
> >>
> >> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> >> Reviewed-by: Balsam CHIHI <bchihi@...libre.com> #Mediatek LVTS
> >> ---
>
> [ ... ]
>
> >>          thermal_zone_device_update(data->ti_thermal, THERMAL_EVENT_UNSPECIFIED);
> >>
> >> -       dev_dbg(&data->ti_thermal->device, "updated thermal zone %s\n",
> >> +       dev_dbg(data->bgp->dev, "updated thermal zone %s\n",
> >>                  data->ti_thermal->type);
> >
> > The code before the change is more consistent, because it refers to
> > the same object in both instances.
> >
> > It looks like a type field accessor is needed, eg. thermal_zone_device_type()?
> >
> > Or move the debug message to thermal_zone_device_update()?
>
> Actually it is done on purpose because the patch 9 replaces the accesses
> to 'type' by 'id', the thermal_zone_device_type() accessor won't be needed.

Cool.

However, this is a change in behavior (albeit small) which doesn't
appear to be necessary.

What would be wrong with having a tz->type accessor too?