static void bt3c_receive()

in bt3c_cs.c [216:331]

• 84 lines of code
• 14 McCabe index (conditional complexity)

static void bt3c_receive(struct bt3c_info *info)
{
	unsigned int iobase;
	int size = 0, avail;

	if (!info) {
		BT_ERR("Unknown device");
		return;
	}

	iobase = info->p_dev->resource[0]->start;

	avail = bt3c_read(iobase, 0x7006);

	bt3c_address(iobase, 0x7480);
	while (size < avail) {
		size++;
		info->hdev->stat.byte_rx++;

		/* Allocate packet */
		if (!info->rx_skb) {
			info->rx_state = RECV_WAIT_PACKET_TYPE;
			info->rx_count = 0;
			info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
			if (!info->rx_skb) {
				BT_ERR("Can't allocate mem for new packet");
				return;
			}
		}


		if (info->rx_state == RECV_WAIT_PACKET_TYPE) {

			hci_skb_pkt_type(info->rx_skb) = inb(iobase + DATA_L);
			inb(iobase + DATA_H);

			switch (hci_skb_pkt_type(info->rx_skb)) {

			case HCI_EVENT_PKT:
				info->rx_state = RECV_WAIT_EVENT_HEADER;
				info->rx_count = HCI_EVENT_HDR_SIZE;
				break;

			case HCI_ACLDATA_PKT:
				info->rx_state = RECV_WAIT_ACL_HEADER;
				info->rx_count = HCI_ACL_HDR_SIZE;
				break;

			case HCI_SCODATA_PKT:
				info->rx_state = RECV_WAIT_SCO_HEADER;
				info->rx_count = HCI_SCO_HDR_SIZE;
				break;

			default:
				/* Unknown packet */
				BT_ERR("Unknown HCI packet with type 0x%02x received",
				       hci_skb_pkt_type(info->rx_skb));
				info->hdev->stat.err_rx++;

				kfree_skb(info->rx_skb);
				info->rx_skb = NULL;
				break;

			}

		} else {

			__u8 x = inb(iobase + DATA_L);

			skb_put_u8(info->rx_skb, x);
			inb(iobase + DATA_H);
			info->rx_count--;

			if (info->rx_count == 0) {

				int dlen;
				struct hci_event_hdr *eh;
				struct hci_acl_hdr *ah;
				struct hci_sco_hdr *sh;

				switch (info->rx_state) {

				case RECV_WAIT_EVENT_HEADER:
					eh = hci_event_hdr(info->rx_skb);
					info->rx_state = RECV_WAIT_DATA;
					info->rx_count = eh->plen;
					break;

				case RECV_WAIT_ACL_HEADER:
					ah = hci_acl_hdr(info->rx_skb);
					dlen = __le16_to_cpu(ah->dlen);
					info->rx_state = RECV_WAIT_DATA;
					info->rx_count = dlen;
					break;

				case RECV_WAIT_SCO_HEADER:
					sh = hci_sco_hdr(info->rx_skb);
					info->rx_state = RECV_WAIT_DATA;
					info->rx_count = sh->dlen;
					break;

				case RECV_WAIT_DATA:
					hci_recv_frame(info->hdev, info->rx_skb);
					info->rx_skb = NULL;
					break;

				}

			}

		}

	}

	bt3c_io_write(iobase, 0x7006, 0x0000);
}