linux-kernel - Re: [PATCH V2] thermal: imx: Add missing of_node

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Message-ID: <CAHLCerP7O19cRsK6OfmGm89K7KefRQnCUdNCNQM8mEAbycUjbg@mail.gmail.com>
Date:   Wed, 29 Apr 2020 01:58:56 +0530
From:   Amit Kucheria <amit.kucheria@...durent.com>
To:     Anson Huang <Anson.Huang@....com>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>, kernel@...gutronix.de,
        Fabio Estevam <festevam@...il.com>,
        Linux PM list <linux-pm@...r.kernel.org>,
        lakml <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        dl-linux-imx <Linux-imx@....com>
Subject: Re: [PATCH V2] thermal: imx: Add missing of_node_put()

On Thu, Mar 26, 2020 at 8:06 PM Anson Huang <Anson.Huang@....com> wrote:
>
> After finishing using cpu node got from of_get_cpu_node(), of_node_put()
> needs to be called.
>
> Signed-off-by: Anson Huang <Anson.Huang@....com>
> ---
> Changes since V1:
>         - improve the logic, no need to use got.
> ---
>  drivers/thermal/imx_thermal.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
> index e761c9b..1b84ea6 100644
> --- a/drivers/thermal/imx_thermal.c
> +++ b/drivers/thermal/imx_thermal.c
> @@ -649,7 +649,7 @@ MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
>  static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
>  {
>         struct device_node *np;
> -       int ret;
> +       int ret = 0;
>
>         data->policy = cpufreq_cpu_get(0);
>         if (!data->policy) {
> @@ -664,11 +664,12 @@ static int imx_thermal_register_legacy_cooling(struct imx_thermal_data *data)
>                 if (IS_ERR(data->cdev)) {
>                         ret = PTR_ERR(data->cdev);
>                         cpufreq_cpu_put(data->policy);

You could move this policy release outside the if block too, no?

> -                       return ret;
>                 }
>         }
>
> -       return 0;
> +       of_node_put(np);
> +
> +       return ret;
>  }
>
>  static void imx_thermal_unregister_legacy_cooling(struct imx_thermal_data *data)
> --
> 2.7.4
>