[PATCH 2/3] media: platform: mtk-mdp3: fix PM reference leak in mdp_comp_clock_on()

[Sun Ke]

mdp_comp_clock_on will increase runtime PM usage counter,
and mdp_comp_clock_off will decrease the runtime PM usage counter.
so, if mdp_comp_clock_on failed after increment runtime PM usage
counter, it should decrease it before return a error code.

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in reference leak here.
Fix it by replacing it with pm_runtime_resume_and_get to keep usage
counter balanced.

And if failed to enable clk, add pm_runtime_put() to decrease the
runtime PM usage counter.

Fixes: 61890ccaefaf ("media: platform: mtk-mdp3: add MediaTek MDP3 driver")
Signed-off-by: Sun Ke <sunke32 at huawei.com>
---
 drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
index 9a6ba5851ccb..d3eaf8884412 100644
--- a/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
+++ b/drivers/media/platform/mediatek/mdp3/mtk-mdp3-comp.c
@@ -682,7 +682,7 @@ int mdp_comp_clock_on(struct device *dev, struct mdp_comp *comp)
 	int i, ret;
 
 	if (comp->comp_dev) {
-		ret = pm_runtime_get_sync(comp->comp_dev);
+		ret = pm_runtime_resume_and_get(comp->comp_dev);
 		if (ret < 0) {
 			dev_err(dev,
 				"Failed to get power, err %d. type:%d id:%d\n",
@@ -699,6 +699,7 @@ int mdp_comp_clock_on(struct device *dev, struct mdp_comp *comp)
 			dev_err(dev,
 				"Failed to enable clk %d. type:%d id:%d\n",
 				i, comp->type, comp->id);
+			pm_runtime_put(comp->comp_dev);
 			return ret;
 		}
 	}
-- 
2.31.1