linux-kernel - Re: [PATCH] [v2] media: imx: imx7-mipi-csis: Fix runtime PM imbalance in mipi_csis_s

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Message-ID: <20210409085317.ycj273fqwbmowfqb@arch-thunder.localdomain>
Date:   Fri, 9 Apr 2021 09:53:17 +0100
From:   Rui Miguel Silva <rmfrfs@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Steve Longerbeam <slongerbeam@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] media: imx: imx7-mipi-csis: Fix runtime PM
 imbalance in mipi_csis_s_stream

Hi Liu,
Many thanks for the patch.

On Fri, Apr 09, 2021 at 04:22:25PM +0800, Dinghao Liu wrote:
> When v4l2_subdev_call() fails, a pairing PM usage counter
> decrement is needed to keep the counter balanced. It's the
> same for the following error paths in case 'enable' is on.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>

LGTM
Reviewed-by: Rui Miguel Silva <rmfrfs@...il.com>

------
Cheers,
     Rui
> ---
> 
> Changelog:
> 
> v2: - Use pm_runtime_put() to balance the refcount.
> ---
>  drivers/staging/media/imx/imx7-mipi-csis.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/media/imx/imx7-mipi-csis.c b/drivers/staging/media/imx/imx7-mipi-csis.c
> index a01a7364b4b9..6f3e8a15e7c4 100644
> --- a/drivers/staging/media/imx/imx7-mipi-csis.c
> +++ b/drivers/staging/media/imx/imx7-mipi-csis.c
> @@ -628,7 +628,7 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
>  		}
>  		ret = v4l2_subdev_call(state->src_sd, core, s_power, 1);
>  		if (ret < 0)
> -			return ret;
> +			goto pm_put;
>  	}
>  
>  	mutex_lock(&state->lock);
> @@ -657,7 +657,8 @@ static int mipi_csis_s_stream(struct v4l2_subdev *mipi_sd, int enable)
>  
>  unlock:
>  	mutex_unlock(&state->lock);
> -	if (!enable)
> +pm_put:
> +	if (!enable || (ret < 0))
>  		pm_runtime_put(&state->pdev->dev);
>  
>  	return ret;
> -- 
> 2.17.1
> 
>