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[62.78.225.252]) by smtp.gmail.com with ESMTPSA id c12-20020ac2530c000000b004f387d97dafsm565093lfh.147.2023.05.19.04.02.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 May 2023 04:02:20 -0700 (PDT) Date: Fri, 19 May 2023 14:02:16 +0300 From: Matti Vaittinen To: Matti Vaittinen , Matti Vaittinen Cc: Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , "Rafael J. Wysocki" , Wolfram Sang , Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , Andreas Klinger , Marcin Wojtas , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Jonathan =?iso-8859-1?q?Neusch=E4fer?= , Linus Walleij , Paul Cercueil , Akhil R , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org, linux-iio@vger.kernel.org, netdev@vger.kernel.org, openbmc@lists.ozlabs.org, linux-gpio@vger.kernel.org, linux-mips@vger.kernel.org Subject: [PATCH v5 4/8] pinctrl: wpcm450: relax return value check for IRQ get Message-ID: <42264f1b12a91e415ffa47ff9adb53f02a6aa3ea.1684493615.git.mazziesaccount@gmail.com> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org fwnode_irq_get[_byname]() were changed to not return 0 anymore. The special error case where device-tree based IRQ mapping fails can't no longer be reliably detected from this return value. This yields a functional change in the driver where the mapping failure is treated as an error. The mapping failure can occur for example when the device-tree IRQ information translation call-back(s) (xlate) fail, IRQ domain is not found, IRQ type conflicts, etc. In most cases this indicates an error in the device-tree and special handling is not really required. One more thing to note is that ACPI APIs do not return zero for any failures so this special handling did only apply on device-tree based systems. Drop the special (no error, just skip the IRQ) handling for DT mapping failures as these can no longer be separated from other errors at driver side. Signed-off-by: Matti Vaittinen Reviewed-by: Jonathan Neuschäfer Acked-by: Linus Walleij --- Revision history: v4 => v5: Fix typo in subject "elax" => "relax" Please note, I took Linus' reply to v4 cover-letter as ack && added the tag. Please let me know if this was not Ok. The special handling in this driver was added when fixing a problem where returning zero from fwnode_irq_get[_byname]() was treated as succes yielding zero being used as a valid IRQ by the driver. f4a31facfa80 ("pinctrl: wpcm450: Correct the fwnode_irq_get() return value check") The commit message does not mention if choosing not to abort the probe on device-tree mapping failure (as is done on other errors) was chosen because: a) Abort would have broken some existing setup. b) Because skipping an IRQ on failure is "the right thing to do", or c) because it sounded like a way to minimize risk of breaking something. If the reason is a) - then I'd appreciate receiving some more information and a suggestion how to proceed (if possible). If the reason is b), then it might be best to just skip the IRQ instead of aborting the probe for all errors on IRQ getting. Finally, in case of c), well, by acking this change you will now accept the risk :) The first patch of the series changes the fwnode_irq_get() so this depends on the first patch of the series and should not be applied alone. --- drivers/pinctrl/nuvoton/pinctrl-wpcm450.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c index 2d1c1652cfd9..f9326210b5eb 100644 --- a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c +++ b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c @@ -1106,8 +1106,6 @@ static int wpcm450_gpio_register(struct platform_device *pdev, irq = fwnode_irq_get(child, i); if (irq < 0) break; - if (!irq) - continue; girq->parents[i] = irq; girq->num_parents++;