linux-kernel - Re: [PATCH v2] pinctrl: renesas: pinctrl-rzg2l: Add validation of GPIO pin in rzg2l_gpio

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Date:   Mon, 18 Sep 2023 13:55:56 +0100
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-renesas-soc@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Biju Das <biju.das.jz@...renesas.com>,
        Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v2] pinctrl: renesas: pinctrl-rzg2l: Add validation of
 GPIO pin in rzg2l_gpio_request()

Hi Geert,

Thank you for the review.

On Mon, Sep 18, 2023 at 1:31 PM Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Prabhakar,
>
> On Mon, Sep 11, 2023 at 3:17 PM Prabhakar <prabhakar.csengg@...il.com> wrote:
> > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> >
> > Validate the GPIO pin request in rzg2l_gpio_request() callback using
> > rzg2l_validate_gpio_pin() function. This stops any accidental usage
> > of GPIO pins which are not supported by the SoCs.
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > Reviewed-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> > Tested-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> > ---
> > v1->v2
> > * Maintained reverse christmas tree order.
> > * Included RB/TB tags from Claudiu.
>
> Thanks for your patch!
>
> > --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
> > @@ -795,12 +795,18 @@ static const struct pinconf_ops rzg2l_pinctrl_confops = {
> >  static int rzg2l_gpio_request(struct gpio_chip *chip, unsigned int offset)
> >  {
> >         struct rzg2l_pinctrl *pctrl = gpiochip_get_data(chip);
> > +       const struct pinctrl_pin_desc *pin = &pctrl->desc.pins[offset];
> >         u32 port = RZG2L_PIN_ID_TO_PORT(offset);
> >         u8 bit = RZG2L_PIN_ID_TO_PIN(offset);
> > +       u64 *pin_data = pin->drv_data;
>
> isn't drv_data a pointer to unsigned int aka u32?
>
Agreed. I will fix this and send a v3.

Cheers,
Prabhakar

> >         unsigned long flags;
> >         u8 reg8;
> >         int ret;
> >
> > +       ret = rzg2l_validate_gpio_pin(pctrl, *pin_data, port, bit);
> > +       if (ret)
> > +               return ret;
> > +
> >         ret = pinctrl_gpio_request(chip->base + offset);
> >         if (ret)
> >                 return ret;
>
> The rest LGTM.
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds