mac80211: destroy virtual monitor interface across suspend

It has to be removed from the driver, but completely
destroying it helps handle unplug of a device during
suspend since then the channel context handling etc.
doesn't have to happen later when it's removed.

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

4 files changed, 11 insertions, 6 deletions

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 693c1812b7bc..55fb382a8199 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -1336,6 +1336,8 @@ void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
                                     const int offset);
 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up);
 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata);
+int ieee80211_add_virtual_monitor(struct ieee80211_local *local);
+void ieee80211_del_virtual_monitor(struct ieee80211_local *local);
 
 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata);
 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata);
diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 75b322f9d945..d0d5f20f1ec4 100644
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -346,7 +346,7 @@ static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 }
 
-static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
+int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 {
         struct ieee80211_sub_if_data *sdata;
         int ret = 0;
@@ -400,7 +400,7 @@ static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
         return ret;
 }
 
-static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
+void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 {
         struct ieee80211_sub_if_data *sdata;
 
diff --git a/net/mac80211/pm.c b/net/mac80211/pm.c
index b98d927dd0f3..d1c021b62fe5 100644
--- a/net/mac80211/pm.c
+++ b/net/mac80211/pm.c
@@ -21,6 +21,8 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
 
         ieee80211_roc_purge(local, NULL);
 
+        ieee80211_del_virtual_monitor(local);
+
         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
                 mutex_lock(&local->sta_mtx);
                 list_for_each_entry(sta, &local->sta_list, list) {
@@ -103,10 +105,6 @@ int __ieee80211_suspend(struct ieee80211_hw *hw, struct cfg80211_wowlan *wowlan)
                 drv_remove_interface(local, sdata);
         }
 
-        sdata = rtnl_dereference(local->monitor_sdata);
-        if (sdata)
-                drv_remove_interface(local, sdata);
-
         /*
          * We disconnected on all interfaces before suspend, all channel
          * contexts should be released.
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index f9581c6378ae..43465b6e4778 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -1461,6 +1461,8 @@ int ieee80211_reconfig(struct ieee80211_local *local)
         /* add interfaces */
         sdata = rtnl_dereference(local->monitor_sdata);
         if (sdata) {
+                /* in HW restart it exists already */
+                WARN_ON(local->resuming);
                 res = drv_add_interface(local, sdata);
                 if (WARN_ON(res)) {
                         rcu_assign_pointer(local->monitor_sdata, NULL);
@@ -1650,6 +1652,9 @@ int ieee80211_reconfig(struct ieee80211_local *local)
         local->in_reconfig = false;
         barrier();
 
+        if (local->monitors == local->open_count && local->monitors > 0)
+                ieee80211_add_virtual_monitor(local);
+
         /*
          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
          * sessions can be established after a resume.