mac80211: sync driver before TX

In P2P client mode, the GO (AP) to connect to might
have periods of time where it is not available due
to powersave. To allow the driver to sync with it
and send frames to the GO only when it is available
add a new callback tx_sync (and the corresponding
finish_tx_sync). These callbacks can sleep unlike
the actual TX.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/net/mac80211/driver-ops.h b/net/mac80211/driver-ops.h
index b2d6bba44054..1425380983f7 100644
--- a/net/mac80211/driver-ops.h
+++ b/net/mac80211/driver-ops.h
@@ -130,6 +130,37 @@ static inline void drv_bss_info_changed(struct ieee80211_local *local,
         trace_drv_return_void(local);
 }
 
+static inline int drv_tx_sync(struct ieee80211_local *local,
+                              struct ieee80211_sub_if_data *sdata,
+                              const u8 *bssid,
+                              enum ieee80211_tx_sync_type type)
+{
+        int ret = 0;
+
+        might_sleep();
+
+        trace_drv_tx_sync(local, sdata, bssid, type);
+        if (local->ops->tx_sync)
+                ret = local->ops->tx_sync(&local->hw, &sdata->vif,
+                                          bssid, type);
+        trace_drv_return_int(local, ret);
+        return ret;
+}
+
+static inline void drv_finish_tx_sync(struct ieee80211_local *local,
+                                      struct ieee80211_sub_if_data *sdata,
+                                      const u8 *bssid,
+                                      enum ieee80211_tx_sync_type type)
+{
+        might_sleep();
+
+        trace_drv_finish_tx_sync(local, sdata, bssid, type);
+        if (local->ops->finish_tx_sync)
+                local->ops->finish_tx_sync(&local->hw, &sdata->vif,
+                                           bssid, type);
+        trace_drv_return_void(local);
+}
+
 static inline u64 drv_prepare_multicast(struct ieee80211_local *local,
                                         struct netdev_hw_addr_list *mc_list)
 {