hci_cmd_sync_alloc
struct sk_buff *hci_cmd_sync_alloc(struct hci_dev *hdev, u16 opcode, u32 plen,
skb = hci_cmd_sync_alloc(hdev, opcode, plen, param, NULL);
skb = hci_cmd_sync_alloc(hdev, opcode, plen, param, NULL);
skb = hci_cmd_sync_alloc(hdev, opcode, plen, param, sk);