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@chris-wilson.co.uk Cc: Dave Airlie airlied@redhat.com Cc: dri-devel@lists.freedesktop.org Reviewed-by: Daniel Vetter daniel.vetter@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 68b2385ee505..e01c0fcf26cc 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -1012,6 +1012,9 @@ 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; @@ -1029,6 +1032,7 @@ int drm_connector_register(struct drm_connector *connector)

drm_mode_object_register(connector->dev, &connector->base);

+ connector->registered = true; return 0;

err_debugfs: @@ -1047,11 +1051,16 @@ 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 e217c5d46010..8ca8e940a392 100644 --- a/include/drm/drm_crtc.h +++ b/include/drm/drm_crtc.h @@ -1165,6 +1165,7 @@ 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 @@ -1222,6 +1223,7 @@ 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;