linux-kernel - [PATCH 5.10 150/663] drm: rcar-du: Fix PM reference leak in rcar_cmm

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Date:   Mon,  1 Mar 2021 17:06:38 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hulk Robot <hulkci@...wei.com>,
        Qinglang Miao <miaoqinglang@...wei.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 150/663] drm: rcar-du: Fix PM reference leak in rcar_cmm_enable()

From: Qinglang Miao <miaoqinglang@...wei.com>

[ Upstream commit 136ce7684bc1ff4a088812f600c63daca50b32c2 ]

pm_runtime_get_sync will increment pm usage counter even it failed.
Forgetting to putting operation will result in a reference leak here.

A new function pm_runtime_resume_and_get is introduced in [0] to keep
usage counter balanced. So We fix the reference leak by replacing it
with new funtion.

[0] dd8088d5a896 ("PM: runtime: Add  pm_runtime_resume_and_get to deal with usage counter")

Fixes: e08e934d6c28 ("drm: rcar-du: Add support for CMM")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
Acked-by: Jacopo Mondi <jacopo@...ndi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/rcar-du/rcar_cmm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rcar-du/rcar_cmm.c b/drivers/gpu/drm/rcar-du/rcar_cmm.c
index c578095b09a53..382d53f8a22e8 100644
--- a/drivers/gpu/drm/rcar-du/rcar_cmm.c
+++ b/drivers/gpu/drm/rcar-du/rcar_cmm.c
@@ -122,7 +122,7 @@ int rcar_cmm_enable(struct platform_device *pdev)
 {
 	int ret;
 
-	ret = pm_runtime_get_sync(&pdev->dev);
+	ret = pm_runtime_resume_and_get(&pdev->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.27.0