linux-kernel - Re: [PATCH v5 16/25] media: rcar-fcp: use pm_runtime_resume_and

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Date:   Thu, 6 May 2021 19:05:21 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v5 16/25] media: rcar-fcp: use pm_runtime_resume_and_get()

Hi Mauro,

Thank you for the patch.

On Thu, May 06, 2021 at 05:25:54PM +0200, Mauro Carvalho Chehab 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.
> 
> As a bonus, pm_runtime_resume_and_get() always return 0 on success.
> So, the code can be simplified.
> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
>  drivers/media/platform/rcar-fcp.c | 8 +-------
>  1 file changed, 1 insertion(+), 7 deletions(-)
> 
> diff --git a/drivers/media/platform/rcar-fcp.c b/drivers/media/platform/rcar-fcp.c
> index 5c03318ae07b..a3a7afc03d7b 100644
> --- a/drivers/media/platform/rcar-fcp.c
> +++ b/drivers/media/platform/rcar-fcp.c
> @@ -101,13 +101,7 @@ int rcar_fcp_enable(struct rcar_fcp_device *fcp)
>  	if (!fcp)
>  		return 0;
>  
> -	ret = pm_runtime_get_sync(fcp->dev);
> -	if (ret < 0) {
> -		pm_runtime_put_noidle(fcp->dev);
> -		return ret;
> -	}
> -
> -	return 0;
> +	return pm_runtime_resume_and_get(fcp->dev);
>  }
>  EXPORT_SYMBOL_GPL(rcar_fcp_enable);
>  

-- 
Regards,

Laurent Pinchart