linux-kernel - Re: [PATCH] pinctrl: rzn1: remove unnecessary unsigned integer comparison

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Message-ID: <CAMuHMdWU-Xo5rpBmjHqjUQAUmQS7_XKYWkeaYbcoAFjeci_22Q@mail.gmail.com>
Date:   Wed, 24 Mar 2021 10:49:08 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl: rzn1: remove unnecessary unsigned integer comparison

Hi Gustavo,

On Thu, Oct 11, 2018 at 10:42 PM Gustavo A. R. Silva
<gustavo@...eddedor.com> wrote:
> There is no need to compare ipctl->mdio_func[mdio] with => 0, because
> such comparison is always true. Notice that *mdio_func* is of type
> u32 (32 bits, unsigned).
>
> Fix this by removing such comparison.
>
> Addresses-Coverity-ID: 1474166 ("Unsigned compared against 0")
> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>

Thanks for your patch, which I somehow missed to review.
Sorry for that.

> --- a/drivers/pinctrl/pinctrl-rzn1.c
> +++ b/drivers/pinctrl/pinctrl-rzn1.c
> @@ -195,7 +195,7 @@ static void rzn1_hw_set_lock(struct rzn1_pinctrl *ipctl, u8 lock, u8 value)
>  static void rzn1_pinctrl_mdio_select(struct rzn1_pinctrl *ipctl, int mdio,
>                                      u32 func)
>  {
> -       if (ipctl->mdio_func[mdio] >= 0 && ipctl->mdio_func[mdio] != func)
> +       if (ipctl->mdio_func[mdio] != func)

Note that mdio_func is initialized to -1, hence the check.
But the check indeed didn't work this way, so mdio_func was changed
later to int in commit 8deaaa46d2de91e3 ("pinctrl: rzn1: Fix check for
used MDIO bus").

>                 dev_warn(ipctl->dev, "conflicting setting for mdio%d!\n", mdio);
>         ipctl->mdio_func[mdio] = func;

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