linux-kernel - Re: [PATCH] ASoC: rockchip: Fix a reference count leak.

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Message-ID: <3050852.oyibrqGndV@diego>
Date:   Thu, 18 Jun 2020 14:32:15 +0200
From:   Heiko Stübner <heiko@...ech.de>
To:     wu000273@....edu
Cc:     kjlu@....edu, Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Sugar Zhang <sugar.zhang@...k-chips.com>,
        alsa-devel@...a-project.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: rockchip: Fix a reference count leak.

Am Samstag, 13. Juni 2020, 22:51:58 CEST schrieb wu000273@....edu:
> 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.
> 
> Fixes: fc05a5b22253 ("ASoC: rockchip: add support for pdm controller")
> Signed-off-by: Qiushi Wu <wu000273@....edu>

somewhat unintuitive, but I checked __pm_runtime_resume for it, so
Reviewed-by: Heiko Stuebner <heiko@...ech.de>

> ---
>  sound/soc/rockchip/rockchip_pdm.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
> index 7cd42fcfcf38..1707414cfa92 100644
> --- a/sound/soc/rockchip/rockchip_pdm.c
> +++ b/sound/soc/rockchip/rockchip_pdm.c
> @@ -590,8 +590,10 @@ static int rockchip_pdm_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(pdm->regmap);
>  
>