linux-kernel - Re: [PATCH v6 4/8] pinctrl: wpcm450: relax return value check for IRQ get

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Message-ID: <20230528181750.599035ac@jic23-huawei>
Date:   Sun, 28 May 2023 18:17:50 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Matti Vaittinen <mazziesaccount@...il.com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Daniel Scally <djrscally@...il.com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Wolfram Sang <wsa@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Andreas Klinger <ak@...klinger.de>,
        Marcin Wojtas <mw@...ihalf.com>,
        Russell King <linux@...linux.org.uk>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Linus Walleij <linus.walleij@...aro.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Akhil R <akhilrajeev@...dia.com>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-iio@...r.kernel.org, netdev@...r.kernel.org,
        openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH v6 4/8] pinctrl: wpcm450: relax return value check for
 IRQ get

On Fri, 26 May 2023 09:38:05 +0300
Matti Vaittinen <mazziesaccount@...il.com> wrote:

> 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 <mazziesaccount@...il.com>
> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@....net>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>
> 
Seems fine

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
> Revision history:
> v5 => :
>  - No changes
> 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 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++;