linux-kernel - Re: [PATCH v4 26/79] staging: media: tegra-video: use pm_runtime_resume_and

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Date:   Fri, 30 Apr 2021 18:13:00 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
CC:     <linuxarm@...wei.com>, <mauro.chehab@...wei.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        "Mauro Carvalho Chehab" <mchehab@...nel.org>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        <devel@...verdev.osuosl.org>, <linux-kernel@...r.kernel.org>,
        <linux-media@...r.kernel.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v4 26/79] staging: media: tegra-video: use
 pm_runtime_resume_and_get()

On Wed, 28 Apr 2021 16:51:47 +0200
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.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
NOP patch so 
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---
>  drivers/staging/media/tegra-video/csi.c | 3 +--
>  drivers/staging/media/tegra-video/vi.c  | 3 +--
>  2 files changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/media/tegra-video/csi.c b/drivers/staging/media/tegra-video/csi.c
> index 033a6935c26d..e938bf4c48b6 100644
> --- a/drivers/staging/media/tegra-video/csi.c
> +++ b/drivers/staging/media/tegra-video/csi.c
> @@ -298,10 +298,9 @@ static int tegra_csi_enable_stream(struct v4l2_subdev *subdev)
>  	struct tegra_csi *csi = csi_chan->csi;
>  	int ret, err;
>  
> -	ret = pm_runtime_get_sync(csi->dev);
> +	ret = pm_runtime_resume_and_get(csi->dev);
>  	if (ret < 0) {
>  		dev_err(csi->dev, "failed to get runtime PM: %d\n", ret);
> -		pm_runtime_put_noidle(csi->dev);
>  		return ret;
>  	}
>  
> diff --git a/drivers/staging/media/tegra-video/vi.c b/drivers/staging/media/tegra-video/vi.c
> index 7a09061cda57..1298740a9c6c 100644
> --- a/drivers/staging/media/tegra-video/vi.c
> +++ b/drivers/staging/media/tegra-video/vi.c
> @@ -297,10 +297,9 @@ static int tegra_channel_start_streaming(struct vb2_queue *vq, u32 count)
>  	struct tegra_vi_channel *chan = vb2_get_drv_priv(vq);
>  	int ret;
>  
> -	ret = pm_runtime_get_sync(chan->vi->dev);
> +	ret = pm_runtime_resume_and_get(chan->vi->dev);
>  	if (ret < 0) {
>  		dev_err(chan->vi->dev, "failed to get runtime PM: %d\n", ret);
> -		pm_runtime_put_noidle(chan->vi->dev);
>  		return ret;
>  	}
>