Release a struct request_queue when it is no longer needed
void blk_release_queue(struct kobject * kobj);
kobj
the kobj belonging to the request queue to be released
blk_release_queue is the pair to blk_init_queue or blk_queue_make_request. It should be called when a request queue is being released; typically when a block device is being de-registered. Currently, its primary task it to free all the struct request structures that were allocated to the queue and the queue itself.
The low level driver must have finished any outstanding requests first via blk_cleanup_queue.