linux-kernel - Re: [PATCH] power: supply: bq24190_charger: fix runtime pm imbalance

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Date:   Mon, 25 May 2020 12:33:49 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     Kangjie Lu <kjlu@....edu>, Sebastian Reichel <sre@...nel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] power: supply: bq24190_charger: fix runtime pm imbalance

On Wed, May 20, 2020 at 10:01 AM Dinghao Liu <dinghao.liu@....edu.cn> wrote:
>
> pm_runtime_get_sync() increments the runtime PM usage counter even
> it returns an error code. Thus a pairing decrement is needed on
> the error handling path to keep the counter balanced.
>
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/power/supply/bq24190_charger.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/power/supply/bq24190_charger.c b/drivers/power/supply/bq24190_charger.c
> index 453d6332d43a..4f7c6b6abb56 100644
> --- a/drivers/power/supply/bq24190_charger.c
> +++ b/drivers/power/supply/bq24190_charger.c
> @@ -481,8 +481,10 @@ static ssize_t bq24190_sysfs_store(struct device *dev,
>                 return ret;
>
>         ret = pm_runtime_get_sync(bdi->dev);
> -       if (ret < 0)
> +       if (ret < 0) {
> +               pm_runtime_put_autosuspend(bdi->dev);

The autosuspend thing is not necessary here, because the suspend is
not going to work anyway due to the resume error, so this can be
_put_noidle().

You might as well do something like

count = ret;
goto out;

here and add an "out" label before the pm_runtime_mark_last_busy() call, though.

>                 return ret;
> +       }
>
>         ret = bq24190_write_mask(bdi, info->reg, info->mask, info->shift, v);
>         if (ret)
> --
> 2.17.1
>