linux-kernel - [PATCH -next] drm/panfrost: Fix PM reference leak in panfrost_job_hw

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Date:   Tue, 11 May 2021 14:29:11 +0800
From:   Zou Wei <zou_wei@...wei.com>
To:     <robh@...nel.org>, <tomeu.vizoso@...labora.com>,
        <airlied@...ux.ie>, <daniel@...ll.ch>, <steven.price@....com>,
        <alyssa.rosenzweig@...labora.com>
CC:     <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Zou Wei <zou_wei@...wei.com>
Subject: [PATCH -next] drm/panfrost: Fix PM reference leak in panfrost_job_hw_submit()

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: Zou Wei <zou_wei@...wei.com>
---
 drivers/gpu/drm/panfrost/panfrost_job.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index 6003cfe..42d8dbc 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -157,7 +157,7 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
 
 	panfrost_devfreq_record_busy(&pfdev->pfdevfreq);
 
-	ret = pm_runtime_get_sync(pfdev->dev);
+	ret = pm_runtime_resume_and_get(pfdev->dev);
 	if (ret < 0)
 		return;
 
-- 
2.6.2