netdev - Re: [PATCH] net: dsa: microchip: remove of_match_ptr() from ksz9477_dt

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Message-ID: <CAFqt6zZF-bTh_8vYxwhG5wWvCkFHc2duK2A14_Fdt9Agzfkxwg@mail.gmail.com>
Date:   Thu, 28 Jul 2022 06:16:50 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     woojung.huh@...rochip.com, UNGLinuxDriver@...rochip.com,
        Andrew Lunn <andrew@...n.ch>, vivien.didelot@...il.com,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>
Subject: Re: [PATCH] net: dsa: microchip: remove of_match_ptr() from ksz9477_dt_ids

On Thu, Jul 28, 2022 at 5:46 AM Vladimir Oltean <olteanv@...il.com> wrote:
>
> On Wed, Jul 27, 2022 at 08:22:55AM +0530, Souptick Joarder wrote:
> > From: "Souptick Joarder (HPE)" <jrdr.linux@...il.com>
> >
> > >> drivers/net/dsa/microchip/ksz9477_i2c.c:89:34:
> > warning: 'ksz9477_dt_ids' defined but not used [-Wunused-const-variable=]
> >       89 | static const struct of_device_id ksz9477_dt_ids[] = {
> >          |                                  ^~~~~~~~~~~~~~
> >
> > Removed of_match_ptr() from ksz9477_dt_ids.
> >
> > Reported-by: kernel test robot <lkp@...el.com>
> > Signed-off-by: Souptick Joarder (HPE) <jrdr.linux@...il.com>
> > ---
>
> I have to say, this is a major fail for what of_match_ptr() intended to do.
>
> commit 3a1e362e3f3cd571b3974b8d44b8e358ec7a098c
> Author: Ben Dooks <ben-linux@...ff.org>
> Date:   Wed Aug 3 10:11:42 2011 +0100
>
>     OF: Add of_match_ptr() macro
>
>     Add a macro of_match_ptr() that allows the .of_match_table
>     entry in the driver structures to be assigned without having
>     an #ifdef xxx NULL for the case that OF is not enabled
>
>     Signed-off-by: Ben Dooks <ben-linux@...ff.org>
>     Signed-off-by: Grant Likely <grant.likely@...retlab.ca>
>
> Should we also depend on CONFIG_OF?

Few other drivers threw similar warnings and the suggestion was to
remove of_match_ptr(). Anyway both approaches look fine.

>
> >  drivers/net/dsa/microchip/ksz9477_i2c.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/dsa/microchip/ksz9477_i2c.c b/drivers/net/dsa/microchip/ksz9477_i2c.c
> > index 99966514d444..c967a03a22c6 100644
> > --- a/drivers/net/dsa/microchip/ksz9477_i2c.c
> > +++ b/drivers/net/dsa/microchip/ksz9477_i2c.c
> > @@ -118,7 +118,7 @@ MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
> >  static struct i2c_driver ksz9477_i2c_driver = {
> >       .driver = {
> >               .name   = "ksz9477-switch",
> > -             .of_match_table = of_match_ptr(ksz9477_dt_ids),
> > +             .of_match_table = ksz9477_dt_ids,
> >       },
> >       .probe  = ksz9477_i2c_probe,
> >       .remove = ksz9477_i2c_remove,
> > --
> > 2.25.1
> >