linux-kernel - Re: [PATCH v2] arm: mach-spear: Add missing of_node

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Message-ID: <20220616095156.clyiogsvrxbmyrd6@vireshk-i7>
Date:   Thu, 16 Jun 2022 15:21:56 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Liang He <windhl@....com>
Cc:     vireshk@...nel.org, shiraz.linux.kernel@...il.com, soc@...nel.org,
        linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm: mach-spear: Add missing of_node_put() in time.c

On 16-06-22, 17:30, Liang He wrote:
> In spear_setup_of_timer(), of_find_matching_node() will return a
> node pointer with refcount incrementd. We should use of_node_put()
> in each fail path or when it is not used anymore.
> 
> Signed-off-by: Liang He <windhl@....com>
> ---
>  changelog:
>  
>  v2: use goto-label patch style suggested by Viresh.
>  v1: use plain of_node_put in each fail path.
> 
>  arch/arm/mach-spear/time.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-spear/time.c b/arch/arm/mach-spear/time.c
> index d1fdb6066f7b..c7c17c0f936c 100644
> --- a/arch/arm/mach-spear/time.c
> +++ b/arch/arm/mach-spear/time.c
> @@ -218,13 +218,13 @@ void __init spear_setup_of_timer(void)
>  	irq = irq_of_parse_and_map(np, 0);
>  	if (!irq) {
>  		pr_err("%s: No irq passed for timer via DT\n", __func__);
> -		return;
> +		goto err_put_np;
>  	}
>  
>  	gpt_base = of_iomap(np, 0);
>  	if (!gpt_base) {
>  		pr_err("%s: of iomap failed\n", __func__);
> -		return;
> +		goto err_put_np;
>  	}
>  
>  	gpt_clk = clk_get_sys("gpt0", NULL);
> @@ -239,6 +239,8 @@ void __init spear_setup_of_timer(void)
>  		goto err_prepare_enable_clk;
>  	}
>  
> +	of_node_put(np);
> +
>  	spear_clockevent_init(irq);
>  	spear_clocksource_init();
>  
> @@ -248,4 +250,6 @@ void __init spear_setup_of_timer(void)
>  	clk_put(gpt_clk);
>  err_iomap:
>  	iounmap(gpt_base);
> +err_put_np:
> +	of_node_put(np);
>  }

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh