linux-kernel - Re: [PATCH] media: bdisp: Fix runtime PM imbalance on error

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Date:   Mon, 8 Jun 2020 15:33:24 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     Fabien Dessenne <fabien.dessenne@...com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: bdisp: Fix runtime PM imbalance on error

On 21/05/2020 12:00, Dinghao Liu wrote:
> pm_runtime_get_sync() increments the runtime PM usage counter even
> when it returns an error code. Thus a pairing decrement is needed on
> the error handling path to keep the counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/media/platform/sti/bdisp/bdisp-v4l2.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c
> index af2d5eb782ce..e1d150584bdc 100644
> --- a/drivers/media/platform/sti/bdisp/bdisp-v4l2.c
> +++ b/drivers/media/platform/sti/bdisp/bdisp-v4l2.c
> @@ -1371,7 +1371,7 @@ static int bdisp_probe(struct platform_device *pdev)
>  	ret = pm_runtime_get_sync(dev);
>  	if (ret < 0) {
>  		dev_err(dev, "failed to set PM\n");
> -		goto err_dbg;
> +		goto err_pm;
>  	}
>  
>  	/* Filters */
> @@ -1399,7 +1399,6 @@ static int bdisp_probe(struct platform_device *pdev)
>  	bdisp_hw_free_filters(bdisp->dev);
>  err_pm:
>  	pm_runtime_put(dev);

pm_runtime_put_sync()?

> -err_dbg:
>  	bdisp_debugfs_remove(bdisp);
>  err_v4l2:
>  	v4l2_device_unregister(&bdisp->v4l2_dev);
> 

Regards,

	Hans