[Bluetooth]: Move packet type into the SKB control buffer

This patch moves the usage of packet type into the SKB control
buffer. After this patch it is now possible to shrink the sk_buff
structure and redefine its pkt_type.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/bluetooth/btuart_cs.c

@@ -211,9 +211,9 @@ static void btuart_receive(btuart_info_t *info)
 		if (info->rx_state == RECV_WAIT_PACKET_TYPE) {
 
 			info->rx_skb->dev = (void *) info->hdev;
-			info->rx_skb->pkt_type = inb(iobase + UART_RX);
+			bt_cb(info->rx_skb)->pkt_type = inb(iobase + UART_RX);
 
-			switch (info->rx_skb->pkt_type) {
+			switch (bt_cb(info->rx_skb)->pkt_type) {
 
 			case HCI_EVENT_PKT:
 				info->rx_state = RECV_WAIT_EVENT_HEADER;
@@ -232,7 +232,7 @@ static void btuart_receive(btuart_info_t *info)
 
 			default:
 				/* Unknown packet */
-				BT_ERR("Unknown HCI packet with type 0x%02x received", info->rx_skb->pkt_type);
+				BT_ERR("Unknown HCI packet with type 0x%02x received", bt_cb(info->rx_skb)->pkt_type);
 				info->hdev->stat.err_rx++;
 				clear_bit(HCI_RUNNING, &(info->hdev->flags));
 
@@ -447,7 +447,7 @@ static int btuart_hci_send_frame(struct sk_buff *skb)
 
 	info = (btuart_info_t *)(hdev->driver_data);
 
-	switch (skb->pkt_type) {
+	switch (bt_cb(skb)->pkt_type) {
 	case HCI_COMMAND_PKT:
 		hdev->stat.cmd_tx++;
 		break;
@@ -460,7 +460,7 @@ static int btuart_hci_send_frame(struct sk_buff *skb)
 	};
 
 	/* Prepend skb with frame type */
-	memcpy(skb_push(skb, 1), &(skb->pkt_type), 1);
+	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 	skb_queue_tail(&(info->txq), skb);
 
 	btuart_write_wakeup(info);