mac80211: do not start any work during reconfigure flow

It is not a good idea to try to perform any work (e.g. send an auth
frame) during reconfigure flow.

Prevent this from happening, and at the end of the reconfigure flow
requeue all the works.

Signed-off-by: Naftali Goldstein <naftali.goldstein@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 682d0ab..a86fcae 100644 (file)
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -2038,6 +2038,13 @@ void __ieee80211_flush_queues(struct ieee80211_local *local,
 static inline bool ieee80211_can_run_worker(struct ieee80211_local *local)
 {
        /*
+        * It's unsafe to try to do any work during reconfigure flow.
+        * When the flow ends the work will be requeued.
+        */
+       if (local->in_reconfig)
+               return false;
+
+       /*
         * If quiescing is set, we are racing with __ieee80211_suspend.
         * __ieee80211_suspend flushes the workers after setting quiescing,
         * and we check quiescing / suspended before enqueing new workers.

diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 1c8384f..e2edc2a 100644 (file)
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -2480,6 +2480,10 @@ int ieee80211_reconfig(struct ieee80211_local *local)
                mutex_lock(&local->mtx);
                ieee80211_start_next_roc(local);
                mutex_unlock(&local->mtx);
+
+               /* Requeue all works */
+               list_for_each_entry(sdata, &local->interfaces, list)
+                       ieee80211_queue_work(&local->hw, &sdata->work);
        }
 
        ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,