linux-kernel - Re: [PATCH v4 63/79] media: exynos-gsc: use pm_runtime_resume_and

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Message-ID: <20210430185001.00005e76@Huawei.com>
Date:   Fri, 30 Apr 2021 18:50:01 +0100
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
CC:     <linuxarm@...wei.com>, <mauro.chehab@...wei.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        "Krzysztof Kozlowski" <krzk@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-media@...r.kernel.org>,
        <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v4 63/79] media: exynos-gsc: use
 pm_runtime_resume_and_get()

On Wed, 28 Apr 2021 16:52:24 +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.
> 
> Reviewed-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
>  drivers/media/platform/exynos-gsc/gsc-m2m.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/exynos-gsc/gsc-m2m.c b/drivers/media/platform/exynos-gsc/gsc-m2m.c
> index 27a3c92c73bc..09551e96ac15 100644
> --- a/drivers/media/platform/exynos-gsc/gsc-m2m.c
> +++ b/drivers/media/platform/exynos-gsc/gsc-m2m.c
> @@ -58,7 +58,7 @@ static int gsc_m2m_start_streaming(struct vb2_queue *q, unsigned int count)
>  	struct gsc_ctx *ctx = q->drv_priv;
>  	int ret;
>  
> -	ret = pm_runtime_get_sync(&ctx->gsc_dev->pdev->dev);
> +	ret = pm_runtime_resume_and_get(&ctx->gsc_dev->pdev->dev);
>  	return ret > 0 ? 0 : ret;
return pm_runtime_resume_and_get()

as
static inline int pm_runtime_resume_and_get(struct device *dev)
{
	int ret;

	ret = __pm_runtime_resume(dev, RPM_GET_PUT);
	if (ret < 0) {
		pm_runtime_put_noidle(dev);
		return ret;
	}

	return 0;
}

Can't return >= 0

>  }
>