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>

net/wireless/core.c

@@ -346,9 +346,6 @@ int wiphy_register(struct wiphy *wiphy)
 	int i;
 	u16 ifmodes = wiphy->interface_modes;
 
-	if (WARN_ON(wiphy->max_scan_ssids < 1))
-		return -EINVAL;
-
 	/* sanity check ifmodes */
 	WARN_ON(!ifmodes);
 	ifmodes &= ((1 << __NL80211_IFTYPE_AFTER_LAST) - 1) & ~1;

net/wireless/wext-compat.c

@@ -247,6 +247,7 @@ int cfg80211_wext_giwrange(struct net_device *dev,
 	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWAP);
 	IW_EVENT_CAPA_SET(range->event_capa, SIOCGIWSCAN);
 
+	if (wdev->wiphy->max_scan_ssids > 0)
 		range->scan_capa |= IW_SCAN_CAPA_ESSID;
 
 	return 0;