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I have attached a more conservative version of my prior patch for
scanning; it may help you if your Atheros card goes out to lunch.
Of course, reverse my previous patch.

Dave

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David Young             OJC Technologies
dyoung@ojctech.com      Urbana, IL * (217) 278-3933

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Index: ieee80211_node.c
===================================================================
RCS file: /cvsroot/src/sys/net80211/ieee80211_node.c,v
retrieving revision 1.44
diff -u -u -r1.44 ieee80211_node.c
--- ieee80211_node.c	25 Sep 2005 00:03:06 -0000	1.44
+++ ieee80211_node.c	24 Oct 2005 05:23:31 -0000
@@ -718,11 +718,8 @@
 				"%s: skip scan candidate %s, fails %u\n",
 				__func__, ether_sprintf(ni->ni_macaddr),
 				ni->ni_fails);
-			ni->ni_fails++;
-#if 0
 			if (ni->ni_fails++ > 2)
-				ieee80211_free_node(ni);
-#endif
+				ni->ni_fails = 0;
 			continue;
 		}
 		if (ieee80211_match_bss(ic, ni) == 0) {

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