From: Navid Emamdoost <navid.emamdoost@gmail.com>
To: "Alex Deucher" <alexander.deucher@amd.com>,
"Christian König" <christian.koenig@amd.com>,
"David Airlie" <airlied@linux.ie>,
"Daniel Vetter" <daniel@ffwll.ch>,
"Lyude Paul" <lyude@redhat.com>,
"Ville Syrjälä" <ville.syrjala@linux.intel.com>,
"José Roberto de Souza" <jose.souza@intel.com>,
"Andrzej Pietrasiewicz" <andrzej.p@collabora.com>,
"Navid Emamdoost" <navid.emamdoost@gmail.com>,
amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Cc: emamd001@umn.edu, kjlu@umn.edu, wu000273@umn.edu, smccaman@umn.edu
Subject: [PATCH] drm/amdgpu/display: fix ref count leak when pm_runtime_get_sync fails
Date: Sun, 14 Jun 2020 02:05:28 -0500 [thread overview]
Message-ID: <20200614070530.56366-1-navid.emamdoost@gmail.com> (raw)
The call to pm_runtime_get_sync increments the counter even in case of
failure, leading to incorrect ref count.
In case of failure, decrement the ref count before returning.
Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
index f355d9a752d2..a1aec205435d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_connectors.c
@@ -716,8 +716,10 @@ amdgpu_connector_lvds_detect(struct drm_connector *connector, bool force)
if (!drm_kms_helper_is_poll_worker()) {
r = pm_runtime_get_sync(connector->dev->dev);
- if (r < 0)
+ if (r < 0) {
+ pm_runtime_put_autosuspend(connector->dev->dev);
return connector_status_disconnected;
+ }
}
if (encoder) {
@@ -854,8 +856,10 @@ amdgpu_connector_vga_detect(struct drm_connector *connector, bool force)
if (!drm_kms_helper_is_poll_worker()) {
r = pm_runtime_get_sync(connector->dev->dev);
- if (r < 0)
+ if (r < 0) {
+ pm_runtime_put_autosuspend(connector->dev->dev);
return connector_status_disconnected;
+ }
}
encoder = amdgpu_connector_best_single_encoder(connector);
@@ -977,8 +981,10 @@ amdgpu_connector_dvi_detect(struct drm_connector *connector, bool force)
if (!drm_kms_helper_is_poll_worker()) {
r = pm_runtime_get_sync(connector->dev->dev);
- if (r < 0)
+ if (r < 0) {
+ pm_runtime_put_autosuspend(connector->dev->dev);
return connector_status_disconnected;
+ }
}
if (!force && amdgpu_connector_check_hpd_status_unchanged(connector)) {
@@ -1328,8 +1334,10 @@ amdgpu_connector_dp_detect(struct drm_connector *connector, bool force)
if (!drm_kms_helper_is_poll_worker()) {
r = pm_runtime_get_sync(connector->dev->dev);
- if (r < 0)
+ if (r < 0) {
+ pm_runtime_put_autosuspend(connector->dev->dev);
return connector_status_disconnected;
+ }
}
if (!force && amdgpu_connector_check_hpd_status_unchanged(connector)) {
--
2.17.1
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reply other threads:[~2020-06-15 7:29 UTC|newest]
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