linux-kernel - Re: [PATCH v2 4/5] drm/solomon: Move device info from ssd130x-i2c to the core driver

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Message-ID: <YlVg8PE6SBzhmqjI@smile.fi.intel.com>
Date:   Tue, 12 Apr 2022 14:22:24 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh@...nel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Chen-Yu Tsai <wens@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>
Subject: Re: [PATCH v2 4/5] drm/solomon: Move device info from ssd130x-i2c to
 the core driver

On Tue, Apr 12, 2022 at 02:21:08PM +0300, Andy Shevchenko wrote:
> On Tue, Apr 12, 2022 at 10:07:02AM +0200, Javier Martinez Canillas wrote:
> > On 4/12/22 09:23, Geert Uytterhoeven wrote:
> > > On Mon, Apr 11, 2022 at 11:12 PM Javier Martinez Canillas
> > > <javierm@...hat.com> wrote:

...

> > >> -       ssd130x->device_info = device_get_match_data(dev);
> > >> +
> > >> +       variant = (enum ssd130x_variants)device_get_match_data(dev);
> > > 
> > > (uintptr_t), to avoid a cast from pointer to integer of different
> > > size warning.
> > >
> > 
> > Indeed. The kernel test robot reported the same.
> 
> Not only because of this, but also with the non-NULL pointers I prefer the old
> style without ugly castings.
> 
> Instead, you may export the array (in the driver's namespace) and use
> &info[ID] pointer for the specific device info.

Note that device_get_match_data() has no clue if the data is absent or
data == (void *)0.

-- 
With Best Regards,
Andy Shevchenko