linux-kernel - Re: [PATCH] soc: renesas: rz-sysc: Suppress binding attributes

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Message-ID: <CA+V-a8tHw11_TdnUoO0m=-z2YWsGs742LbH+9Tnq0Bx3DVdFgA@mail.gmail.com>
Date: Tue, 18 Feb 2025 20:46:50 +0000
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Claudiu <claudiu.beznea@...on.dev>
Cc: geert+renesas@...der.be, magnus.damm@...il.com, 
	john.madieu.xa@...renesas.com, linux-renesas-soc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, 
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH] soc: renesas: rz-sysc: Suppress binding attributes

On Sat, Feb 15, 2025 at 1:18 PM Claudiu <claudiu.beznea@...on.dev> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
>
> The matching data for the rz-sysc driver is marked with __initconst, which
> means it is discarded after initialization. Because of this, attempting to
> unbind/bind the driver through sysfs after system boot can lead to "Unable
> to handle kernel paging request at virtual address" errors due to accessing
> freed memory.
>
> Since the System Controller (SYSC) is an essential block for Renesas SoCs,
> suppress binding attributes to prevent them being exposed in sysfs,
> avoiding potential issues.
>
> Fixes: 1660e5ea6a3e ("soc: renesas: Add SYSC driver for Renesas RZ family")
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> ---
>  drivers/soc/renesas/rz-sysc.c | 1 +
>  1 file changed, 1 insertion(+)
>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Cheers,
Prabhakar

> diff --git a/drivers/soc/renesas/rz-sysc.c b/drivers/soc/renesas/rz-sysc.c
> index 1c98da37b7d1..14db508f669f 100644
> --- a/drivers/soc/renesas/rz-sysc.c
> +++ b/drivers/soc/renesas/rz-sysc.c
> @@ -120,6 +120,7 @@ static int rz_sysc_probe(struct platform_device *pdev)
>  static struct platform_driver rz_sysc_driver = {
>         .driver = {
>                 .name = "renesas-rz-sysc",
> +               .suppress_bind_attrs = true,
>                 .of_match_table = rz_sysc_match
>         },
>         .probe = rz_sysc_probe
> --
> 2.43.0
>
>