linux-kernel - Re: [PATCH] [v2] media: venus: core: Fix runtime PM imbalance in venus

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Date:   Thu, 25 Jun 2020 18:52:08 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] media: venus: core: Fix runtime PM imbalance in
 venus_probe

Hi Dinghao,

On 6/24/20 9:30 AM, 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. For other error
> paths after this call, things are the same.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
> 
> Changelog:
> 
> v2: - Add pm_runtime_get_noresume() on failure of
>       pm_runtime_put_sync() to balance PM counter instead of
>       releasing everything here.

You are adding pm_runtime_get_noresume in pm_runtime_put_sync error path
but the patch description is referring to pm_runtime_get_sync. I'm confused.

> ---
>  drivers/media/platform/qcom/venus/core.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 203c6538044f..b0b932bf8c02 100644
> --- a/drivers/media/platform/qcom/venus/core.c
> +++ b/drivers/media/platform/qcom/venus/core.c
> @@ -287,8 +287,10 @@ static int venus_probe(struct platform_device *pdev)
>  		goto err_core_deinit;
>  
>  	ret = pm_runtime_put_sync(dev);
> -	if (ret)
> +	if (ret) {
> +		pm_runtime_get_noresume(dev);
>  		goto err_dev_unregister;
> +	}
>  
>  	return 0;
>  
> @@ -299,6 +301,7 @@ static int venus_probe(struct platform_device *pdev)
>  err_venus_shutdown:
>  	venus_shutdown(core);
>  err_runtime_disable:
> +	pm_runtime_put_noidle(dev);
>  	pm_runtime_set_suspended(dev);
>  	pm_runtime_disable(dev);
>  	hfi_destroy(core);
> 

-- 
regards,
Stan