static int sbp2_scsi_queuecommand()

in sbp2.c [1441:1489]
40 lines of code
6 McCabe index (conditional complexity)

static int sbp2_scsi_queuecommand(struct Scsi_Host *shost,
				  struct scsi_cmnd *cmd)
{
	struct sbp2_logical_unit *lu = cmd->device->hostdata;
	struct fw_device *device = target_parent_device(lu->tgt);
	struct sbp2_command_orb *orb;
	int generation, retval = SCSI_MLQUEUE_HOST_BUSY;

	orb = kzalloc(sizeof(*orb), GFP_ATOMIC);
	if (orb == NULL)
		return SCSI_MLQUEUE_HOST_BUSY;

	/* Initialize rcode to something not RCODE_COMPLETE. */
	orb->base.rcode = -1;
	kref_init(&orb->base.kref);
	orb->cmd = cmd;
	orb->request.next.high = cpu_to_be32(SBP2_ORB_NULL);
	orb->request.misc = cpu_to_be32(
		COMMAND_ORB_MAX_PAYLOAD(lu->tgt->max_payload) |
		COMMAND_ORB_SPEED(device->max_speed) |
		COMMAND_ORB_NOTIFY);

	if (cmd->sc_data_direction == DMA_FROM_DEVICE)
		orb->request.misc |= cpu_to_be32(COMMAND_ORB_DIRECTION);

	generation = device->generation;
	smp_rmb();    /* sbp2_map_scatterlist looks at tgt->address_high */

	if (scsi_sg_count(cmd) && sbp2_map_scatterlist(orb, device, lu) < 0)
		goto out;

	memcpy(orb->request.command_block, cmd->cmnd, cmd->cmd_len);

	orb->base.callback = complete_command_orb;
	orb->base.request_bus =
		dma_map_single(device->card->device, &orb->request,
			       sizeof(orb->request), DMA_TO_DEVICE);
	if (dma_mapping_error(device->card->device, orb->base.request_bus)) {
		sbp2_unmap_scatterlist(device->card->device, orb);
		goto out;
	}

	sbp2_send_orb(&orb->base, lu, lu->tgt->node_id, generation,
		      lu->command_block_agent_address + SBP2_ORB_POINTER);
	retval = 0;
 out:
	kref_put(&orb->base.kref, free_orb);
	return retval;
}