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From: Qinglang Miao <miaoqinglang@huawei.com>
To: Qiang Yu <yuq825@gmail.com>, David Airlie <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>
Cc: <dri-devel@lists.freedesktop.org>, <lima@lists.freedesktop.org>,
	<linux-kernel@vger.kernel.org>,
	Qinglang Miao <miaoqinglang@huawei.com>
Subject: [PATCH] drm/lima: fix reference leak in lima_pm_busy
Date: Fri, 27 Nov 2020 17:44:38 +0800	[thread overview]
Message-ID: <20201127094438.121003-1-miaoqinglang@huawei.com> (raw)

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: 50de2e9ebbc0 ("drm/lima: enable runtime pm")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
 drivers/gpu/drm/lima/lima_sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
index dc6df9e9a..f6e7a88a5 100644
--- a/drivers/gpu/drm/lima/lima_sched.c
+++ b/drivers/gpu/drm/lima/lima_sched.c
@@ -200,7 +200,7 @@ static int lima_pm_busy(struct lima_device *ldev)
 	int ret;
 
 	/* resume GPU if it has been suspended by runtime PM */
-	ret = pm_runtime_get_sync(ldev->dev);
+	ret = pm_runtime_resume_and_get(ldev->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.23.0


WARNING: multiple messages have this Message-ID (diff)
From: Qinglang Miao <miaoqinglang@huawei.com>
To: Qiang Yu <yuq825@gmail.com>, David Airlie <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>
Cc: Qinglang Miao <miaoqinglang@huawei.com>,
	lima@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] drm/lima: fix reference leak in lima_pm_busy
Date: Fri, 27 Nov 2020 17:44:38 +0800	[thread overview]
Message-ID: <20201127094438.121003-1-miaoqinglang@huawei.com> (raw)

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: 50de2e9ebbc0 ("drm/lima: enable runtime pm")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
 drivers/gpu/drm/lima/lima_sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/lima/lima_sched.c b/drivers/gpu/drm/lima/lima_sched.c
index dc6df9e9a..f6e7a88a5 100644
--- a/drivers/gpu/drm/lima/lima_sched.c
+++ b/drivers/gpu/drm/lima/lima_sched.c
@@ -200,7 +200,7 @@ static int lima_pm_busy(struct lima_device *ldev)
 	int ret;
 
 	/* resume GPU if it has been suspended by runtime PM */
-	ret = pm_runtime_get_sync(ldev->dev);
+	ret = pm_runtime_resume_and_get(ldev->dev);
 	if (ret < 0)
 		return ret;
 
-- 
2.23.0

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             reply	other threads:[~2020-11-27  9:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-27  9:44 Qinglang Miao [this message]
2020-11-27  9:44 ` [PATCH] drm/lima: fix reference leak in lima_pm_busy Qinglang Miao
2021-01-30  6:31 ` Qiang Yu
2021-01-30  6:31   ` Qiang Yu

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