linux-kernel - Re: [PATCH] soc: renesas: renesas-soc: release 'chipid' from ioremap()

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Message-ID: <CAMuHMdV5guFbo76nq27aZjWsYqneOfGNf0Ozyh0C53+VgnXgXw@mail.gmail.com>
Date:   Fri, 31 Mar 2023 14:13:10 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Li Yang <lidaxian@...t.edu.cn>
Cc:     Magnus Damm <magnus.damm@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Dan Carpenter <error27@...il.com>,
        linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soc: renesas: renesas-soc: release 'chipid' from ioremap()

Hi Li,

On Fri, Mar 31, 2023 at 12:14 PM Li Yang <lidaxian@...t.edu.cn> wrote:
> Smatch reports:
>
> drivers/soc/renesas/renesas-soc.c:536 renesas_soc_init() warn:
> 'chipid' from ioremap() not released on lines: 475.
>
> If soc_dev_atrr allocation is failed, function renesas_soc_init()
> will return without releasing 'chipid' from ioremap().
>
> Fix this by adding function iounmap().
>
> Fixes: cb5508e47e60 ("soc: renesas: Add support for reading product revision for RZ/G2L family")
> Signed-off-by: Li Yang <lidaxian@...t.edu.cn>
> Reviewed-by: Dan Carpenter <error27@...il.com>

Thanks for your patch!

> --- a/drivers/soc/renesas/renesas-soc.c
> +++ b/drivers/soc/renesas/renesas-soc.c
> @@ -471,8 +471,11 @@ static int __init renesas_soc_init(void)
>         }
>
>         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
> -       if (!soc_dev_attr)
> +       if (!soc_dev_attr) {
> +               if (chipid)
> +                       iounmap(chipid);

We don't really care, as the system is dead at this point anyway.

>                 return -ENOMEM;
> +       }
>
>         np = of_find_node_by_path("/");
>         of_property_read_string(np, "model", &soc_dev_attr->machine);

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