mac80211: recalculate min channel width on VHT opmode changes

When an associated station changes its VHT operating mode this
can/will affect the bandwidth it's using, and consequently we
must recalculate the minimum bandwidth we need to use. Failure
to do so can lead to one of two scenarios:
 1) we use a too high bandwidth, this is benign
 2) we use a too narrow bandwidth, causing rate control and
    actual PHY configuration to be out of sync, which can in
    turn cause problems/crashes

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 41497b6..d37ae7d 100644 (file)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -6,6 +6,7 @@
  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright (c) 2016        Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -1295,6 +1296,26 @@ static void ieee80211_iface_work(struct work_struct *work)
                } else if (ieee80211_is_action(mgmt->frame_control) &&
                           mgmt->u.action.category == WLAN_CATEGORY_VHT) {
                        switch (mgmt->u.action.u.vht_group_notif.action_code) {
+                       case WLAN_VHT_ACTION_OPMODE_NOTIF: {
+                               struct ieee80211_rx_status *status;
+                               enum nl80211_band band;
+                               u8 opmode;
+
+                               status = IEEE80211_SKB_RXCB(skb);
+                               band = status->band;
+                               opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
+
+                               mutex_lock(&local->sta_mtx);
+                               sta = sta_info_get_bss(sdata, mgmt->sa);
+
+                               if (sta)
+                                       ieee80211_vht_handle_opmode(sdata, sta,
+                                                                   opmode,
+                                                                   band);
+
+                               mutex_unlock(&local->sta_mtx);
+                               break;
+                       }
                        case WLAN_VHT_ACTION_GROUPID_MGMT:
                                ieee80211_process_mu_groups(sdata, mgmt);
                                break;

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index c87e613..3090dd4 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2881,17 +2881,10 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
 
                switch (mgmt->u.action.u.vht_opmode_notif.action_code) {
                case WLAN_VHT_ACTION_OPMODE_NOTIF: {
-                       u8 opmode;
-
                        /* verify opmode is present */
                        if (len < IEEE80211_MIN_ACTION_SIZE + 2)
                                goto invalid;
-
-                       opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
-
-                       ieee80211_vht_handle_opmode(rx->sdata, rx->sta,
-                                                   opmode, status->band);
-                       goto handled;
+                       goto queue;
                }
                case WLAN_VHT_ACTION_GROUPID_MGMT: {
                        if (len < IEEE80211_MIN_ACTION_SIZE + 25)

diff --git a/net/mac80211/vht.c b/net/mac80211/vht.c
index 6832bf6..43e45bb 100644 (file)
--- a/net/mac80211/vht.c
+++ b/net/mac80211/vht.c
@@ -527,8 +527,10 @@ void ieee80211_vht_handle_opmode(struct ieee80211_sub_if_data *sdata,
 
        u32 changed = __ieee80211_vht_handle_opmode(sdata, sta, opmode, band);
 
-       if (changed > 0)
+       if (changed > 0) {
+               ieee80211_recalc_min_chandef(sdata);
                rate_control_rate_update(local, sband, sta, changed);
+       }
 }
 
 void ieee80211_get_vht_mask_from_cap(__le16 vht_cap,