linux-kernel - [PATCH 2/2] drm/v3d: Fix PM reference leak in v3d_v3d_debugfs

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Date:   Mon, 17 May 2021 16:14:38 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <emma@...olt.net>, <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 2/2] drm/v3d: Fix PM reference leak in v3d_v3d_debugfs_ident()

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>
---
 drivers/gpu/drm/v3d/v3d_debugfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c
index e76b24bb8828..91ceed774140 100644
--- a/drivers/gpu/drm/v3d/v3d_debugfs.c
+++ b/drivers/gpu/drm/v3d/v3d_debugfs.c
@@ -132,7 +132,7 @@ static int v3d_v3d_debugfs_ident(struct seq_file *m, void *unused)
 	u32 ident0, ident1, ident2, ident3, cores;
 	int ret, core;
 
-	ret = pm_runtime_get_sync(v3d->drm.dev);
+	ret = pm_runtime_resume_and_get(v3d->drm.dev);
 	if (ret < 0)
 		return ret;
 
@@ -219,7 +219,7 @@ static int v3d_measure_clock(struct seq_file *m, void *unused)
 	int measure_ms = 1000;
 	int ret;
 
-	ret = pm_runtime_get_sync(v3d->drm.dev);
+	ret = pm_runtime_resume_and_get(v3d->drm.dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.25.4