linux-kernel - Re: [PATCH v7 16/16] pinctrl: qcom: make the pinmuxing strict

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Message-ID: <CAMRc=MfhhX2NJ0fhhX8u+7=sdyUy0G27n7caGf9=TpHxUDJVxg@mail.gmail.com>
Date: Wed, 3 Sep 2025 09:33:34 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Andy Shevchenko <andriy.shevchenko@...el.com>, Linus Walleij <linus.walleij@...aro.org>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Alexey Klimov <alexey.klimov@...aro.org>, Lorenzo Bianconi <lorenzo@...nel.org>, 
	Sean Wang <sean.wang@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, 
	Paul Cercueil <paul@...pouillou.net>, Kees Cook <kees@...nel.org>, 
	Andy Shevchenko <andy@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	David Hildenbrand <david@...hat.com>, Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
	"Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka <vbabka@...e.cz>, 
	Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
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	Shawn Guo <shawnguo@...nel.org>, Jacky Bai <ping.bai@....com>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, NXP S32 Linux Team <s32@....com>, 
	Sascha Hauer <s.hauer@...gutronix.de>, Tony Lindgren <tony@...mide.com>, 
	Haojian Zhuang <haojian.zhuang@...aro.org>, Geert Uytterhoeven <geert+renesas@...der.be>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Danilo Krummrich <dakr@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>, 
	Mark Brown <broonie@...nel.org>, linux-gpio@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org, 
	linux-mediatek@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mips@...r.kernel.org, linux-hardening@...r.kernel.org, 
	linux-mm@...ck.org, imx@...ts.linux.dev, linux-omap@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
	Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: Re: [PATCH v7 16/16] pinctrl: qcom: make the pinmuxing strict

On Tue, Sep 2, 2025 at 10:46 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Tue, Sep 2, 2025 at 8:42 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
> >
> > On Tue, Sep 2, 2025 at 4:38 PM Andy Shevchenko
> > <andriy.shevchenko@...el.com> wrote:
> > >
> > > On Tue, Sep 02, 2025 at 01:59:25PM +0200, Bartosz Golaszewski wrote:
> > > > From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> > > >
> > > > The strict flag in struct pinmux_ops disallows the usage of the same pin
> > > > as a GPIO and for another function. Without it, a rouge user-space
> > > > process with enough privileges (or even a buggy driver) can request a
> > > > used pin as GPIO and drive it, potentially confusing devices or even
> > > > crashing the system. Set it globally for all pinctrl-msm users.
> > >
> > > How does this keep (or allow) I涎 generic recovery mechanism to work?
> >
> > What even is the "generic recovery mechanism"? That's the first time
> > I'm hearing this name.
>
> "I²C generic recovery mechanism" (I dunno why you put away the I²C keyword).
>

For some reason it was displayed like that[1] in my client. I see it's
correct in lore though.

Anyway, what is your point? I don't think it has any impact on this.

Bartosz

[1] https://postimg.cc/7GFtxzzR