linux-kernel - Re: [PATCH v4] cpuidle: big.LITTLE: fix refcount leak

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Message-ID: <ee49b2fc-f855-4406-8780-0638d5fe09a0@linaro.org>
Date:   Mon, 10 Dec 2018 18:00:12 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yangtao Li <tiny.windzz@...il.com>, lorenzo.pieralisi@....com,
        rjw@...ysocki.net
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] cpuidle: big.LITTLE: fix refcount leak

On 10/12/2018 17:26, Yangtao Li wrote:
> of_find_node_by_path() acquires a reference to the node
> returned by it and that reference needs to be dropped by its caller.
> bl_idle_init() doesn't do that, so fix it.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

> ---
> changes in v4:
> -update tile
> -refactor code,suggested by Daniel
> ---
>  drivers/cpuidle/cpuidle-big_little.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
> index db2ede565f1a..b44476a1b7ad 100644
> --- a/drivers/cpuidle/cpuidle-big_little.c
> +++ b/drivers/cpuidle/cpuidle-big_little.c
> @@ -167,6 +167,7 @@ static int __init bl_idle_init(void)
>  {
>  	int ret;
>  	struct device_node *root = of_find_node_by_path("/");
> +	const struct of_device_id *match_id;
>  
>  	if (!root)
>  		return -ENODEV;
> @@ -174,7 +175,11 @@ static int __init bl_idle_init(void)
>  	/*
>  	 * Initialize the driver just for a compliant set of machines
>  	 */
> -	if (!of_match_node(compatible_machine_match, root))
> +	match_id = of_match_node(compatible_machine_match, root);
> +
> +	of_node_put(root);
> +
> +	if (!match_id)
>  		return -ENODEV;
>  
>  	if (!mcpm_is_available())
> 


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