cfg80211: allow drivers that can't scan for specific ssids

Signed-off-by: David Kilroy <kilroyd@googlemail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/wireless/wext-compat.c b/net/wireless/wext-compat.c
index 7dbe6c6..bb97061 100644
--- a/net/wireless/wext-compat.c
+++ b/net/wireless/wext-compat.c
@@ -247,7 +247,8 @@
 	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWAP);
 	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWSCAN);
 
-	range->scan_capa |= IW_SCAN_CAPA_ESSID;
+	if (wdev->wiphy->max_scan_ssids > 0)
+		range->scan_capa |= IW_SCAN_CAPA_ESSID;
 
 	return 0;
 }