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

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Message-ID: <CAMuHMdWwzwHnZazp79q0R7n7MjKDQXRH_RqRSmNd1vdN_9JTqA@mail.gmail.com>
Date: Thu, 20 Feb 2025 17:37:40 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Claudiu <claudiu.beznea@...on.dev>
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 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.

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