From: Qinglang Miao <miaoqinglang@huawei.com>
To: Thierry Reding <thierry.reding@gmail.com>,
David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
Jonathan Hunter <jonathanh@nvidia.com>
Cc: <dri-devel@lists.freedesktop.org>, <linux-tegra@vger.kernel.org>,
<linux-kernel@vger.kernel.org>,
Qinglang Miao <miaoqinglang@huawei.com>
Subject: [PATCH] drm/tegra: fix reference leak when pm_runtime_get_sync fails
Date: Tue, 1 Dec 2020 20:56:31 +0800 [thread overview]
Message-ID: <20201201125631.142590-1-miaoqinglang@huawei.com> (raw)
The PM reference count is not expected to be incremented on
return in these tegra functions.
However, pm_runtime_get_sync will increment the PM reference
count even failed. Forgetting to putting operation will result
in a reference leak here.
Replace it with pm_runtime_resume_and_get to keep usage
counter balanced.
Fixes: fd67e9c6ed5a ("drm/tegra: Do not implement runtime PM")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
drivers/gpu/drm/tegra/dc.c | 2 +-
drivers/gpu/drm/tegra/dsi.c | 2 +-
drivers/gpu/drm/tegra/hdmi.c | 2 +-
drivers/gpu/drm/tegra/hub.c | 2 +-
drivers/gpu/drm/tegra/sor.c | 2 +-
drivers/gpu/drm/tegra/vic.c | 2 +-
6 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 424ad60b4..b2c8c68b7 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -2184,7 +2184,7 @@ static int tegra_dc_runtime_resume(struct host1x_client *client)
struct device *dev = client->dev;
int err;
- err = pm_runtime_get_sync(dev);
+ err = pm_runtime_resume_and_get(dev);
if (err < 0) {
dev_err(dev, "failed to get runtime PM: %d\n", err);
return err;
diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c
index 5691ef1b0..f46d377f0 100644
--- a/drivers/gpu/drm/tegra/dsi.c
+++ b/drivers/gpu/drm/tegra/dsi.c
@@ -1111,7 +1111,7 @@ static int tegra_dsi_runtime_resume(struct host1x_client *client)
struct device *dev = client->dev;
int err;
- err = pm_runtime_get_sync(dev);
+ err = pm_runtime_resume_and_get(dev);
if (err < 0) {
dev_err(dev, "failed to get runtime PM: %d\n", err);
return err;
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index d09a24931..e5d2a4026 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -1510,7 +1510,7 @@ static int tegra_hdmi_runtime_resume(struct host1x_client *client)
struct device *dev = client->dev;
int err;
- err = pm_runtime_get_sync(dev);
+ err = pm_runtime_resume_and_get(dev);
if (err < 0) {
dev_err(dev, "failed to get runtime PM: %d\n", err);
return err;
diff --git a/drivers/gpu/drm/tegra/hub.c b/drivers/gpu/drm/tegra/hub.c
index 22a03f7ff..5ce771cba 100644
--- a/drivers/gpu/drm/tegra/hub.c
+++ b/drivers/gpu/drm/tegra/hub.c
@@ -789,7 +789,7 @@ static int tegra_display_hub_runtime_resume(struct host1x_client *client)
unsigned int i;
int err;
- err = pm_runtime_get_sync(dev);
+ err = pm_runtime_resume_and_get(dev);
if (err < 0) {
dev_err(dev, "failed to get runtime PM: %d\n", err);
return err;
diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index e88a17c29..fa1272155 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -3214,7 +3214,7 @@ static int tegra_sor_runtime_resume(struct host1x_client *client)
struct device *dev = client->dev;
int err;
- err = pm_runtime_get_sync(dev);
+ err = pm_runtime_resume_and_get(dev);
if (err < 0) {
dev_err(dev, "failed to get runtime PM: %d\n", err);
return err;
diff --git a/drivers/gpu/drm/tegra/vic.c b/drivers/gpu/drm/tegra/vic.c
index ade56b860..b77f72630 100644
--- a/drivers/gpu/drm/tegra/vic.c
+++ b/drivers/gpu/drm/tegra/vic.c
@@ -314,7 +314,7 @@ static int vic_open_channel(struct tegra_drm_client *client,
struct vic *vic = to_vic(client);
int err;
- err = pm_runtime_get_sync(vic->dev);
+ err = pm_runtime_resume_and_get(vic->dev);
if (err < 0)
return err;
--
2.23.0
next reply other threads:[~2020-12-01 12:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-01 12:56 Qinglang Miao [this message]
2021-01-15 16:26 ` Thierry Reding
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