linux-kernel - Re: [PATCH v5 29/30] media: i2c: video-i2c: use pm_runtime_resume_and

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Date:   Fri, 7 May 2021 14:26:05 -0700
From:   Matt Ranostay <matt.ranostay@...sulko.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-media <linux-media@...r.kernel.org>
Subject: Re: [PATCH v5 29/30] media: i2c: video-i2c: use pm_runtime_resume_and_get()

On Thu, May 6, 2021 at 8:23 AM Mauro Carvalho Chehab
<mchehab+huawei@...nel.org> wrote:
>
> Commit dd8088d5a896 ("PM: runtime: Add pm_runtime_resume_and_get to deal with usage counter")
> added pm_runtime_resume_and_get() in order to automatically handle
> dev->power.usage_count decrement on errors.
>
> Use the new API, in order to cleanup the error check logic.
>

Acked-by: Matt Ranostay <matt.ranostay@...sulko.com>

> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  drivers/media/i2c/video-i2c.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/media/i2c/video-i2c.c b/drivers/media/i2c/video-i2c.c
> index 0465832a4090..de12f38f347c 100644
> --- a/drivers/media/i2c/video-i2c.c
> +++ b/drivers/media/i2c/video-i2c.c
> @@ -286,11 +286,9 @@ static int amg88xx_read(struct device *dev, enum hwmon_sensor_types type,
>         __le16 buf;
>         int tmp;
>
> -       tmp = pm_runtime_get_sync(regmap_get_device(data->regmap));
> -       if (tmp < 0) {
> -               pm_runtime_put_noidle(regmap_get_device(data->regmap));
> +       tmp = pm_runtime_resume_and_get(regmap_get_device(data->regmap));
> +       if (tmp < 0)
>                 return tmp;
> -       }
>
>         tmp = regmap_bulk_read(data->regmap, AMG88XX_REG_TTHL, &buf, 2);
>         pm_runtime_mark_last_busy(regmap_get_device(data->regmap));
> @@ -512,11 +510,9 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
>         if (data->kthread_vid_cap)
>                 return 0;
>
> -       ret = pm_runtime_get_sync(dev);
> -       if (ret < 0) {
> -               pm_runtime_put_noidle(dev);
> +       ret = pm_runtime_resume_and_get(dev);
> +       if (ret < 0)
>                 goto error_del_list;
> -       }
>
>         ret = data->chip->setup(data);
>         if (ret)
> --
> 2.30.2
>