NFC: Check if NCI data flow control is used

Check if NCI data flow control is used in nci_tx_work.

Signed-off-by: Ilan Elias <ilane@ti.com>
Acked-by: Lauro Ramos Venancio <lauro.venancio@openbossa.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/include/net/nfc/nci.h b/include/net/nfc/nci.h
index 0b34fde..cdbe671 100644
--- a/include/net/nfc/nci.h
+++ b/include/net/nfc/nci.h
@@ -108,6 +108,9 @@
 /* NCI Static RF connection ID */
 #define NCI_STATIC_RF_CONN_ID					0x00
 
+/* NCI Data Flow Control */
+#define NCI_DATA_FLOW_CONTROL_NOT_USED				0xff
+
 /* NCI RF_DISCOVER_MAP_CMD modes */
 #define NCI_DISC_MAP_MODE_POLL					0x01
 #define NCI_DISC_MAP_MODE_LISTEN				0x02