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drm: Zero out DRM object memory upon cleanup

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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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Thierry Reding 2014-12-10 11:38:49 +01:00 committed by Daniel Vetter
parent 393e872e1d
commit a18c0af171
1 changed files with 10 additions and 1 deletions
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11
drivers/gpu/drm/drm_crtc.c
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@ -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);