linux-kernel - Re: [PATCH] arch: x86: kernel: Add missing of_node_put() in x86

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Message-ID: <87zgdupn92.ffs@tglx>
Date:   Mon, 17 Oct 2022 15:56:25 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Liang He <windhl@....com>, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com
Cc:     jgg@...pe.ca, kirill.shutemov@...ux.intel.com,
        brijesh.singh@....com, linux-kernel@...r.kernel.org, windhl@....com
Subject: Re: [PATCH] arch: x86: kernel: Add missing of_node_put() in x86_init.c

Liang,

On Wed, Jun 15 2022 at 20:57, Liang He wrote:

please check https://www.kernel.org/doc/html/latest/process/maintainer-tip.html
for instructions vs. subject prefixes and changelogs.

> In x86_wallclock_init(), we need to use of_node_put() for the
> of_find_matching_node() which returns a node pointer with refcount
> incremented.
>
> Signed-off-by: Liang He <windhl@....com>
> ---
>  arch/x86/kernel/x86_init.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
> index e84ee5cdbd8c..81c071080efe 100644
> --- a/arch/x86/kernel/x86_init.c
> +++ b/arch/x86/kernel/x86_init.c
> @@ -50,6 +50,7 @@ static __init void x86_wallclock_init(void)
>  	struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
>  
>  	if (node && !of_device_is_available(node)) {
> +		of_node_put(node);
>  		x86_platform.get_wallclock = get_rtc_noop;
>  		x86_platform.set_wallclock = set_rtc_noop;
>  	}

That still leaks the node in the case when the device is available, no?

Thanks,

        tglx