linux-kernel - [PATCH V2] drm: bridge: cdns-mhdp8546: Fix PM reference leak in cdns_mhdp

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Message-ID: <20210529095554.3150362-1-yukuai3@huawei.com>
Date:   Sat, 29 May 2021 17:55:54 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <a.hajda@...sung.com>, <narmstrong@...libre.com>,
        <robert.foss@...aro.org>, <airlied@...ux.ie>, <daniel@...ll.ch>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <yukuai3@...wei.com>, <yi.zhang@...wei.com>
Subject: [PATCH V2] drm: bridge: cdns-mhdp8546: Fix PM reference leak in cdns_mhdp_probe()

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@...wei.com>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
changes in V2:
 - change error message.

 drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
index 0cd8f40fb690..eab959a59214 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c
@@ -2478,9 +2478,9 @@ static int cdns_mhdp_probe(struct platform_device *pdev)
 	clk_prepare_enable(clk);
 
 	pm_runtime_enable(dev);
-	ret = pm_runtime_get_sync(dev);
+	ret = pm_runtime_resume_and_get(dev);
 	if (ret < 0) {
-		dev_err(dev, "pm_runtime_get_sync failed\n");
+		dev_err(dev, "pm_runtime_resume_and_get failed\n");
 		pm_runtime_disable(dev);
 		goto clk_disable;
 	}
-- 
2.25.4