mirror of https://gitee.com/openkylin/linux.git
Merge tag 'drm-misc-fixes-2017-12-06' of git://anongit.freedesktop.org/drm/drm-misc into drm-fixes
Just the connector_iter corner-case regression fix. * tag 'drm-misc-fixes-2017-12-06' of git://anongit.freedesktop.org/drm/drm-misc: drm: safely free connectors from connector_iter
This commit is contained in:
commit
bd3a3a2e92
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@ -152,6 +152,16 @@ static void drm_connector_free(struct kref *kref)
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connector->funcs->destroy(connector);
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connector->funcs->destroy(connector);
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}
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}
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static void drm_connector_free_work_fn(struct work_struct *work)
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{
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struct drm_connector *connector =
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container_of(work, struct drm_connector, free_work);
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struct drm_device *dev = connector->dev;
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drm_mode_object_unregister(dev, &connector->base);
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connector->funcs->destroy(connector);
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}
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/**
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/**
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* drm_connector_init - Init a preallocated connector
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* drm_connector_init - Init a preallocated connector
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* @dev: DRM device
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* @dev: DRM device
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@ -181,6 +191,8 @@ int drm_connector_init(struct drm_device *dev,
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if (ret)
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if (ret)
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return ret;
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return ret;
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INIT_WORK(&connector->free_work, drm_connector_free_work_fn);
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connector->base.properties = &connector->properties;
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connector->base.properties = &connector->properties;
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connector->dev = dev;
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connector->dev = dev;
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connector->funcs = funcs;
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connector->funcs = funcs;
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@ -529,6 +541,18 @@ void drm_connector_list_iter_begin(struct drm_device *dev,
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}
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}
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EXPORT_SYMBOL(drm_connector_list_iter_begin);
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EXPORT_SYMBOL(drm_connector_list_iter_begin);
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/*
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* Extra-safe connector put function that works in any context. Should only be
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* used from the connector_iter functions, where we never really expect to
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* actually release the connector when dropping our final reference.
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*/
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static void
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drm_connector_put_safe(struct drm_connector *conn)
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{
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if (refcount_dec_and_test(&conn->base.refcount.refcount))
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schedule_work(&conn->free_work);
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}
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/**
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/**
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* drm_connector_list_iter_next - return next connector
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* drm_connector_list_iter_next - return next connector
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* @iter: connectr_list iterator
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* @iter: connectr_list iterator
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@ -561,7 +585,7 @@ drm_connector_list_iter_next(struct drm_connector_list_iter *iter)
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spin_unlock_irqrestore(&config->connector_list_lock, flags);
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spin_unlock_irqrestore(&config->connector_list_lock, flags);
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if (old_conn)
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if (old_conn)
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drm_connector_put(old_conn);
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drm_connector_put_safe(old_conn);
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return iter->conn;
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return iter->conn;
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}
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}
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@ -580,7 +604,7 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
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{
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{
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iter->dev = NULL;
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iter->dev = NULL;
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if (iter->conn)
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if (iter->conn)
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drm_connector_put(iter->conn);
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drm_connector_put_safe(iter->conn);
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lock_release(&connector_list_iter_dep_map, 0, _RET_IP_);
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lock_release(&connector_list_iter_dep_map, 0, _RET_IP_);
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}
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}
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EXPORT_SYMBOL(drm_connector_list_iter_end);
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EXPORT_SYMBOL(drm_connector_list_iter_end);
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@ -431,6 +431,8 @@ void drm_mode_config_cleanup(struct drm_device *dev)
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drm_connector_put(connector);
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drm_connector_put(connector);
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}
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}
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drm_connector_list_iter_end(&conn_iter);
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drm_connector_list_iter_end(&conn_iter);
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/* connector_iter drops references in a work item. */
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flush_scheduled_work();
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if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
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if (WARN_ON(!list_empty(&dev->mode_config.connector_list))) {
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_for_each_connector_iter(connector, &conn_iter)
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drm_for_each_connector_iter(connector, &conn_iter)
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@ -916,6 +916,14 @@ struct drm_connector {
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uint8_t num_h_tile, num_v_tile;
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uint8_t num_h_tile, num_v_tile;
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uint8_t tile_h_loc, tile_v_loc;
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uint8_t tile_h_loc, tile_v_loc;
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uint16_t tile_h_size, tile_v_size;
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uint16_t tile_h_size, tile_v_size;
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/**
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* @free_work:
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*
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* Work used only by &drm_connector_iter to be able to clean up a
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* connector from any context.
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*/
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struct work_struct free_work;
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};
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};
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#define obj_to_connector(x) container_of(x, struct drm_connector, base)
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#define obj_to_connector(x) container_of(x, struct drm_connector, base)
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