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

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Message-Id: <20200614062339.87374-1-navid.emamdoost@gmail.com>
Date:   Sun, 14 Jun 2020 01:23:39 -0500
From:   Navid Emamdoost <navid.emamdoost@...il.com>
To:     Inki Dae <inki.dae@...sung.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, smccaman@....edu,
        Navid Emamdoost <navid.emamdoost@...il.com>
Subject: [PATCH] drm/exynos: fix ref count leak in mic_pre_enable

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>
---
 drivers/gpu/drm/exynos/exynos_drm_mic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index a86abc173605..69ff74c2ceb5 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -270,7 +270,7 @@ static void mic_pre_enable(struct drm_bridge *bridge)
 
 	ret = pm_runtime_get_sync(mic->dev);
 	if (ret < 0)
-		goto unlock;
+		goto turn_off;
 
 	mic_set_path(mic, 1);
 
-- 
2.17.1