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Date: Wed, 19 Jan 2022 20:58:07 +0200 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Uwe Kleine-König <u.kleine-koenig@...gutronix.de> Cc: Sergey Shtylyov <s.shtylyov@....ru>, Andrew Lunn <andrew@...n.ch>, Ulf Hansson <ulf.hansson@...aro.org>, Vignesh Raghavendra <vigneshr@...com>, KVM list <kvm@...r.kernel.org>, "Rafael J. Wysocki" <rafael@...nel.org>, linux-iio@...r.kernel.org, Linus Walleij <linus.walleij@...aro.org>, Amit Kucheria <amitk@...nel.org>, ALSA Development Mailing List <alsa-devel@...a-project.org>, Jaroslav Kysela <perex@...ex.cz>, Guenter Roeck <groeck@...omium.org>, Thierry Reding <thierry.reding@...il.com>, MTD Maling List <linux-mtd@...ts.infradead.org>, Linux I2C <linux-i2c@...r.kernel.org>, "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>, Miquel Raynal <miquel.raynal@...tlin.com>, linux-phy@...ts.infradead.org, netdev@...r.kernel.org, linux-spi <linux-spi@...r.kernel.org>, Jiri Slaby <jirislaby@...nel.org>, Khuong Dinh <khuong@...amperecomputing.com>, Florian Fainelli <f.fainelli@...il.com>, Matthias Schiffer <matthias.schiffer@...tq-group.com>, Kamal Dasu <kdasu.kdev@...il.com>, Lee Jones <lee.jones@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>, Daniel Lezcano <daniel.lezcano@...aro.org>, Kishon Vijay Abraham I <kishon@...com>, Geert Uytterhoeven <geert@...ux-m68k.org>, "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>, bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>, Zhang Rui <rui.zhang@...el.com>, platform-driver-x86@...r.kernel.org, Linux PWM List <linux-pwm@...r.kernel.org>, Robert Richter <rric@...nel.org>, Saravanan Sekar <sravanhome@...il.com>, Corey Minyard <minyard@....org>, Linux PM list <linux-pm@...r.kernel.org>, Liam Girdwood <lgirdwood@...il.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, John Garry <john.garry@...wei.com>, Takashi Iwai <tiwai@...e.com>, Peter Korsgaard <peter@...sgaard.com>, William Breathitt Gray <vilhelm.gray@...il.com>, Mark Gross <markgross@...nel.org>, Hans de Goede <hdegoede@...hat.com>, Alex Williamson <alex.williamson@...hat.com>, Mark Brown <broonie@...nel.org>, Borislav Petkov <bp@...en8.de>, Jakub Kicinski <kuba@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>, openipmi-developer@...ts.sourceforge.net, Benson Leung <bleung@...omium.org>, Pengutronix Kernel Team <kernel@...gutronix.de>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, linux-edac@...r.kernel.org, Tony Luck <tony.luck@...el.com>, Richard Weinberger <richard@....at>, Mun Yew Tham <mun.yew.tham@...el.com>, Eric Auger <eric.auger@...hat.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, Cornelia Huck <cohuck@...hat.com>, Linux MMC List <linux-mmc@...r.kernel.org>, Joakim Zhang <qiangqing.zhang@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Linux-Renesas <linux-renesas-soc@...r.kernel.org>, Vinod Koul <vkoul@...nel.org>, James Morse <james.morse@....com>, Zha Qipeng <qipeng.zha@...el.com>, Sebastian Reichel <sre@...nel.org>, Niklas Söderlund <niklas.soderlund@...natech.se>, linux-mediatek@...ts.infradead.org, Brian Norris <computersforpeace@...il.com>, "David S. Miller" <davem@...emloft.net> Subject: Re: [PATCH 1/2] platform: make platform_get_irq_optional() optional On Mon, Jan 17, 2022 at 09:47:32AM +0100, Uwe Kleine-König wrote: > On Sun, Jan 16, 2022 at 09:15:20PM +0300, Sergey Shtylyov wrote: ... > Because with your change we have: > > - < 0 -> error > - == 0 -> no irq > - > 0 -> irq > > For my part I'd say this doesn't justify the change, but at least I > could better life with the reasoning. If you start at: > > irq = platform_get_irq_optional(...) > if (irq < 0 && irq != -ENXIO) > return irq > else if (irq > 0) > setup_irq(irq); > else > setup_polling() > > I'd change that to > > irq = platform_get_irq_optional(...) > if (irq > 0) /* or >= 0 ? */ > setup_irq(irq) > else if (irq == -ENXIO) > setup_polling() > else > return irq > > This still has to mention -ENXIO, but this is ok and checking for 0 just > hardcodes a different return value. It's what we are against of. The idea is to have irq = platform_get_irq_optional(...) if (irq < 0) // we do not care about special cookies here return irq; if (irq) setup_irq(irq) else setup_polling() See the difference? Your code is convoluted. > Anyhow, I think if you still want to change platform_get_irq_optional > you should add a few patches converting some drivers which demonstrates > the improvement for the callers. -- With Best Regards, Andy Shevchenko
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