[PATCH] ASoC: rockchip: Fix a reference count leak.

[Heiko Stübner]

Am Samstag, 13. Juni 2020, 22:51:58 CEST schrieb wu000273 at umn.edu:
> From: Qiushi Wu <wu000273 at umn.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 at umn.edu>

somewhat unintuitive, but I checked __pm_runtime_resume for it, so
Reviewed-by: Heiko Stuebner <heiko at sntech.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);
>  
>