linux-kernel - [PATCH] drm/amdgpu: fix PM reference leak in amdgpu_debugfs_gfxoff

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Message-ID: <20210517081632.1563569-1-yukuai3@huawei.com>
Date:   Mon, 17 May 2021 16:16:32 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <alexander.deucher@....com>, <christian.koenig@....com>,
        <Xinhui.Pan@....com>, <airlied@...ux.ie>, <daniel@...ll.ch>
CC:     <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH] drm/amdgpu: fix PM reference leak in amdgpu_debugfs_gfxoff_rea()

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/amd/amdgpu/amdgpu_debugfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
index bcaf271b39bf..eb7f9d20dad7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c
@@ -1058,7 +1058,7 @@ static ssize_t amdgpu_debugfs_gfxoff_read(struct file *f, char __user *buf,
 	if (size & 0x3 || *pos & 0x3)
 		return -EINVAL;
 
-	r = pm_runtime_get_sync(adev_to_drm(adev)->dev);
+	r = pm_runtime_resume_and_get(adev_to_drm(adev)->dev);
 	if (r < 0)
 		return r;
 
-- 
2.25.4