linux-kernel - Re: [PATCH] Input: bbnsm_pwrkey

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Message-ID: <4fada863-b125-454d-97d0-efbf44ec3bc8@wanadoo.fr>
Date: Fri, 1 Nov 2024 11:17:32 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>, dmitry.torokhov@...il.com
Cc: Frank.Li@....com, ping.bai@....com, linux-input@...r.kernel.org,
 linux-kernel@...r.kernel.org, Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] Input: bbnsm_pwrkey - add remove hook

Le 01/11/2024 à 11:12, Peng Fan (OSS) a écrit :
> From: Peng Fan <peng.fan@....com>
> 
> Without remove hook to clear wake irq, there will be kernel dump when
> doing module test.
> "bbnsm_pwrkey 44440000.bbnsm:pwrkey: wake irq already initialized"
> 
> Add remove hook to clear wake irq and set wakeup to false.
> 
> Fixes: 40e40fdfec3f ("Input: bbnsm_pwrkey - add bbnsm power key support")
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>   drivers/input/misc/nxp-bbnsm-pwrkey.c | 13 +++++++++++++
>   1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/input/misc/nxp-bbnsm-pwrkey.c b/drivers/input/misc/nxp-bbnsm-pwrkey.c
> index eb4173f9c820..847964f7ebdd 100644
> --- a/drivers/input/misc/nxp-bbnsm-pwrkey.c
> +++ b/drivers/input/misc/nxp-bbnsm-pwrkey.c
> @@ -187,6 +187,17 @@ static int bbnsm_pwrkey_probe(struct platform_device *pdev)
>   	return 0;
>   }
>   
> +static void bbnsm_pwrkey_remove(struct platform_device *pdev)
> +{
> +	struct bbnsm_pwrkey *bbnsm = platform_get_drvdata(pdev);
> +
> +	dev_pm_clear_wake_irq(&pdev->dev);
> +	device_init_wakeup(&pdev->dev, false);
> +
> +	if (bbnsm)

IIUC, no need to test, if the remove function is called, this can't be NULL.

> +		input_unregister_device(bbnsm->input);
> +}
> +
>   static int __maybe_unused bbnsm_pwrkey_suspend(struct device *dev)
>   {
>   	struct platform_device *pdev = to_platform_device(dev);
> @@ -223,6 +234,8 @@ static struct platform_driver bbnsm_pwrkey_driver = {
>   		.of_match_table = bbnsm_pwrkey_ids,
>   	},
>   	.probe = bbnsm_pwrkey_probe,
> +	.remove_new = bbnsm_pwrkey_remove,

I think that .remove should be used here instead.
(see 
https://elixir.bootlin.com/linux/v6.12-rc5/source/include/linux/platform_device.h#L240) 


> +
>   };
>   module_platform_driver(bbnsm_pwrkey_driver);
>   

CJ