linux-kernel - Re: [PATCH v3] driver core: platform: Add an error message to platform_get

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Message-ID: <CAJZ5v0iL_Fq0RUbLjMj9WBitDw2amNV_ybirkiPbuYb0zroGAg@mail.gmail.com>
Date:   Thu, 3 Jan 2019 10:40:26 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Rob Herring <robh@...nel.org>, Andrzej Hajda <a.hajda@...sung.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Mark Brown <broonie@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        javierm@...hat.com,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v3] driver core: platform: Add an error message to platform_get_irq*()

On Wed, Jan 2, 2019 at 7:51 PM Stephen Boyd <swboyd@...omium.org> wrote:
>
> A grep of the kernel shows that many drivers print an error message if
> they fail to get the irq they're looking for. Furthermore, those drivers
> all decide to print the device name, or not, and the irq they were
> requesting, or not, etc. Let's consolidate all these error messages into
> the API itself, allowing us to get rid of the error messages in each
> driver.
>
> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> ---
>
> Changes from v2:
>  * Don't refactor platform_get_irq(), just wrap it
>
> Changes from v1:
>  * Update error text to indicate irq index instead of IRQn, use %u
>
>  drivers/base/platform.c | 31 +++++++++++++++++++++++--------
>  1 file changed, 23 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index 1c958eb33ef4..388461306dd4 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -79,12 +79,7 @@ struct resource *platform_get_resource(struct platform_device *dev,
>  }
>  EXPORT_SYMBOL_GPL(platform_get_resource);
>
> -/**
> - * platform_get_irq - get an IRQ for a device
> - * @dev: platform device
> - * @num: IRQ number index
> - */
> -int platform_get_irq(struct platform_device *dev, unsigned int num)
> +static int __platform_get_irq(struct platform_device *dev, unsigned int num)
>  {
>  #ifdef CONFIG_SPARC
>         /* sparc does not have irqs represented as IORESOURCE_IRQ resources */
> @@ -130,6 +125,22 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
>         return r ? r->start : -ENXIO;
>  #endif
>  }
> +
> +/**
> + * platform_get_irq - get an IRQ for a device
> + * @dev: platform device
> + * @num: IRQ number index
> + */
> +int platform_get_irq(struct platform_device *dev, unsigned int num)
> +{
> +       int ret;
> +
> +       ret = __platform_get_irq(dev, num);
> +       if (ret < 0 && ret != -EPROBE_DEFER)
> +               dev_err(&dev->dev, "IRQ index %u not found\n", num);

Why don't you log the error code too?

> +
> +       return ret;
> +}
>  EXPORT_SYMBOL_GPL(platform_get_irq);
>
>  /**
> @@ -142,7 +153,7 @@ int platform_irq_count(struct platform_device *dev)
>  {
>         int ret, nr = 0;
>
> -       while ((ret = platform_get_irq(dev, nr)) >= 0)
> +       while ((ret = __platform_get_irq(dev, nr)) >= 0)
>                 nr++;
>
>         if (ret == -EPROBE_DEFER)
> @@ -195,7 +206,11 @@ int platform_get_irq_byname(struct platform_device *dev, const char *name)
>         }
>
>         r = platform_get_resource_byname(dev, IORESOURCE_IRQ, name);
> -       return r ? r->start : -ENXIO;
> +       if (r)
> +               return r->start;
> +
> +       dev_err(&dev->dev, "IRQ %s not found\n", name);
> +       return -ENXIO;
>  }
>  EXPORT_SYMBOL_GPL(platform_get_irq_byname);
>
> --
> Sent by a computer through tubes
>