From: Bjorn Helgaas <helgaas@kernel.org>
To: Marc Gonzalez <marc.w.gonzalez@free.fr>
Cc: Stephen Boyd <swboyd@chromium.org>,
LKML <linux-kernel@vger.kernel.org>,
PCI <linux-pci@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Lucas Stach <l.stach@pengutronix.de>,
Linus Walleij <linus.walleij@linaro.org>,
Mans Rullgard <mans@mansr.com>, Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH v6 31/57] pci: Remove dev_err() usage after platform_get_irq()
Date: Wed, 7 Aug 2019 17:08:37 -0500 [thread overview]
Message-ID: <20190807220837.GZ151852@google.com> (raw)
In-Reply-To: <fece42c0-f511-173a-b16a-5b1f3a1c1a4e@free.fr>
On Wed, Aug 07, 2019 at 04:09:10PM +0200, Marc Gonzalez wrote:
> On 30/07/2019 23:56, Bjorn Helgaas wrote:
>
> >> diff --git a/drivers/pci/controller/pcie-tango.c b/drivers/pci/controller/pcie-tango.c
> >> index 21a208da3f59..b87aa9041480 100644
> >> --- a/drivers/pci/controller/pcie-tango.c
> >> +++ b/drivers/pci/controller/pcie-tango.c
> >> @@ -273,10 +273,8 @@ static int tango_pcie_probe(struct platform_device *pdev)
> >> writel_relaxed(0, pcie->base + SMP8759_ENABLE + offset);
> >>
> >> virq = platform_get_irq(pdev, 1);
> >> - if (virq <= 0) {
> >> - dev_err(dev, "Failed to map IRQ\n");
> >> + if (virq <= 0)
> >> return -ENXIO;
> >
> > Why <= 0 and -ENXIO?
>
> Smirk. I remember discussing this in the past...
> Here it is:
>
> https://patchwork.kernel.org/patch/10006651/
Sigh, what a mess. I did say in that discussion that it wasn't worth
changing existing "irq <= 0" tests. I can't remember why I said that,
but I think I was wrong.
platform_get_irq() is a generic interface and we have to be able to
interpret return values consistently. The overwhelming consensus
among platform_get_irq() callers is to treat "irq < 0" as an error,
and I think we should follow suit.
> A) AFAIU platform_get_irq() = 0 signals an error.
>
> https://yarchive.net/comp/linux/zero.html
> https://lkml.org/lkml/2016/2/9/212
> https://patchwork.ozlabs.org/patch/486056/
>
> B) I don't remember why I picked ENXIO.
> Perhaps it made more sense to me (at the time) than EINVAL or ENODEV.
I think the best pattern is:
irq = platform_get_irq(pdev, i);
if (irq < 0)
return irq;
There's not an overwhelming consensus on whether to return the result
of platform_get_irq() or a hard-coded -ENXIO/-EINVAL/-ENODEV etc, but
why throw away information?
Bjorn
next prev parent reply other threads:[~2019-08-07 22:08 UTC|newest]
Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-30 18:15 [PATCH v6 00/57] Add error message to platform_get_irq*() Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 01/57] ata: Remove dev_err() usage after platform_get_irq() Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 02/57] bus: sunxi-rsb: " Stephen Boyd
2019-08-05 3:35 ` Chen-Yu Tsai
2019-08-05 20:44 ` Stephen Boyd
2019-08-06 6:20 ` Chen-Yu Tsai
2019-07-30 18:15 ` [PATCH v6 03/57] hwrng: " Stephen Boyd
2019-08-09 6:17 ` Herbert Xu
2019-07-30 18:15 ` [PATCH v6 04/57] clocksource: " Stephen Boyd
2019-08-08 7:47 ` Geert Uytterhoeven
2019-08-09 6:56 ` Daniel Lezcano
2019-07-30 18:15 ` [PATCH v6 05/57] crypto: " Stephen Boyd
2019-08-09 6:17 ` Herbert Xu
2019-07-30 18:15 ` [PATCH v6 06/57] cpufreq: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 07/57] ARM: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 08/57] MIPS: " Stephen Boyd
2019-08-26 11:05 ` Paul Burton
2019-07-30 18:15 ` [PATCH v6 09/57] devfreq: " Stephen Boyd
2019-07-31 0:21 ` Chanwoo Choi
2019-07-30 18:15 ` [PATCH v6 10/57] dmaengine: " Stephen Boyd
2019-07-31 15:28 ` Vinod Koul
2019-07-30 18:15 ` [PATCH v6 11/57] edac: " Stephen Boyd
2019-08-02 17:04 ` James Morse
2019-07-30 18:15 ` [PATCH v6 12/57] extcon: " Stephen Boyd
2019-07-31 0:20 ` Chanwoo Choi
2019-07-30 18:15 ` [PATCH v6 13/57] firmware: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 14/57] fpga: " Stephen Boyd
2019-08-31 20:55 ` Moritz Fischer
2019-07-30 18:15 ` [PATCH v6 15/57] gpio: " Stephen Boyd
2019-07-31 7:28 ` Bartosz Golaszewski
2019-08-05 11:26 ` Linus Walleij
2019-07-30 18:15 ` [PATCH v6 16/57] HSI: " Stephen Boyd
2019-07-30 20:44 ` Sebastian Reichel
2019-07-30 18:15 ` [PATCH v6 17/57] hwmon: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 18/57] i2c: " Stephen Boyd
2019-07-31 14:30 ` Wolfram Sang
2019-07-31 14:46 ` Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 19/57] iio: " Stephen Boyd
2019-07-31 6:42 ` Phil Reid
2019-07-31 14:32 ` Stephen Boyd
2019-08-01 2:37 ` Phil Reid
2019-08-05 15:01 ` Jonathan Cameron
2019-08-05 15:00 ` Jonathan Cameron
2019-07-30 18:15 ` [PATCH v6 20/57] infiniband: " Stephen Boyd
2019-07-31 15:53 ` Doug Ledford
2019-07-30 18:15 ` [PATCH v6 21/57] Input: " Stephen Boyd
2019-08-14 17:48 ` Dmitry Torokhov
2019-07-30 18:15 ` [PATCH v6 22/57] iommu: " Stephen Boyd
2019-08-09 15:33 ` Joerg Roedel
2019-07-30 18:15 ` [PATCH v6 23/57] irqchip: " Stephen Boyd
2019-08-07 14:23 ` Marc Zyngier
2019-07-30 18:15 ` [PATCH v6 24/57] mailbox: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 25/57] media: " Stephen Boyd
2019-08-08 7:56 ` Geert Uytterhoeven
2019-07-30 18:15 ` [PATCH v6 26/57] memory: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 27/57] mfd: " Stephen Boyd
2019-08-12 9:39 ` Lee Jones
2019-07-30 18:15 ` [PATCH v6 28/57] pcie-gadget-spear: " Stephen Boyd
2019-07-30 18:29 ` Arnd Bergmann
2019-07-31 14:16 ` Stephen Boyd
2019-08-05 16:05 ` Greg Kroah-Hartman
2019-07-30 18:15 ` [PATCH v6 29/57] mmc: " Stephen Boyd
2019-08-02 15:16 ` Ulf Hansson
2019-08-08 7:58 ` Geert Uytterhoeven
2019-07-30 18:15 ` [PATCH v6 30/57] mtd: " Stephen Boyd
2019-10-08 17:25 ` Miquel Raynal
2019-07-30 18:15 ` [PATCH v6 31/57] pci: " Stephen Boyd
2019-07-30 21:56 ` Bjorn Helgaas
2019-08-07 14:09 ` Marc Gonzalez
2019-08-07 22:08 ` Bjorn Helgaas [this message]
2019-08-08 8:02 ` Geert Uytterhoeven
2019-08-10 8:20 ` Linus Walleij
2019-07-30 18:15 ` [PATCH v6 32/57] perf: " Stephen Boyd
2019-07-31 8:40 ` Will Deacon
2019-07-31 14:07 ` Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 33/57] pinctrl: " Stephen Boyd
2019-08-05 11:24 ` Linus Walleij
2019-07-30 18:15 ` [PATCH v6 34/57] pinctrl: intel: " Stephen Boyd
2019-07-30 18:32 ` Andy Shevchenko
2019-08-01 13:57 ` Andy Shevchenko
2019-07-30 18:15 ` [PATCH v6 35/57] power: supply: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 36/57] pwm: " Stephen Boyd
2019-07-31 6:58 ` Uwe Kleine-König
2019-07-31 7:13 ` Greg Kroah-Hartman
2019-07-31 7:39 ` Uwe Kleine-König
2019-07-30 18:15 ` [PATCH v6 37/57] regulator: " Stephen Boyd
2019-08-02 11:22 ` Applied "regulator: Remove dev_err() usage after platform_get_irq()" to the regulator tree Mark Brown
2019-07-30 18:15 ` [PATCH v6 38/57] remoteproc: Remove dev_err() usage after platform_get_irq() Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 39/57] rtc: " Stephen Boyd
2019-08-08 8:05 ` Geert Uytterhoeven
2019-08-13 8:53 ` Alexandre Belloni
2019-07-30 18:15 ` [PATCH v6 40/57] soc: " Stephen Boyd
2019-07-30 18:35 ` Bjorn Andersson
2019-07-30 21:26 ` Leo Li
2019-07-30 21:36 ` Stephen Boyd
2019-07-31 18:50 ` Li Yang
2019-07-30 21:36 ` [PATCH v7 1/2] soc: fsl: qbman: " Stephen Boyd
2019-07-30 21:36 ` [PATCH v7 2/2] soc: qcom: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 41/57] spi: " Stephen Boyd
2019-08-02 11:22 ` Applied "spi: Remove dev_err() usage after platform_get_irq()" to the spi tree Mark Brown
2019-08-08 8:09 ` [PATCH v6 41/57] spi: Remove dev_err() usage after platform_get_irq() Geert Uytterhoeven
2019-07-30 18:15 ` [PATCH v6 42/57] staging: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 43/57] thermal: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 44/57] tty: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 45/57] uio: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 46/57] usb: " Stephen Boyd
2019-08-08 12:40 ` Felipe Balbi
2019-07-30 18:15 ` [PATCH v6 47/57] video: " Stephen Boyd
2020-01-03 11:29 ` Bartlomiej Zolnierkiewicz
2019-07-30 18:15 ` [PATCH v6 48/57] watchdog: " Stephen Boyd
2019-07-30 18:41 ` Guenter Roeck
2019-07-30 18:15 ` [PATCH v6 49/57] ASoC: " Stephen Boyd
2019-08-02 11:21 ` Applied "ASoC: Remove dev_err() usage after platform_get_irq()" to the asoc tree Mark Brown
2019-07-30 18:15 ` [PATCH v6 50/57] gpu: Remove dev_err() usage after platform_get_irq() Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 51/57] net: " Stephen Boyd
2019-07-30 21:25 ` David Miller
2019-07-30 18:15 ` [PATCH v6 52/57] platform/x86: intel_pmc_ipc: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 53/57] platform/mellanox: mlxreg-hotplug: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 54/57] platform/x86: intel_bxtwc_tmu: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 55/57] platform/x86: intel_int0002_vgpio: " Stephen Boyd
2019-08-01 15:11 ` Andy Shevchenko
2019-07-30 18:15 ` [PATCH v6 56/57] scsi: " Stephen Boyd
2019-07-30 18:15 ` [PATCH v6 57/57] ALSA: x86: " Stephen Boyd
2019-07-31 8:23 ` [PATCH v6 00/57] Add error message to platform_get_irq*() Markus Elfring
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