--- zzzz-none-000/linux-3.10.107/include/linux/usb/wusb.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/linux/usb/wusb.h	2021-02-04 17:41:59.000000000 +0000
@@ -271,6 +271,8 @@
 #define WUSB_KEY_INDEX_TYPE_GTK			2
 #define WUSB_KEY_INDEX_ORIGINATOR_HOST		0
 #define WUSB_KEY_INDEX_ORIGINATOR_DEVICE	1
+/* bits 0-3 used for the key index. */
+#define WUSB_KEY_INDEX_MAX			15
 
 /* A CCM Nonce, defined in WUSB1.0[6.4.1] */
 struct aes_ccm_nonce {