From: Thierry Reding treding@nvidia.com
Drivers where the DRM objects have a lifetime that extends beyond that of the DRM device need to zero out the DRM object memory to void stale data such as properties. The DRM core code expects to operate on newly allocated and zeroed out objects and will behave unexpectedly, such as add duplicate properties, otherwise.
Signed-off-by: Thierry Reding treding@nvidia.com --- drivers/gpu/drm/drm_crtc.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c index 4c9aaf8e6176..4e35d2f74e0f 100644 --- a/drivers/gpu/drm/drm_crtc.c +++ b/drivers/gpu/drm/drm_crtc.c @@ -725,6 +725,8 @@ void drm_crtc_cleanup(struct drm_crtc *crtc) WARN_ON(crtc->state && !crtc->funcs->atomic_destroy_state); if (crtc->state && crtc->funcs->atomic_destroy_state) crtc->funcs->atomic_destroy_state(crtc, crtc->state); + + memset(crtc, 0, sizeof(*crtc)); } EXPORT_SYMBOL(drm_crtc_cleanup);
@@ -927,6 +929,8 @@ void drm_connector_cleanup(struct drm_connector *connector) if (connector->state && connector->funcs->atomic_destroy_state) connector->funcs->atomic_destroy_state(connector, connector->state); + + memset(connector, 0, sizeof(*connector)); } EXPORT_SYMBOL(drm_connector_cleanup);
@@ -1068,6 +1072,8 @@ void drm_bridge_cleanup(struct drm_bridge *bridge) list_del(&bridge->head); dev->mode_config.num_bridge--; drm_modeset_unlock_all(dev); + + memset(bridge, 0, sizeof(*bridge)); } EXPORT_SYMBOL(drm_bridge_cleanup);
@@ -1134,10 +1140,11 @@ void drm_encoder_cleanup(struct drm_encoder *encoder) drm_modeset_lock_all(dev); drm_mode_object_put(dev, &encoder->base); kfree(encoder->name); - encoder->name = NULL; list_del(&encoder->head); dev->mode_config.num_encoder--; drm_modeset_unlock_all(dev); + + memset(encoder, 0, sizeof(*encoder)); } EXPORT_SYMBOL(drm_encoder_cleanup);
@@ -1257,6 +1264,8 @@ void drm_plane_cleanup(struct drm_plane *plane) WARN_ON(plane->state && !plane->funcs->atomic_destroy_state); if (plane->state && plane->funcs->atomic_destroy_state) plane->funcs->atomic_destroy_state(plane, plane->state); + + memset(plane, 0, sizeof(*plane)); } EXPORT_SYMBOL(drm_plane_cleanup);