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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Wang Li <wangli74@huawei.com>, Hulk Robot <hulkci@huawei.com>,
        Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        Sasha Levin <sashal@kernel.org>,
        dri-devel@lists.freedesktop.org,
        linux-mediatek@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 5.13 025/189] drm/mediatek: Fix PM reference leak in mtk_crtc_ddp_hw_init()
Date:   Tue,  6 Jul 2021 07:11:25 -0400
Message-Id: <20210706111409.2058071-25-sashal@kernel.org>
In-Reply-To: <20210706111409.2058071-1-sashal@kernel.org>
References: <20210706111409.2058071-1-sashal@kernel.org>
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From: Wang Li <wangli74@huawei.com>

[ Upstream commit 69777e6ca396f0a7e1baff40fcad4a9d3d445b7a ]

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.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Li <wangli74@huawei.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
index 40df2c823187..474efb844249 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
@@ -260,7 +260,7 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
 		drm_connector_list_iter_end(&conn_iter);
 	}
 
-	ret = pm_runtime_get_sync(crtc->dev->dev);
+	ret = pm_runtime_resume_and_get(crtc->dev->dev);
 	if (ret < 0) {
 		DRM_ERROR("Failed to enable power domain: %d\n", ret);
 		return ret;
-- 
2.30.2