--- /dev/null
+Index: madwifi-ng-r2568-20070710/ath_rate/minstrel/minstrel.c
+===================================================================
+--- madwifi-ng-r2568-20070710.orig/ath_rate/minstrel/minstrel.c 2007-08-11 02:08:15.931956005 +0200
++++ madwifi-ng-r2568-20070710/ath_rate/minstrel/minstrel.c 2007-08-11 02:09:37.572608440 +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;