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From:   Navid Emamdoost <navid.emamdoost@gmail.com>
To:     Inki Dae <inki.dae@samsung.com>,
        Joonyoung Shim <jy0922.shim@samsung.com>,
        Seung-Woo Kim <sw0312.kim@samsung.com>,
        Kyungmin Park <kyungmin.park@samsung.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>, Kukjin Kim <kgene@kernel.org>,
        Krzysztof Kozlowski <krzk@kernel.org>,
        dri-devel@lists.freedesktop.org,
        linux-arm-kernel@lists.infradead.org,
        linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     emamd001@umn.edu, wu000273@umn.edu, kjlu@umn.edu,
        mccamant@cs.umn.edu, Navid Emamdoost <navid.emamdoost@gmail.com>
Subject: [PATCH v2] drm/exynos: fix ref count leak in mic_pre_enable
Date:   Mon, 15 Jun 2020 00:49:28 -0500
Message-Id: <20200615054928.55188-1-navid.emamdoost@gmail.com>
In-Reply-To: <027d9eb5-a1c1-c329-72c3-a555b71f8677@samsung.com>
References: <027d9eb5-a1c1-c329-72c3-a555b71f8677@samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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@gmail.com>
---
Changes in v2:
	- reuse the unlock label and call pm_runtime_put_noidle
---
---
 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);
 
-- 
2.17.1