linux-kernel - Re: [PATCH v2 06/16] clk: starfive: Add JH7100 clock generator driver

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Date:   Fri, 22 Oct 2021 15:13:44 +0200
From:   Emil Renner Berthing <kernel@...il.dk>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     linux-riscv <linux-riscv@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        Maximilian Luz <luzmaximilian@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Drew Fustini <drew@...gleboard.org>,
        Michael Zhu <michael.zhu@...rfivetech.com>,
        Fu Wei <tekkamanninja@...il.com>,
        Anup Patel <anup.patel@....com>,
        Atish Patra <atish.patra@....com>,
        Matteo Croce <mcroce@...rosoft.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 06/16] clk: starfive: Add JH7100 clock generator driver

On Fri, 22 Oct 2021 at 14:34, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
> On Thu, Oct 21, 2021 at 8:43 PM Emil Renner Berthing <kernel@...il.dk> wrote:
>
> ...
>
> > +static struct clk_hw *clk_starfive_jh7100_get(struct of_phandle_args *clkspec, void *data)
> > +{
> > +       struct clk_starfive_jh7100_priv *priv = data;
> > +       unsigned int idx = clkspec->args[0];
> > +
> > +       if (idx >= JH7100_CLK_END) {
> > +               dev_err(priv->dev, "invalid clock index %u\n", idx);
> > +               return ERR_PTR(-EINVAL);
>
> After this
> https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git/commit/?h=driver-core-next&id=7065f92255bb2468dbb9aa0537ff186ef64d5a02
> It's okay to use
>
> > +       }
>
>        if (idx >= JH7100_CLK_END)
>                return dev_err_probe(priv->dev, -EINVAL, "invalid clock
> index %u\n", idx);
>
> Ditto for other similar cases.

Hmm.. this function doesn't return int, but struct clk_hw *, hence the ERR_PTR.
Also I don't see any other similar cases in this driver.

> > +       if (idx >= JH7100_CLK_PLL0_OUT)
> > +               return priv->pll[idx - JH7100_CLK_PLL0_OUT];
> > +
> > +       return &priv->reg[idx].hw;
> > +}
>
> ...
>
> > +       while (idx)
> > +               clk_hw_unregister(&priv->reg[--idx].hw);
>
> I still consider that usual pattern, i.e.
>
>        while (idx--)
>                clk_hw_unregister(&priv->reg[idx].hw);
>
> but since you are pushing hard for your variant I'll leave it to the
> maintainers and author.
>
> --
> With Best Regards,
> Andy Shevchenko