iwlwifi: mvm: delay enabling smart FIFO until after beacon RX

If we have no beacon data before association, delay smart FIFO
enablement until after we have this data.

Not doing so can cause association failures in extremely silent
environments (usually only a shielded box/room) as beacon RX is
not sent to the host immediately, and then the association time
event ends without the host receiving any beacon even though it
was on the air - it's just stuck on the FIFO.

Cc: <stable@vger.kernel.org> [3.14]
Fixes: 1f3b0ff8ecce ("iwlwifi: mvm: Add Smart FIFO support")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

2 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
index 4dd9ff43b8b6..f0cebf12c7b8 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
@@ -1332,6 +1332,7 @@ static void iwl_mvm_bss_info_changed_station(struct iwl_mvm *mvm,
                  */
                 iwl_mvm_remove_time_event(mvm, mvmvif,
                                           &mvmvif->time_event_data);
+                iwl_mvm_sf_update(mvm, vif, false);
                 WARN_ON(iwl_mvm_enable_beacon_filter(mvm, vif, CMD_SYNC));
         } else if (changes & (BSS_CHANGED_PS | BSS_CHANGED_P2P_PS |
                               BSS_CHANGED_QOS)) {
diff --git a/drivers/net/wireless/iwlwifi/mvm/sf.c b/drivers/net/wireless/iwlwifi/mvm/sf.c
index 8401627c0030..88809b2d1654 100644
--- a/drivers/net/wireless/iwlwifi/mvm/sf.c
+++ b/drivers/net/wireless/iwlwifi/mvm/sf.c
@@ -274,7 +274,8 @@ int iwl_mvm_sf_update(struct iwl_mvm *mvm, struct ieee80211_vif *changed_vif,
                                 return -EINVAL;
                         if (changed_vif->type != NL80211_IFTYPE_STATION) {
                                 new_state = SF_UNINIT;
-                        } else if (changed_vif->bss_conf.assoc) {
+                        } else if (changed_vif->bss_conf.assoc &&
+                                   changed_vif->bss_conf.dtim_period) {
                                 mvmvif = iwl_mvm_vif_from_mac80211(changed_vif);
                                 sta_id = mvmvif->ap_sta_id;
                                 new_state = SF_FULL_ON;