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From: Lee Jones <lee.jones@linaro.org>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Michael Walle <michael@walle.cc>,
	linux-gpio@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org,
	linux-pwm@vger.kernel.org, linux-watchdog@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <bgolaszewski@baylibre.com>,
	Rob Herring <robh+dt@kernel.org>,
	Jean Delvare <jdelvare@suse.com>,
	Guenter Roeck <linux@roeck-us.net>,
	Thierry Reding <thierry.reding@gmail.com>,
	Wim Van Sebroeck <wim@linux-watchdog.org>,
	Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>,
	Marc Zyngier <maz@kernel.org>, Mark Brown <broonie@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Pavel Machek <pavel@ucw.cz>
Subject: Re: [PATCH v6 06/13] pwm: add support for sl28cpld PWM controller
Date: Tue, 28 Jul 2020 11:51:21 +0100
Message-ID: <20200728105121.GG2419169@dell> (raw)
In-Reply-To: <20200728094720.x6pucwxsfwvz6nvv@pengutronix.de>

On Tue, 28 Jul 2020, Uwe Kleine-König wrote:
> On Tue, Jul 28, 2020 at 10:21:22AM +0200, Michael Walle wrote:
> > Am 2020-07-28 09:43, schrieb Uwe Kleine-König:
> > > On Sun, Jul 26, 2020 at 01:18:27AM +0200, Michael Walle wrote:
> > > > +static int sl28cpld_pwm_probe(struct platform_device *pdev)
> > > > +{
> > > > +	struct sl28cpld_pwm *priv;
> > > > +	struct pwm_chip *chip;
> > > > +	int ret;
> > > > +
> > > > +	if (!pdev->dev.parent)
> > > > +		return -ENODEV;
> > > > +
> > > > +	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
> > > > +	if (!priv)
> > > > +		return -ENOMEM;
> > > > +
> > > > +	priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
> > > > +	if (!priv->regmap)
> > > 
> > > Error message here?
> > 
> > This shouldn't really happen and I put it into the same category
> > as the two above and report no error. But I can add it.
> 
> For kzalloc it is right to not emit an error because a failing kzalloc
> is already loud on its own. I missed the first error path, that should
> get a message, too.
> 
> > Generally, it looked to me that more and more drivers don't
> > really report errors anymore, but just return with an -EWHATEVER.
> > So if someone can shed some light here, I'm all ears.
> 
> IMHO it's wrong not to add error messages. At one point in time it will
> fail and then you're happy if you don't have to add printks all over the
> place first to debug that.

Error messages should only be omitted for -ENOMEM and if something is
already being printed out, ideally by the sub-system API.

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog

  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-25 23:18 [PATCH v6 00/13] Add support for Kontron sl28cpld Michael Walle
2020-07-25 23:18 ` [PATCH v6 01/13] mfd: add simple regmap based I2C driver Michael Walle
2020-07-28  7:19   ` Lee Jones
2020-07-28  7:42     ` Michael Walle
2020-07-28  8:15       ` Lee Jones
2020-07-28  8:27         ` Michael Walle
2020-07-28  8:35           ` Lee Jones
2020-07-25 23:18 ` [PATCH v6 02/13] dt-bindings: mfd: Add bindings for sl28cpld Michael Walle
2020-07-28  7:24   ` Lee Jones
2020-07-28  7:57     ` Michael Walle
2020-07-28  8:27       ` Lee Jones
2020-07-28  8:38         ` Michael Walle
2020-07-28  8:56           ` Lee Jones
2020-07-28  9:06             ` Michael Walle
2020-07-28  9:20               ` Lee Jones
2020-07-28  9:39                 ` Michael Walle
2020-07-25 23:18 ` [PATCH v6 03/13] mfd: simple-mfd-i2c: add sl28cpld support Michael Walle
2020-07-28  7:25   ` Lee Jones
2020-07-25 23:18 ` [PATCH v6 04/13] irqchip: add sl28cpld interrupt controller support Michael Walle
2020-07-25 23:18 ` [PATCH v6 05/13] watchdog: add support for sl28cpld watchdog Michael Walle
2020-07-25 23:18 ` [PATCH v6 06/13] pwm: add support for sl28cpld PWM controller Michael Walle
2020-07-27  7:30   ` Thierry Reding
2020-07-28  7:43   ` Uwe Kleine-König
2020-07-28  8:21     ` Michael Walle
2020-07-28  9:47       ` Uwe Kleine-König
2020-07-28 10:51         ` Lee Jones [this message]
2020-07-25 23:18 ` [PATCH v6 07/13] gpio: add support for the sl28cpld GPIO controller Michael Walle
2020-07-26  9:16   ` Andy Shevchenko
2020-07-25 23:18 ` [PATCH v6 08/13] hwmon: add support for the sl28cpld hardware monitoring controller Michael Walle
2020-07-26  9:18   ` Andy Shevchenko
2020-07-25 23:18 ` [PATCH v6 09/13] arm64: dts: freescale: sl28: enable sl28cpld Michael Walle
2020-07-25 23:18 ` [PATCH v6 10/13] arm64: dts: freescale: sl28: map GPIOs to input events Michael Walle
2020-07-25 23:18 ` [PATCH v6 11/13] arm64: dts: freescale: sl28: enable LED support Michael Walle
2020-07-25 23:18 ` [PATCH v6 12/13] arm64: dts: freescale: sl28: enable fan support Michael Walle
2020-07-25 23:18 ` [PATCH v6 13/13] arm64: defconfig: enable the sl28cpld board management controller Michael Walle

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