mac80211: redefine usage of the mac80211 workqueue

The mac80211 workqueue exists to enable mac80211 and drivers
to queue their own work on a single threaded workqueue. mac80211
takes care to flush the workqueue during suspend but we never
really had requirements on drivers for how they should use
the workqueue in consideration for suspend.

We extend mac80211 to document how the mac80211 workqueue should
be used, how it should not be used and finally move raw access to
the workqueue to mac80211 only. Drivers and mac80211 use helpers
to queue work onto the mac80211 workqueue:

  * ieee80211_queue_work()
  * ieee80211_queue_delayed_work()

These helpers will now warn if mac80211 already completed its
suspend cycle and someone is trying to queue work. mac80211
flushes the mac80211 workqueue prior to suspend a few times,
but we haven't taken the care to ensure drivers won't add more
work after suspend. To help with this we add a warning when
someone tries to add work and mac80211 already completed the
suspend cycle.

Drivers should ensure they cancel any work or delayed work
in the mac80211 stop() callback.

Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 5 deletions

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index 9a38269..2f4f518 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -54,7 +54,7 @@ static void ieee80211_mesh_housekeeping_timer(unsigned long data)
 		return;
 	}
 
-	queue_work(local->hw.workqueue, &ifmsh->work);
+	ieee80211_queue_work(local->hw.workqueue, &ifmsh->work);
 }
 
 /**
@@ -357,7 +357,7 @@ static void ieee80211_mesh_path_timer(unsigned long data)
 		return;
 	}
 
-	queue_work(local->hw.workqueue, &ifmsh->work);
+	ieee80211_queue_work(local->hw.workqueue, &ifmsh->work);
 }
 
 struct mesh_table *mesh_table_grow(struct mesh_table *tbl)
@@ -471,7 +471,7 @@ void ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 	struct ieee80211_local *local = sdata->local;
 
 	ifmsh->housekeeping = true;
-	queue_work(local->hw.workqueue, &ifmsh->work);
+	ieee80211_queue_work(local->hw.workqueue, &ifmsh->work);
 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BEACON |
 						BSS_CHANGED_BEACON_ENABLED);
 }
@@ -619,7 +619,7 @@ void ieee80211_mesh_notify_scan_completed(struct ieee80211_local *local)
 	rcu_read_lock();
 	list_for_each_entry_rcu(sdata, &local->interfaces, list)
 		if (ieee80211_vif_is_mesh(&sdata->vif))
-			queue_work(local->hw.workqueue, &sdata->u.mesh.work);
+			ieee80211_queue_work(local->hw.workqueue, &sdata->u.mesh.work);
 	rcu_read_unlock();
 }
 
@@ -692,7 +692,7 @@ ieee80211_mesh_rx_mgmt(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 	case IEEE80211_STYPE_PROBE_RESP:
 	case IEEE80211_STYPE_BEACON:
 		skb_queue_tail(&ifmsh->skb_queue, skb);
-		queue_work(local->hw.workqueue, &ifmsh->work);
+		ieee80211_queue_work(local->hw.workqueue, &ifmsh->work);
 		return RX_QUEUED;
 	}