linux-kernel - Re: [PATCH] mips: lantiq: Add missing of_node

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Message-ID: <20220621152119.GB12322@alpha.franken.de>
Date:   Tue, 21 Jun 2022 17:21:19 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Liang He <windhl@....com>
Cc:     john@...ozen.org, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mips: lantiq: Add missing of_node_put() in irq.c

On Wed, Jun 15, 2022 at 11:33:39PM +0800, Liang He wrote:
> In icu_of_init(), of_find_compatible_node() will return a node
> pointer with refcount incremented. We should use of_node_put()
> when it is not used anymore.
> 
> Signed-off-by: Liang He <windhl@....com>
> ---
>  arch/mips/lantiq/irq.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/arch/mips/lantiq/irq.c b/arch/mips/lantiq/irq.c
> index b732495f138a..62f1b20a2169 100644
> --- a/arch/mips/lantiq/irq.c
> +++ b/arch/mips/lantiq/irq.c
> @@ -396,6 +396,9 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent)
>  
>  		ret = of_property_read_u32_array(eiu_node, "lantiq,eiu-irqs",
>  						ltq_eiu_irq, exin_avail);
> +						

trailing whitespaces

> +		of_node_put(eiu_node);
> +						

trailing whitespaces

>  		if (ret)
>  			panic("failed to load external irq resources");
>  
> @@ -409,6 +412,9 @@ int __init icu_of_init(struct device_node *node, struct device_node *parent)
>  			panic("Failed to remap eiu memory");
>  	}
>  
> +	/* if eiu_node&of_address_to_resource */
> +	of_node_put(eiu_node);
> +

if I'm not mistaken you are freeing the taken reference twice. Shouldn't
it work by only adding the last of_node_put() ?

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]