rt2x00: Introduce beacon_update_locked that requires caller locking

Introduce a beacon_update_locked function that does not acquire the
according beacon mutex to allow beacon updates from atomic context. The
caller has to take care of synchronization.

No functional changes. Just preparation for beacon updates from tasklet
context.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 16 insertions, 8 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2x00queue.c b/drivers/net/wireless/rt2x00/rt2x00queue.c
index 24bcdb47a465..7d7fbe0315af 100644
--- a/drivers/net/wireless/rt2x00/rt2x00queue.c
+++ b/drivers/net/wireless/rt2x00/rt2x00queue.c
@@ -593,8 +593,8 @@ int rt2x00queue_clear_beacon(struct rt2x00_dev *rt2x00dev,
         return 0;
 }
 
-int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
-                              struct ieee80211_vif *vif)
+int rt2x00queue_update_beacon_locked(struct rt2x00_dev *rt2x00dev,
+                                     struct ieee80211_vif *vif)
 {
         struct rt2x00_intf *intf = vif_to_intf(vif);
         struct skb_frame_desc *skbdesc;
@@ -603,18 +603,14 @@ int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
         if (unlikely(!intf->beacon))
                 return -ENOBUFS;
 
-        mutex_lock(&intf->beacon_skb_mutex);
-
         /*
          * Clean up the beacon skb.
          */
         rt2x00queue_free_skb(intf->beacon);
 
         intf->beacon->skb = ieee80211_beacon_get(rt2x00dev->hw, vif);
-        if (!intf->beacon->skb) {
-                mutex_unlock(&intf->beacon_skb_mutex);
+        if (!intf->beacon->skb)
                 return -ENOMEM;
-        }
 
         /*
          * Copy all TX descriptor information into txdesc,
@@ -635,9 +631,21 @@ int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
          */
         rt2x00dev->ops->lib->write_beacon(intf->beacon, &txdesc);
 
+        return 0;
+
+}
+
+int rt2x00queue_update_beacon(struct rt2x00_dev *rt2x00dev,
+                              struct ieee80211_vif *vif)
+{
+        struct rt2x00_intf *intf = vif_to_intf(vif);
+        int ret;
+
+        mutex_lock(&intf->beacon_skb_mutex);
+        ret = rt2x00queue_update_beacon_locked(rt2x00dev, vif);
         mutex_unlock(&intf->beacon_skb_mutex);
 
-        return 0;
+        return ret;
 }
 
 void rt2x00queue_for_each_entry(struct data_queue *queue,