linux-kernel - Re: [PATCH] powerpc: kernel: Change the order of of_node

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Date:   Sat, 18 Jun 2022 07:13:13 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Liang He <windhl@....com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "rppt@...nel.org" <rppt@...nel.org>,
        "wangkefeng.wang@...wei.com" <wangkefeng.wang@...wei.com>,
        "gpiccoli@...lia.com" <gpiccoli@...lia.com>,
        "aneesh.kumar@...ux.ibm.com" <aneesh.kumar@...ux.ibm.com>,
        "dmitry.osipenko@...labora.com" <dmitry.osipenko@...labora.com>
CC:     "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] powerpc: kernel: Change the order of of_node_put()



Le 17/06/2022 à 13:26, Liang He a écrit :
> In add_pcspkr(), it is better to call of_node_put() after the
> 'if(!np)' check.

Why is it better ?



/**
  * of_node_put() - Decrement refcount of a node
  * @node:	Node to dec refcount, NULL is supported to simplify writing of
  *		callers
  */
void of_node_put(struct device_node *node)
{
	if (node)
		kobject_put(&node->kobj);
}
EXPORT_SYMBOL(of_node_put);



Christophe


> 
> Signed-off-by: Liang He <windhl@....com>
> ---
>   arch/powerpc/kernel/setup-common.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c
> index eb0077b302e2..761817d1f4db 100644
> --- a/arch/powerpc/kernel/setup-common.c
> +++ b/arch/powerpc/kernel/setup-common.c
> @@ -563,9 +563,9 @@ static __init int add_pcspkr(void)
>   	int ret;
>   
>   	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
> -	of_node_put(np);
>   	if (!np)
>   		return -ENODEV;
> +	of_node_put(np);
>   
>   	pd = platform_device_alloc("pcspkr", -1);
>   	if (!pd)