linux-kernel - RE: [PATCH] drm/radeon: Fix reference count leaks caused by pm_runtime_get

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Date:   Tue, 16 Jun 2020 03:26:23 +0000
From:   "Quan, Evan" <Evan.Quan@....com>
To:     Aditya Pakki <pakki001@....edu>
CC:     "wu000273@....edu" <wu000273@....edu>,
        David Airlie <airlied@...ux.ie>, "kjlu@....edu" <kjlu@....edu>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        Daniel Vetter <daniel@...ll.ch>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>
Subject: RE: [PATCH] drm/radeon: Fix reference count leaks caused by
 pm_runtime_get_sync

[AMD Official Use Only - Internal Distribution Only]

Acked-by: Evan Quan <evan.quan@....com>

-----Original Message-----
From: amd-gfx <amd-gfx-bounces@...ts.freedesktop.org> On Behalf Of Aditya Pakki
Sent: Sunday, June 14, 2020 10:21 AM
To: pakki001@....edu
Cc: wu000273@....edu; David Airlie <airlied@...ux.ie>; kjlu@....edu; linux-kernel@...r.kernel.org; amd-gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org; Daniel Vetter <daniel@...ll.ch>; Deucher, Alexander <Alexander.Deucher@....com>; Koenig, Christian <Christian.Koenig@....com>
Subject: [PATCH] drm/radeon: Fix reference count leaks caused by pm_runtime_get_sync

On calling pm_runtime_get_sync() the reference count of the device is incremented. In case of failure, decrement the reference count before returning the error.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/gpu/drm/radeon/radeon_display.c | 4 +++-
 drivers/gpu/drm/radeon/radeon_drv.c     | 4 +++-
 drivers/gpu/drm/radeon/radeon_kms.c     | 4 +++-
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index 35db79a168bf..df1a7eb73651 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -635,8 +635,10 @@ radeon_crtc_set_config(struct drm_mode_set *set,
 dev = set->crtc->dev;

 ret = pm_runtime_get_sync(dev->dev);
-if (ret < 0)
+if (ret < 0) {
+pm_runtime_put_autosuspend(dev->dev);
 return ret;
+}

 ret = drm_crtc_helper_set_config(set, ctx);

diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index bbb0883e8ce6..62b5069122cc 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -549,8 +549,10 @@ long radeon_drm_ioctl(struct file *filp,
 long ret;
 dev = file_priv->minor->dev;
 ret = pm_runtime_get_sync(dev->dev);
-if (ret < 0)
+if (ret < 0) {
+pm_runtime_put_autosuspend(dev->dev);
 return ret;
+}

 ret = drm_ioctl(filp, cmd, arg);

diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index c5d1dc9618a4..99ee60f8b604 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -638,8 +638,10 @@ int radeon_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
 file_priv->driver_priv = NULL;

 r = pm_runtime_get_sync(dev->dev);
-if (r < 0)
+if (r < 0) {
+pm_runtime_put_autosuspend(dev->dev);
 return r;
+}

 /* new gpu have virtual address space support */
 if (rdev->family >= CHIP_CAYMAN) {
--
2.25.1

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