mac80211: Fix ieee80211_sta_conn_mon_timer with hw connection monitoring

When IEEE80211_HW_CONNECTION_MONITOR is configured by the driver, starting
of ieee80211_sta_conn_mon_timer should be prevented, as it is then not needed.

This is currently partially the case. As it seems, when a probe-response is
received from the AP the timer is still restarted, thus restarting the host
based connection keep-alive mechanism. These probe-responses happen at least
when scanning while associated.

Fix this by preventing starting of the ieee80211_sta_conn_mon_timer in the
ieee80211_rx_mgmt_probe_resp function.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index d11a54c..d811e3f 100644 (file)
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -1330,12 +1330,17 @@ static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
                mutex_lock(&sdata->local->iflist_mtx);
                ieee80211_recalc_ps(sdata->local, -1);
                mutex_unlock(&sdata->local->iflist_mtx);
+
+               if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
+                       return;
+
                /*
                 * We've received a probe response, but are not sure whether
                 * we have or will be receiving any beacons or data, so let's
                 * schedule the timers again, just in case.
                 */
                mod_beacon_timer(sdata);
+
                mod_timer(&ifmgd->conn_mon_timer,
                          round_jiffies_up(jiffies +
                                           IEEE80211_CONNECTION_IDLE_TIME));