linux-kernel - Re: [RFT PATCH 1/3] gpio: eic-sprd: unregister from the irq notifier on remove()

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Date:   Tue, 12 Sep 2023 19:02:37 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andy Shevchenko <andy@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFT PATCH 1/3] gpio: eic-sprd: unregister from the irq notifier
 on remove()



On 9/12/2023 5:45 PM, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> This is a tristate module, it can be unloaded. We need to cleanup properly
> and unregister from the interrupt notifier on driver detach.
> 
> Fixes: b32415652a4d ("gpio: eic-sprd: use atomic notifiers to notify all chips about irqs")
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

LGTM.
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
>   drivers/gpio/gpio-eic-sprd.c | 19 +++++++++++++++++--
>   1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-eic-sprd.c b/drivers/gpio/gpio-eic-sprd.c
> index 21a1afe358d6..9b2f9ccf8d77 100644
> --- a/drivers/gpio/gpio-eic-sprd.c
> +++ b/drivers/gpio/gpio-eic-sprd.c
> @@ -580,6 +580,14 @@ static const struct irq_chip sprd_eic_irq = {
>   	.flags		= IRQCHIP_SKIP_SET_WAKE | IRQCHIP_IMMUTABLE,
>   	GPIOCHIP_IRQ_RESOURCE_HELPERS,
>   };
> +
> +static void sprd_eic_unregister_notifier(void *data)
> +{
> +	struct notifier_block *nb = data;
> +
> +	atomic_notifier_chain_unregister(&sprd_eic_irq_notifier, nb);
> +}
> +
>   static int sprd_eic_probe(struct platform_device *pdev)
>   {
>   	const struct sprd_eic_variant_data *pdata;
> @@ -658,8 +666,15 @@ static int sprd_eic_probe(struct platform_device *pdev)
>   	}
>   
>   	sprd_eic->irq_nb.notifier_call = sprd_eic_irq_notify;
> -	return atomic_notifier_chain_register(&sprd_eic_irq_notifier,
> -					      &sprd_eic->irq_nb);
> +	ret = atomic_notifier_chain_register(&sprd_eic_irq_notifier,
> +					     &sprd_eic->irq_nb);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "Failed to register with the interrupt notifier");
> +
> +	return devm_add_action_or_reset(&pdev->dev,
> +					sprd_eic_unregister_notifier,
> +					&sprd_eic->irq_nb);
>   }
>   
>   static const struct of_device_id sprd_eic_of_match[] = {