linux-kernel - Re: [PATCH] ASoC: rockchip: i2s_tdm: fix runtime pm imbalance on error

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Date:   Wed, 02 Mar 2022 11:04:06 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Zhen Ni <nizhen@...ontech.com>
Cc:     frattaroli.nicolas@...il.com, lgirdwood@...il.com,
        broonie@...nel.org, tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: rockchip: i2s_tdm: fix runtime pm imbalance on error

On Wed, 02 Mar 2022 11:00:19 +0100,
Zhen Ni wrote:
> 
> pm_runtime_get_sync() increments the runtime PM usage counter even the
> call returns an error code. Thus a pairing decrement is needed on the
> error handling path to keep the counter balanced.
> 
> Signed-off-by: Zhen Ni <nizhen@...ontech.com>

Better to use a new function pm_runtime_resume_and_get().


thanks,

Takashi

> ---
>  sound/soc/rockchip/rockchip_i2s_tdm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/rockchip/rockchip_i2s_tdm.c b/sound/soc/rockchip/rockchip_i2s_tdm.c
> index 5f9cb5c4c7f0..4691a76b499d 100644
> --- a/sound/soc/rockchip/rockchip_i2s_tdm.c
> +++ b/sound/soc/rockchip/rockchip_i2s_tdm.c
> @@ -1739,8 +1739,10 @@ static int __maybe_unused rockchip_i2s_tdm_resume(struct device *dev)
>  	int ret;
>  
>  	ret = pm_runtime_get_sync(dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put(dev);
>  		return ret;
> +	}
>  	ret = regcache_sync(i2s_tdm->regmap);
>  	pm_runtime_put(dev);
>  
> -- 
> 2.20.1
> 
> 
>