mac80211: Retry null data frame for power save.

Even if the null data frame is not acked by the AP, mac80211
goes into power save. This might lead to loss of frames
from the AP.
Prevent this by restarting dynamic_ps_timer when ack is not
received for null data frames.

Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 414d774028ba..314e98173166 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -945,6 +945,11 @@ enum ieee80211_tkip_key_type {
  *      Hardware supports Unscheduled Automatic Power Save Delivery
  *      (U-APSD) in managed mode. The mode is configured with
  *      conf_tx() operation.
+ *
+ * @IEEE80211_HW_REPORTS_TX_ACK_STATUS:
+ *      Hardware can provide ack status reports of Tx frames to
+ *      the stack.
+ *
  */
 enum ieee80211_hw_flags {
         IEEE80211_HW_HAS_RATE_CONTROL                   = 1<<0,
@@ -965,6 +970,7 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_SUPPORTS_STATIC_SMPS               = 1<<15,
         IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS              = 1<<16,
         IEEE80211_HW_SUPPORTS_UAPSD                     = 1<<17,
+        IEEE80211_HW_REPORTS_TX_ACK_STATUS              = 1<<18,
 };
 
 /**