Re: [PATCH] net: dsa: microchip: remove of_match_ptr() from ksz9477_dt_ids

[Souptick Joarder]

On Thu, Jul 28, 2022 at 5:46 AM Vladimir Oltean <olteanv@xxxxxxxxx> wrote:
>
> On Wed, Jul 27, 2022 at 08:22:55AM +0530, Souptick Joarder wrote:
> > From: "Souptick Joarder (HPE)" <jrdr.linux@xxxxxxxxx>
> >
> > >> 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@xxxxxxxxx>
> > Signed-off-by: Souptick Joarder (HPE) <jrdr.linux@xxxxxxxxx>
> > ---
>
> I have to say, this is a major fail for what of_match_ptr() intended to do.
>
> commit 3a1e362e3f3cd571b3974b8d44b8e358ec7a098c
> Author: Ben Dooks <ben-linux@xxxxxxxxx>
> 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@xxxxxxxxx>
>     Signed-off-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
>
> 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
> >