linux-kernel - Re: [PATCH -next 2/2] clk: renesas: fix return value and unused assignment

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Message-ID: <CAMuHMdW_5Nec7p-+msKyvt9Tubd8Ag2gj+qqc+SCG50sPK7EYw@mail.gmail.com>
Date:   Wed, 16 Jun 2021 13:57:01 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     yang.lee@...ux.alibaba.com
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next 2/2] clk: renesas: fix return value and unused assignment

Hi Yang,

On Tue, Jun 15, 2021 at 11:39 AM Yang Li <yang.lee@...ux.alibaba.com> wrote:
> Currently the function returns NULL on error, so exact error code is lost.
> This patch changes return convention of the function to use ERR_PTR()
> on error instead.
>
> Reported-by: Abaci Robot <abaci@...ux.alibaba.com>
> Signed-off-by: Yang Li <yang.lee@...ux.alibaba.com>
> ---
>  drivers/clk/renesas/renesas-rzg2l-cpg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/clk/renesas/renesas-rzg2l-cpg.c b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> index 1fcea17..5bc7e87 100644
> --- a/drivers/clk/renesas/renesas-rzg2l-cpg.c
> +++ b/drivers/clk/renesas/renesas-rzg2l-cpg.c
> @@ -183,7 +183,7 @@ static unsigned long rzg2l_cpg_pll_clk_recalc_rate(struct clk_hw *hw,
>         pll_clk = devm_kzalloc(dev, sizeof(*pll_clk), GFP_KERNEL);
>         if (!pll_clk) {
>                 clk = ERR_PTR(-ENOMEM);
> -               return NULL;
> +               return clk;
>         }

Why not simply "return ERR_PTR(-ENOMEM);"?

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