linux-kernel - Re: [PATCH v3] cpuidle: big.LITTLE: add of_node

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Message-ID: <CAEExFWtiqTgQmMLwvMhx8UvfU9o75jsZkAjBgyHhAOwuemJdNw@mail.gmail.com>
Date:   Sun, 9 Dec 2018 14:20:26 +0800
From:   Frank Lee <tiny.windzz@...il.com>
To:     rjw@...ysocki.net, Daniel Lezcano <daniel.lezcano@...aro.org>,
        lorenzo.pieralisi@....com
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] cpuidle: big.LITTLE: add of_node_put()

On Wed, Nov 21, 2018 at 12:14 AM Yangtao Li <tiny.windzz@...il.com> 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>
> ---
> Changes in v3:
> -update changelog
> ---
>  drivers/cpuidle/cpuidle-big_little.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
> index db2ede565f1a..650f063ef809 100644
> --- a/drivers/cpuidle/cpuidle-big_little.c
> +++ b/drivers/cpuidle/cpuidle-big_little.c
> @@ -174,8 +174,12 @@ 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))
> +       if (!of_match_node(compatible_machine_match, root)){
> +               of_node_put(root);
>                 return -ENODEV;
> +       }
> +
> +       of_node_put(root);
>
>         if (!mcpm_is_available())
>                 return -EUNATCH;
> --
> 2.17.0
>
ping......