Explain in a comment why two wscons_keydesc structures are needed.

diff --git a/sys/dev/usb/ucc.c b/sys/dev/usb/ucc.c
index b526623..0c87925 100644 (file)
--- a/sys/dev/usb/ucc.c
+++ b/sys/dev/usb/ucc.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: ucc.c,v 1.23 2021/09/01 10:41:39 anton Exp $  */
+/*     $OpenBSD: ucc.c,v 1.24 2021/09/02 15:15:12 anton Exp $  */
 
 /*
  * Copyright (c) 2021 Anton Lindqvist <anton@openbsd.org>
@@ -82,6 +82,10 @@ struct ucc_softc {
                u_char  sc_last_raw;
        };
 
+       /*
+        * Only the first element is populated whereas the second remains zeroed
+        * out since such trailing sentinel is required by wskbd_load_keymap().
+        */
        struct wscons_keydesc     sc_keydesc[2];
        struct wskbd_mapdata      sc_keymap;
 };