linux-kernel - Re: [PATCH] rtc: bbnsm: add remove hook

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Message-ID: <f22fc806-7816-4da9-8cac-a84db22d96fd@wanadoo.fr>
Date: Fri, 1 Nov 2024 11:12:30 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>,
 Alexandre Belloni <alexandre.belloni@...tlin.com>,
 Jacky Bai <ping.bai@....com>, Peng Fan <peng.fan@....com>,
 "open list:REAL TIME CLOCK (RTC) SUBSYSTEM" <linux-rtc@...r.kernel.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rtc: bbnsm: add remove hook

Le 01/11/2024 à 11:10, 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_rtc 44440000.bbnsm:rtc: wake irq already initialized"
> 
> Add remove hook to clear wake irq and set wakeup to false.
> 
> Fixes: eb7b85853c38 ("rtc: bbnsm: Add the bbnsm rtc support")
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>   drivers/rtc/rtc-nxp-bbnsm.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/rtc/rtc-nxp-bbnsm.c b/drivers/rtc/rtc-nxp-bbnsm.c
> index acbfbeb8b070..fa88fd8ffadf 100644
> --- a/drivers/rtc/rtc-nxp-bbnsm.c
> +++ b/drivers/rtc/rtc-nxp-bbnsm.c
> @@ -206,6 +206,12 @@ static int bbnsm_rtc_probe(struct platform_device *pdev)
>   	return devm_rtc_register_device(bbnsm->rtc);
>   }
>   
> +static void bbnsm_rtc_remove(struct platform_device *pdev)
> +{
> +	dev_pm_clear_wake_irq(&pdev->dev);
> +	device_init_wakeup(&pdev->dev, false);

I think that an error handling path in the probe should also be added 
with such calls.

> +}
> +
>   static const struct of_device_id bbnsm_dt_ids[] = {
>   	{ .compatible = "nxp,imx93-bbnsm-rtc" },
>   	{ /* sentinel */ },
> @@ -218,6 +224,7 @@ static struct platform_driver bbnsm_rtc_driver = {
>   		.of_match_table = bbnsm_dt_ids,
>   	},
>   	.probe = bbnsm_rtc_probe,
> +	.remove_new = bbnsm_rtc_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_rtc_driver);
>   

CJ