mac80211: Fix queuing of scan containing a SSID

This patch fixes scanning for specific ssid's which is broken due to the
scan being queued up without respecting the ssid to scan for.
Signed-off-by: Helmut Schaa <hschaa@suse.de>
Signed-off-by: Jiri Benc <jbenc@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ieee80211_i.h

@@ -241,6 +241,8 @@ struct ieee80211_if_sta {
 	u8 bssid[ETH_ALEN], prev_bssid[ETH_ALEN];
 	u8 ssid[IEEE80211_MAX_SSID_LEN];
 	size_t ssid_len;
+	u8 scan_ssid[IEEE80211_MAX_SSID_LEN];
+	size_t scan_ssid_len;
 	u16 aid;
 	u16 ap_capab, capab;
 	u8 *extra_ie; /* to be added to the end of AssocReq */

net/mac80211/ieee80211_sta.c

@@ -1998,6 +1998,9 @@ void ieee80211_sta_work(struct work_struct *work)
 	if (ifsta->state != IEEE80211_AUTHENTICATE &&
 	    ifsta->state != IEEE80211_ASSOCIATE &&
 	    test_and_clear_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request)) {
+		if (ifsta->scan_ssid_len)
+			ieee80211_sta_start_scan(dev, ifsta->scan_ssid, ifsta->scan_ssid_len);
+		else
 			ieee80211_sta_start_scan(dev, NULL, 0);
 		return;
 	}
@@ -2868,6 +2871,9 @@ int ieee80211_sta_req_scan(struct net_device *dev, u8 *ssid, size_t ssid_len)
 		return -EBUSY;
 	}
 
+	ifsta->scan_ssid_len = ssid_len;
+	if (ssid_len)
+		memcpy(ifsta->scan_ssid, ssid, ssid_len);
 	set_bit(IEEE80211_STA_REQ_SCAN, &ifsta->request);
 	queue_work(local->hw.workqueue, &ifsta->work);
 	return 0;