linux-kernel - Re: [PATCH v7 01/16] pinctrl: check the return value of pinmux_ops::get_function

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Message-ID: <aLb9GKnQkAiayqpD@smile.fi.intel.com>
Date: Tue, 2 Sep 2025 17:20:08 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: 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>,
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	Fabio Estevam <festevam@...il.com>, 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,
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	imx@...ts.linux.dev, linux-omap@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	stable@...r.kernel.org
Subject: Re: [PATCH v7 01/16] pinctrl: check the return value of
 pinmux_ops::get_function_name()

On Tue, Sep 02, 2025 at 04:02:27PM +0200, Bartosz Golaszewski wrote:
> On Tue, Sep 2, 2025 at 3:50 PM Andy Shevchenko
> <andriy.shevchenko@...el.com> wrote:
> > On Tue, Sep 02, 2025 at 03:29:31PM +0200, Bartosz Golaszewski wrote:
> > > On Tue, Sep 2, 2025 at 3:06 PM Andy Shevchenko
> > > <andriy.shevchenko@...el.com> wrote:
> > > > On Tue, Sep 02, 2025 at 01:59:10PM +0200, Bartosz Golaszewski wrote:

...

> > > > Fixes?
> > >
> > > This has always been like that.
> > >
> > > > Reported?
> > >
> > > I mean, technically Mark Brown reported my previous patch failing but
> > > I don't think we do this if we're still within the same series just
> > > another iteration?
> > >
> > > > Closes?
> > >
> > > Ditto.
> >
> > I meant that this fixes a potential issue disregard to your series, right?
> 
> No, as long as the imx driver keeps putting stuff into the pin
> function radix tree directly, this cannot happen. The issue was
> triggered by the discrepancy between the number of added selectors and
> the hardcoded number of functions (we started at 0 which was not in
> the radix tree and crashed before we got to 1).

Ah, thanks for the explanation. The problem is that current commit message
implies a (potential) but lurking somewhere (regardless IMX case). Can you
amend it to make more explicit that there is no bug right now.

-- 
With Best Regards,
Andy Shevchenko