Re: [PATCH v3 08/18] iio: adc: stm32: Simplify with dev_err_probe()

From: Krzysztof Kozlowski <krzk@kernel.org>
To: Jonathan Cameron <jic23@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Peter Rosin <peda@axentia.se>,
	Michael Hennerich <Michael.Hennerich@analog.com>,
	Marek Vasut <marek.vasut@gmail.com>,
	Tomasz Duszynski <tomasz.duszynski@octakon.com>,
	linux-iio@vger.kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	"linux-samsung-soc@vger.kernel.org" 
	<linux-samsung-soc@vger.kernel.org>,
	linux-amlogic@lists.infradead.org,
	linux-stm32@st-md-mailman.stormreply.com,
	Andy Shevchenko <andy.shevchenko@gmail.com>
Subject: Re: [PATCH v3 08/18] iio: adc: stm32: Simplify with dev_err_probe()
Date: Wed, 9 Sep 2020 21:57:41 +0200	[thread overview]
Message-ID: <CAJKOXPeo8SXWaRmiFG6z+t9jcnaSMRpvRPm2X22Rf6rtEeKVew@mail.gmail.com> (raw)
In-Reply-To: <20200909193600.41970d8c@archlinux>

On Wed, 9 Sep 2020 at 20:36, Jonathan Cameron <jic23@kernel.org> wrote:
>
> On Sat, 29 Aug 2020 08:47:16 +0200
> Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> > Common pattern of handling deferred probe can be simplified with
> > dev_err_probe().  Less code and also it prints the error value.
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> > Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
> >
> I don't have the thread to hand, but this tripped a warning next
> and the patch was dropped as a result. See below.

Thanks for letting me know. If you mean the warning caused by:
https://lore.kernel.org/lkml/20200909073716.GA560912@kroah.com/
then the driver-core patch was dropped, not the iio one:
https://lore.kernel.org/linux-next/20200909074130.GB561485@kroah.com/T/#t

So we are good here :)

Best regards,
Krzysztof

> Jonathan
> > ---
> >
> > Changes since v2:
> > 1. Wrap dev_err_probe() lines at 80 character
> >
> > Changes since v1:
> > 1. Convert to devm_clk_get_optional
> > 2. Update also stm32-dfsdm-core and stm32-dac-core.
> > 3. Wrap around 100 characters (accepted by checkpatch).
> > ---
> >  drivers/iio/adc/stm32-adc-core.c   | 75 ++++++++++--------------------
> >  drivers/iio/adc/stm32-adc.c        | 10 ++--
> >  drivers/iio/adc/stm32-dfsdm-adc.c  | 10 ++--
> >  drivers/iio/adc/stm32-dfsdm-core.c |  9 ++--
> >  drivers/iio/dac/stm32-dac-core.c   |  5 +-
> >  5 files changed, 35 insertions(+), 74 deletions(-)
> >
> > diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
> > index 0e2068ec068b..3f27b4817a42 100644
> > --- a/drivers/iio/adc/stm32-adc-core.c
> > +++ b/drivers/iio/adc/stm32-adc-core.c
> > @@ -582,11 +582,9 @@ static int stm32_adc_core_switches_probe(struct device *dev,
> >       priv->syscfg = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
> >       if (IS_ERR(priv->syscfg)) {
> >               ret = PTR_ERR(priv->syscfg);
> > -             if (ret != -ENODEV) {
> > -                     if (ret != -EPROBE_DEFER)
> > -                             dev_err(dev, "Can't probe syscfg: %d\n", ret);
> > -                     return ret;
> > -             }
> > +             if (ret != -ENODEV)
> > +                     return dev_err_probe(dev, ret, "Can't probe syscfg\n");
> > +
> >               priv->syscfg = NULL;
> >       }
> >
> > @@ -596,12 +594,9 @@ static int stm32_adc_core_switches_probe(struct device *dev,
> >               priv->booster = devm_regulator_get_optional(dev, "booster");
> >               if (IS_ERR(priv->booster)) {
> >                       ret = PTR_ERR(priv->booster);
> > -                     if (ret != -ENODEV) {
> > -                             if (ret != -EPROBE_DEFER)
> > -                                     dev_err(dev, "can't get booster %d\n",
> > -                                             ret);
> > -                             return ret;
> > -                     }
> > +                     if (ret != -ENODEV)
> > +                             dev_err_probe(dev, ret, "can't get booster\n");
>
> This tripped a warning and got the patch dropped because we no longer
> return on error.