hci_cmd_sync
skb = hci_cmd_sync(ctx->hdev, ctx->op_read, sizeof(cp), &cp,
skb = hci_cmd_sync(ctx->hdev, ctx->op_write, plen, cp, HCI_CMD_TIMEOUT);
struct sk_buff *hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
EXPORT_SYMBOL(hci_cmd_sync);