linux-kernel - Re: [PATCH V2] rtc: bbnsm: add remove hook

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <202411102232429e48d10c@mail.local>
Date: Sun, 10 Nov 2024 23:32:42 +0100
From: Alexandre Belloni <alexandre.belloni@...tlin.com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: 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>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: Re: [PATCH V2] rtc: bbnsm: add remove hook

On 04/11/2024 11:15:12+0800, Peng Fan (OSS) wrote:
> 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")
> Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> 
> V2:
>  Per Christophe JAILLET
>   Use remove, not remove_new
>   Fix error handling in probe
> 
>  drivers/rtc/rtc-nxp-bbnsm.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-nxp-bbnsm.c b/drivers/rtc/rtc-nxp-bbnsm.c
> index acbfbeb8b070..31225baddadf 100644
> --- a/drivers/rtc/rtc-nxp-bbnsm.c
> +++ b/drivers/rtc/rtc-nxp-bbnsm.c
> @@ -197,13 +197,30 @@ static int bbnsm_rtc_probe(struct platform_device *pdev)
>  	if (ret) {
>  		dev_err(&pdev->dev, "failed to request irq %d: %d\n",
>  			bbnsm->irq, ret);
> -		return ret;
> +		goto err;
>  	}
>  
>  	bbnsm->rtc->ops = &bbnsm_rtc_ops;
>  	bbnsm->rtc->range_max = U32_MAX;
>  
> -	return devm_rtc_register_device(bbnsm->rtc);
> +	ret = devm_rtc_register_device(bbnsm->rtc);
> +	if (ret) {
> +		dev_err(&pdev->dev, "failed to register rtc :%d\n", ret);

No extra error message, all the failing paths of
devm_rtc_register_device already have one.

> +		goto err;
> +	}
> +
> +	return 0;
> +
> +err:
> +	dev_pm_clear_wake_irq(&pdev->dev);
> +	device_init_wakeup(&pdev->dev, false);
> +	return ret;
> +}
> +
> +static void bbnsm_rtc_remove(struct platform_device *pdev)
> +{
> +	dev_pm_clear_wake_irq(&pdev->dev);
> +	device_init_wakeup(&pdev->dev, false);
>  }
>  
>  static const struct of_device_id bbnsm_dt_ids[] = {
> @@ -218,6 +235,7 @@ static struct platform_driver bbnsm_rtc_driver = {
>  		.of_match_table = bbnsm_dt_ids,
>  	},
>  	.probe = bbnsm_rtc_probe,
> +	.remove = bbnsm_rtc_remove,
>  };
>  module_platform_driver(bbnsm_rtc_driver);
>  
> -- 
> 2.37.1
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com