linux-kernel - Re: [PATCH v2] drm/exynos: fix ref count leak in mic_pre

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Message-ID: <ece0b0bb-43d6-0e8e-3fcd-280dac6cd07f@samsung.com>
Date:   Tue, 16 Jun 2020 10:13:23 +0900
From:   Inki Dae <inki.dae@...sung.com>
To:     Navid Emamdoost <navid.emamdoost@...il.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     emamd001@....edu, wu000273@....edu, kjlu@....edu,
        mccamant@...umn.edu
Subject: Re: [PATCH v2] drm/exynos: fix ref count leak in mic_pre_enable



20. 6. 15. 오후 2:49에 Navid Emamdoost 이(가) 쓴 글:
> in mic_pre_enable, pm_runtime_get_sync is called which
> increments the counter even in case of failure, leading to incorrect
> ref count. In case of failure, decrement the ref count before returning.
> 
> Signed-off-by: Navid Emamdoost <navid.emamdoost@...il.com>
> ---
> Changes in v2:
> 	- reuse the unlock label and call pm_runtime_put_noidle

Picked it up.

Thanks,
Inki Dae

> ---
> ---
>  drivers/gpu/drm/exynos/exynos_drm_mic.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> index a86abc173605..3821ea76a703 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
> @@ -269,8 +269,10 @@ static void mic_pre_enable(struct drm_bridge *bridge)
>  		goto unlock;
>  
>  	ret = pm_runtime_get_sync(mic->dev);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(mic->dev);
>  		goto unlock;
> +	}
>  
>  	mic_set_path(mic, 1);
>  
>