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

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Message-ID: <d1e4fead-d486-4836-a48f-8421571b8ed8@tuxon.dev>
Date: Thu, 20 Feb 2025 18:40:27 +0200
From: "claudiu beznea (tuxon)" <claudiu.beznea@...on.dev>
To: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: 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

Hi, Geert,

On 2/20/25 18:37, Geert Uytterhoeven wrote:
> Hi Claudiu,
>
> On Thu, 20 Feb 2025 at 17:00, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>> On Sat, 15 Feb 2025 at 14:18, 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>
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>> i.e. will queue in renesas-devel for v6.15.
> As the offending commit is only in renesas-devel, I'll fold the fix into
> the original commit.

Sure, thank you!

>
> Gr{oetje,eeting}s,
>
>                          Geert
>