Index: madwifi-ng-r2568-20070710/ath_rate/minstrel/minstrel.c
===================================================================
--- madwifi-ng-r2568-20070710.orig/ath_rate/minstrel/minstrel.c	2007-10-20 20:52:09.000000000 +0200
+++ madwifi-ng-r2568-20070710/ath_rate/minstrel/minstrel.c	2007-10-20 20:52:46.000000000 +0200
@@ -675,6 +675,12 @@
 		}
 
 		for (x = 0; x < ni->ni_rates.rs_nrates; x++) {
+			if (sn->rates[x].rix == 0xff) {
+				DPRINTF(sc, "%s: %s ignore bogus rix at %d\n",
+					dev_info, __func__, x);
+				continue;
+			}
+
 			sn->rs_rateattempts	[x] = 0;
 			sn->rs_thisprob		[x] = 0;
 			sn->rs_ratesuccess 	[x] = 0;