linux-kernel - Re: [PATCH] ASoC: tegra: Fix reference count leaks.

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Date:   Tue, 16 Jun 2020 20:42:50 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     <wu000273@....edu>, <kjlu@....edu>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Thierry Reding" <thierry.reding@...il.com>,
        YueHaibing <yuehaibing@...wei.com>,
        "Ben Dooks" <ben.dooks@...ethink.co.uk>,
        Edward Cragg <edward.cragg@...ethink.co.uk>,
        <alsa-devel@...a-project.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: tegra: Fix reference count leaks.


On 13/06/2020 21:44, wu000273@....edu wrote:
> From: Qiushi Wu <wu000273@....edu>
> 
> Calling pm_runtime_get_sync increments the counter even in case of
> failure, causing incorrect ref count if pm_runtime_put is not called in
> error handling paths. Call pm_runtime_put if pm_runtime_get_sync fails.
> 
> Signed-off-by: Qiushi Wu <wu000273@....edu>
> ---
>  sound/soc/tegra/tegra30_ahub.c | 4 +++-
>  sound/soc/tegra/tegra30_i2s.c  | 4 +++-
>  2 files changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/soc/tegra/tegra30_ahub.c b/sound/soc/tegra/tegra30_ahub.c
> index 635eacbd28d4..156e3b9d613c 100644
> --- a/sound/soc/tegra/tegra30_ahub.c
> +++ b/sound/soc/tegra/tegra30_ahub.c
> @@ -643,8 +643,10 @@ static int tegra30_ahub_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(ahub->regmap_ahub);
>  	ret |= regcache_sync(ahub->regmap_apbif);
>  	pm_runtime_put(dev);
> diff --git a/sound/soc/tegra/tegra30_i2s.c b/sound/soc/tegra/tegra30_i2s.c
> index d59882ec48f1..db5a8587bfa4 100644
> --- a/sound/soc/tegra/tegra30_i2s.c
> +++ b/sound/soc/tegra/tegra30_i2s.c
> @@ -567,8 +567,10 @@ static int tegra30_i2s_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->regmap);
>  	pm_runtime_put(dev);

Thanks.

Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Cheers
Jon

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