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/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c
index aff09a1cf64f..7218dbabad3e 100644
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -1875,8 +1875,8 @@ static void at76_dwork_hw_scan(struct work_struct *work)
         /* FIXME: add maximum time for scan to complete */
 
         if (ret != CMD_STATUS_COMPLETE) {
-                queue_delayed_work(priv->hw->workqueue, &priv->dwork_hw_scan,
-                                   SCAN_POLL_INTERVAL);
+                ieee80211_queue_delayed_work(priv->hw, &priv->dwork_hw_scan,
+                                             SCAN_POLL_INTERVAL);
                 mutex_unlock(&priv->mtx);
                 return;
         }
@@ -1937,8 +1937,8 @@ static int at76_hw_scan(struct ieee80211_hw *hw,
                 goto exit;
         }
 
-        queue_delayed_work(priv->hw->workqueue, &priv->dwork_hw_scan,
-                           SCAN_POLL_INTERVAL);
+        ieee80211_queue_delayed_work(priv->hw, &priv->dwork_hw_scan,
+                                     SCAN_POLL_INTERVAL);
 
 exit:
         mutex_unlock(&priv->mtx);
@@ -2027,7 +2027,7 @@ static void at76_configure_filter(struct ieee80211_hw *hw,
         } else
                 return;
 
-        queue_work(hw->workqueue, &priv->work_set_promisc);
+        ieee80211_queue_work(hw, &priv->work_set_promisc);
 }
 
 static int at76_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,