linux-kernel - [PATCH 1/3] drm/rockchip: cdn-dp: fix reference leak when pm_runtime_get

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Message-ID: <20201201125459.142178-2-miaoqinglang@huawei.com>
Date:   Tue, 1 Dec 2020 20:54:57 +0800
From:   Qinglang Miao <miaoqinglang@...wei.com>
To:     Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Qinglang Miao <miaoqinglang@...wei.com>
Subject: [PATCH 1/3] drm/rockchip: cdn-dp: fix reference leak when pm_runtime_get_sync fails

The PM reference count is not expected to be incremented on
return in cdn_dp_clk_enable.

However, pm_runtime_get_sync will increment the PM reference
count 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: efe0220fc2d2 ("drm/rockchip: cdn-dp: Fix error handling")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
---
 drivers/gpu/drm/rockchip/cdn-dp-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index a4a45daf9..9b4406191 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -98,7 +98,7 @@ static int cdn_dp_clk_enable(struct cdn_dp_device *dp)
 		goto err_core_clk;
 	}
 
-	ret = pm_runtime_get_sync(dp->dev);
+	ret = pm_runtime_resume_and_get(dp->dev);
 	if (ret < 0) {
 		DRM_DEV_ERROR(dp->dev, "cannot get pm runtime %d\n", ret);
 		goto err_pm_runtime_get;
-- 
2.23.0