linux-kernel - Re: [PATCH] media: staging: tegra-vde: fix runtime pm imbalance on error

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Message-ID: <2b5d64f5-825f-c081-5d03-02655c2d9491@gmail.com>
Date:   Wed, 20 May 2020 13:15:44 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        linux-media@...r.kernel.org, linux-tegra@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: staging: tegra-vde: fix runtime pm imbalance on
 error

20.05.2020 12:51, Dinghao Liu пишет:
> pm_runtime_get_sync() increments the runtime PM usage counter even
> 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/staging/media/tegra-vde/vde.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/media/tegra-vde/vde.c b/drivers/staging/media/tegra-vde/vde.c
> index d3e63512a765..dd134a3a15c7 100644
> --- a/drivers/staging/media/tegra-vde/vde.c
> +++ b/drivers/staging/media/tegra-vde/vde.c
> @@ -777,7 +777,7 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
>  
>  	ret = pm_runtime_get_sync(dev);
>  	if (ret < 0)
> -		goto unlock;
> +		goto put_runtime_pm;
>  
>  	/*
>  	 * We rely on the VDE registers reset value, otherwise VDE
> 

Hello Dinghao,

Thank you for the patch. I sent out a similar patch a week ago [1].

[1]
https://patchwork.ozlabs.org/project/linux-tegra/patch/20200514210847.9269-2-digetx@gmail.com/

The pm_runtime_put_noidle() should have the same effect as yours
variant, although my variant won't change the last_busy RPM time, which
I think is a bit more appropriate behavior.