static void xen_blkbk_unmap_and_respond_callback(int result, struct gntab_unmap_queue_data *data)
{
	struct pending_req *pending_req = (struct pending_req *)(data->data);
	struct xen_blkif_ring *ring = pending_req->ring;
	struct xen_blkif *blkif = ring->blkif;

	/* BUG_ON used to reproduce existing behaviour,
	   but is this the best way to deal with this? */
	BUG_ON(result);

	put_free_pages(ring, data->pages, data->count);
	make_response(ring, pending_req->id,
		      pending_req->operation, pending_req->status);
	free_req(ring, pending_req);
	/*
	 * Make sure the request is freed before releasing blkif,
	 * or there could be a race between free_req and the
	 * cleanup done in xen_blkif_free during shutdown.
	 *
	 * NB: The fact that we might try to wake up pending_free_wq
	 * before drain_complete (in case there's a drain going on)
	 * it's not a problem with our current implementation
	 * because we can assure there's no thread waiting on
	 * pending_free_wq if there's a drain going on, but it has
	 * to be taken into account if the current model is changed.
	 */
	if (atomic_dec_and_test(&ring->inflight) && atomic_read(&blkif->drain)) {
		complete(&blkif->drain_complete);
	}
	xen_blkif_put(blkif);
}

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