Protect against drivers that may try to register the connector more
than once, or who try to unregister it multiple times.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
---
drivers/gpu/drm/drm_crtc.c | 9 +++++++++
include/drm/drm_crtc.h | 1 +
2 files changed, 10 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 81641544ac3e..8b9ee921a9e1 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -1030,6 +1030,9 @@ int drm_connector_register(struct drm_connector *connector)
{
int ret;
+ if (connector->registered)
+ return 0;
+
ret = drm_sysfs_connector_add(connector);
if (ret)
return ret;
@@ -1047,6 +1050,7 @@ int drm_connector_register(struct drm_connector *connector)
drm_mode_object_register(connector->dev, &connector->base);
+ connector->registered = true;
return 0;
err_debugfs:
@@ -1065,11 +1069,16 @@ EXPORT_SYMBOL(drm_connector_register);
*/
void drm_connector_unregister(struct drm_connector *connector)
{
+ if (!connector->registered)
+ return;
+
if (connector->funcs->early_unregister)
connector->funcs->early_unregister(connector);
drm_sysfs_connector_remove(connector);
drm_debugfs_connector_remove(connector);
+
+ connector->registered = false;
}
EXPORT_SYMBOL(drm_connector_unregister);
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index 77b775cff4e7..35e47eea5ee1 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1212,6 +1212,7 @@ struct drm_connector {
bool interlace_allowed;
bool doublescan_allowed;
bool stereo_allowed;
+ bool registered;
struct list_head modes; /* list of modes on this connector */
enum drm_connector_status status;
--
2.8.1
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