linux-kernel - Re: [PATCH] pinctrl: pinconf-generic: check error value EOPNOTSUPP

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Date: Thu, 4 Apr 2024 22:23:24 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: "Peng Fan (OSS)" <peng.fan@....nxp.com>, brgl@...ev.pl,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	cristian.marussi@....com, sudeep.holla@....com,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] pinctrl: pinconf-generic: check error value EOPNOTSUPP

On Thu, Apr 04, 2024 at 09:03:02PM +0200, Linus Walleij wrote:
> On Thu, Apr 4, 2024 at 7:05 PM Andy Shevchenko
> <andriy.shevchenko@...el.com> wrote:
> > On Thu, Apr 04, 2024 at 01:44:50PM +0200, Linus Walleij wrote:
> > > On Mon, Apr 1, 2024 at 4:02 PM Peng Fan (OSS) <peng.fan@....nxp.com> wrote:
> > >
> > > > From: Peng Fan <peng.fan@....com>
> > > >
> > > > The SCMI error value SCMI_ERR_SUPPORT maps to linux error value
> > > > '-EOPNOTSUPP', so when dump configs, need check the error value
> > > > EOPNOTSUPP, otherwise there will be log "ERROR READING CONFIG SETTING".
> > > >
> > > > Signed-off-by: Peng Fan <peng.fan@....com>
> > > (...)
> > > >                         ret = pin_config_get_for_pin(pctldev, pin, &config);
> > > >                 /* These are legal errors */
> > > > -               if (ret == -EINVAL || ret == -ENOTSUPP)
> > > > +               if (ret == -EINVAL || ret == -ENOTSUPP || ret == -EOPNOTSUPP)
> > >
> > > TBH it's a bit odd to call an in-kernel API such as pin_config_get_for_pin()
> > > and get -EOPNOTSUPP back. But it's not like I care a lot, so patch applied.
> >
> > Hmm... I would like actually to get this being consistent. The documentation
> > explicitly says that in-kernel APIs uses Linux error code and not POSIX one.
> >
> > This check opens a Pandora box.
> >
> > FWIW, it just like dozen or so drivers that needs to be fixed, I prefer to
> > have them being moved to ENOTSUPP, rather this patch.

$ git grep -lw EOPNOTSUPP -- drivers/pinctrl/ drivers/gpio/
drivers/gpio/gpio-crystalcove.c
drivers/gpio/gpio-pcie-idio-24.c
drivers/gpio/gpio-regmap.c
drivers/gpio/gpio-wcove.c
// drivers/gpio/gpiolib-cdev.c <<< Here it goes to user space, no need to fix
drivers/pinctrl/actions/pinctrl-s500.c
drivers/pinctrl/mediatek/mtk-eint.c
drivers/pinctrl/mediatek/mtk-eint.h
drivers/pinctrl/nxp/pinctrl-s32cc.c
drivers/pinctrl/pinctrl-at91-pio4.c
// drivers/pinctrl/pinctrl-aw9523.c <<< Should be fixed in Linus' tree by me
drivers/pinctrl/pinctrl-ocelot.c
drivers/pinctrl/renesas/pinctrl-rzg2l.c
drivers/pinctrl/renesas/pinctrl-rzv2m.c
drivers/pinctrl/sunplus/sppctl.c
drivers/pinctrl/visconti/pinctrl-common.c

> Andy is one of the wisest men I know so I have taken out the patch.
> 
> Peng, what about fixing the problem at its source? Patch away,
> we will help you if need be.

Indeed.

-- 
With Best Regards,
Andy Shevchenko