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From:   Qinglang Miao <miaoqinglang@huawei.com>
To:     Sandy Huang <hjc@rock-chips.com>,
        =?UTF-8?q?Heiko=20St=C3=BCbner?= <heiko@sntech.de>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>
CC:     <dri-devel@lists.freedesktop.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-rockchip@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>,
        Qinglang Miao <miaoqinglang@huawei.com>
Subject: [PATCH 3/3] drm/rockchip: lvds: fix reference leak when pm_runtime_get_sync fails
Date:   Mon, 30 Nov 2020 21:44:27 +0800
Message-ID: <20201130134427.57545-4-miaoqinglang@huawei.com>
In-Reply-To: <20201130134427.57545-1-miaoqinglang@huawei.com>
References: <20201130134427.57545-1-miaoqinglang@huawei.com>
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pm_runtime_get_sync will increment pm usage counter even
failed. Forgetting to putting operation will result in a
reference leak here.

Replace it with pm_runtime_resume_and_get to keep usage
counter balanced.

Fixes: cca1705c3d89 ("drm/rockchip: lvds: Add PX30 support")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
 drivers/gpu/drm/rockchip/rockchip_lvds.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_lvds.c b/drivers/gpu/drm/rockchip/rockchip_lvds.c
index f292c6a6e..c3b1ac484 100644
--- a/drivers/gpu/drm/rockchip/rockchip_lvds.c
+++ b/drivers/gpu/drm/rockchip/rockchip_lvds.c
@@ -145,7 +145,7 @@ static int rk3288_lvds_poweron(struct rockchip_lvds *lvds)
 		DRM_DEV_ERROR(lvds->dev, "failed to enable lvds pclk %d\n", ret);
 		return ret;
 	}
-	ret = pm_runtime_get_sync(lvds->dev);
+	ret = pm_runtime_resume_and_get(lvds->dev);
 	if (ret < 0) {
 		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
 		clk_disable(lvds->pclk);
@@ -329,7 +329,7 @@ static int px30_lvds_poweron(struct rockchip_lvds *lvds)
 {
 	int ret;
 
-	ret = pm_runtime_get_sync(lvds->dev);
+	ret = pm_runtime_resume_and_get(lvds->dev);
 	if (ret < 0) {
 		DRM_DEV_ERROR(lvds->dev, "failed to get pm runtime: %d\n", ret);
 		return ret;
-- 
2.23.0