linux-kernel - Re: [PATCH v1] gpio: mpc8xxx: Add shutdown function.

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Date:   Wed, 8 Apr 2020 11:55:30 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Hui Song <hui.song_1@....com>
Cc:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v1] gpio: mpc8xxx: Add shutdown function.

On Wed, Apr 08, 2020 at 06:21:17PM +0800, Hui Song wrote:
> From: Song Hui <hui.song_1@....com>
> 
> The shutdown function needed to make interrupt handler to be NULL
> when kexec execute.
> 
> Signed-off-by: Song Hui <hui.song_1@....com>

Please improve the commit message.  You describe what change the patch
is making (which we can see from reading the patch), but you don't
explain why it is necessary, or really what problem the patch is
solving.  I'm not aware of other implementations needing this for
kexec to work.

Thanks.

> ---
>  drivers/gpio/gpio-mpc8xxx.c | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
> 
> diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
> index 604dfec..a24e6c5 100644
> --- a/drivers/gpio/gpio-mpc8xxx.c
> +++ b/drivers/gpio/gpio-mpc8xxx.c
> @@ -446,9 +446,21 @@ static int mpc8xxx_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static int mpc8xxx_shutdown(struct platform_device *pdev)
> +{
> +	struct mpc8xxx_gpio_chip *mpc8xxx_gc = platform_get_drvdata(pdev);
> +
> +	if (mpc8xxx_gc->irq) {
> +		irq_set_chained_handler_and_data(mpc8xxx_gc->irqn, NULL, NULL);
> +		irq_domain_remove(mpc8xxx_gc->irq);
> +	}
> +
> +	return 0;
> +}
>  static struct platform_driver mpc8xxx_plat_driver = {
>  	.probe		= mpc8xxx_probe,
>  	.remove		= mpc8xxx_remove,
> +	.shutdown	= mpc8xxx_shutdown,
>  	.driver		= {
>  		.name = "gpio-mpc8xxx",
>  		.of_match_table	= mpc8xxx_gpio_ids,
> -- 
> 2.9.5
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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