static int handle_at_packet()

in ohci.c [1425:1504]

• 56 lines of code
• 18 McCabe index (conditional complexity)

static int handle_at_packet(struct context *context,
			    struct descriptor *d,
			    struct descriptor *last)
{
	struct driver_data *driver_data;
	struct fw_packet *packet;
	struct fw_ohci *ohci = context->ohci;
	int evt;

	if (last->transfer_status == 0 && !context->flushing)
		/* This descriptor isn't done yet, stop iteration. */
		return 0;

	driver_data = (struct driver_data *) &d[3];
	packet = driver_data->packet;
	if (packet == NULL)
		/* This packet was cancelled, just continue. */
		return 1;

	if (packet->payload_mapped)
		dma_unmap_single(ohci->card.device, packet->payload_bus,
				 packet->payload_length, DMA_TO_DEVICE);

	evt = le16_to_cpu(last->transfer_status) & 0x1f;
	packet->timestamp = le16_to_cpu(last->res_count);

	log_ar_at_event(ohci, 'T', packet->speed, packet->header, evt);

	switch (evt) {
	case OHCI1394_evt_timeout:
		/* Async response transmit timed out. */
		packet->ack = RCODE_CANCELLED;
		break;

	case OHCI1394_evt_flushed:
		/*
		 * The packet was flushed should give same error as
		 * when we try to use a stale generation count.
		 */
		packet->ack = RCODE_GENERATION;
		break;

	case OHCI1394_evt_missing_ack:
		if (context->flushing)
			packet->ack = RCODE_GENERATION;
		else {
			/*
			 * Using a valid (current) generation count, but the
			 * node is not on the bus or not sending acks.
			 */
			packet->ack = RCODE_NO_ACK;
		}
		break;

	case ACK_COMPLETE + 0x10:
	case ACK_PENDING + 0x10:
	case ACK_BUSY_X + 0x10:
	case ACK_BUSY_A + 0x10:
	case ACK_BUSY_B + 0x10:
	case ACK_DATA_ERROR + 0x10:
	case ACK_TYPE_ERROR + 0x10:
		packet->ack = evt - 0x10;
		break;

	case OHCI1394_evt_no_status:
		if (context->flushing) {
			packet->ack = RCODE_GENERATION;
			break;
		}
		fallthrough;

	default:
		packet->ack = RCODE_SEND_ERROR;
		break;
	}

	packet->callback(packet, &ohci->card, packet->ack);

	return 1;
}