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 at chris-wilson.co.uk>
Cc: Dave Airlie <airlied at redhat.com>
Cc: dri-devel at lists.freedesktop.org
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/drm_crtc.c | 9 +++++++++
include/drm/drm_crtc.h | 2 ++
2 files changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 23dfec41decb..ea5ec641eacc 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -984,6 +984,9 @@ 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;
@@ -1001,6 +1004,7 @@ int drm_connector_register(struct drm_connector
*connector)
drm_mode_object_register(connector->dev, &connector->base);
+ connector->registered = true;
return 0;
err_debugfs:
@@ -1019,11 +1023,16 @@ 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 0c35b4f73e4c..e38b88696ff0 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1194,6 +1194,7 @@ struct drm_encoder {
* @interlace_allowed: can this connector handle interlaced modes?
* @doublescan_allowed: can this connector handle doublescan?
* @stereo_allowed: can this connector handle stereo modes?
+ * @registered: is this connector exposed (registered) with userspace?
* @modes: modes available on this connector (from fill_modes() + user)
* @status: one of the drm_connector_status enums (connected, not, or unknown)
* @probed_modes: list of modes derived directly from the display
@@ -1250,6 +1251,7 @@ 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
