linux-kernel - Re: [PATCH v7 1/5] leds: flash: Add flash registration with undefined CONFIG_LEDS_CLASS

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Message-ID: <3164b1ed-9e47-88cd-d492-ff5a9243e5ef@gmail.com>
Date:   Thu, 19 Nov 2020 23:29:36 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Gene Chen <gene.chen.richtek@...il.com>, pavel@....cz,
        robh+dt@...nel.org, matthias.bgg@...il.com
Cc:     dmurphy@...com, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        gene_chen@...htek.com, Wilma.Wu@...iatek.com,
        shufan_lee@...htek.com, cy_huang@...htek.com,
        benjamin.chao@...iatek.com
Subject: Re: [PATCH v7 1/5] leds: flash: Add flash registration with undefined
 CONFIG_LEDS_CLASS_FLASH

Hi Gene,

On 11/18/20 11:47 AM, Gene Chen wrote:
> From: Gene Chen <gene_chen@...htek.com>
> 
> Add flash registration with undefined CONFIG_LEDS_CLASS_FLASH
> 
> Signed-off-by: Gene Chen <gene_chen@...htek.com>
> ---
>   include/linux/led-class-flash.h | 36 ++++++++++++++++++++++++++++++++++++
>   1 file changed, 36 insertions(+)
> 
> diff --git a/include/linux/led-class-flash.h b/include/linux/led-class-flash.h
> index 21a3358..4f56c28 100644
> --- a/include/linux/led-class-flash.h
> +++ b/include/linux/led-class-flash.h
> @@ -85,6 +85,7 @@ static inline struct led_classdev_flash *lcdev_to_flcdev(
>   	return container_of(lcdev, struct led_classdev_flash, led_cdev);
>   }
>   
> +#if IS_ENABLED(CONFIG_LEDS_CLASS_FLASH)
>   /**
>    * led_classdev_flash_register_ext - register a new object of LED class with
>    *				     init data and with support for flash LEDs
> @@ -127,6 +128,41 @@ static inline int devm_led_classdev_flash_register(struct device *parent,
>   void devm_led_classdev_flash_unregister(struct device *parent,
>   					struct led_classdev_flash *fled_cdev);
>   
> +#else
> +
> +static inline int led_classdev_flash_register_ext(struct device *parent,
> +				    struct led_classdev_flash *fled_cdev,
> +				    struct led_init_data *init_data)
> +{
> +	return -EINVAL;

s/-EINVAL/0/

The goal here is to assure that client will not fail when using no-op.

> +}
> +
> +static inline int led_classdev_flash_register(struct device *parent,
> +					   struct led_classdev_flash *fled_cdev)
> +{
> +	return led_classdev_flash_register_ext(parent, fled_cdev, NULL);
> +}

This function should be placed after #ifdef block because its
shape is the same for both cases.

> +static inline void led_classdev_flash_unregister(struct led_classdev_flash *fled_cdev) {};
> +static inline int devm_led_classdev_flash_register_ext(struct device *parent,
> +				     struct led_classdev_flash *fled_cdev,
> +				     struct led_init_data *init_data)
> +{
> +	return -EINVAL;

/-EINVAL/0/

Please do the same fix in all no-ops in the led-class-multicolor.h,
as we've discussed.

> +}
> +
> +static inline int devm_led_classdev_flash_register(struct device *parent,
> +				     struct led_classdev_flash *fled_cdev)
> +{
> +	return devm_led_classdev_flash_register_ext(parent, fled_cdev, NULL);
> +}


This function should also be placed after #ifdef block.
Please make the same optimizations in the led-class-multicolor.h as you
are at it.

> +
> +void devm_led_classdev_flash_unregister(struct device *parent,

s/void/static inline void/

That's the reason why you got warning from buildbot.

> +					struct led_classdev_flash *fled_cdev)
> +{};
> +
> +#endif  /* IS_ENABLED(CONFIG_LEDS_CLASS_FLASH) */
> +
>   /**
>    * led_set_flash_strobe - setup flash strobe
>    * @fled_cdev: the flash LED to set strobe on
> 

-- 
Best regards,
Jacek Anaszewski