mac80211: Retry null data frame for power save

commit 375177bf35efc08e1bd37bbda4cc0c8cc4db8500 upstream.

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>
Signed-off-by: Luis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 15bcb56106ec..f39b303944dd 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -926,6 +926,9 @@ enum ieee80211_tkip_key_type {
  * @IEEE80211_HW_BEACON_FILTER:
  *      Hardware supports dropping of irrelevant beacon frames to
  *      avoid waking up cpu.
+ * @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,
@@ -943,6 +946,7 @@ enum ieee80211_hw_flags {
         IEEE80211_HW_SUPPORTS_DYNAMIC_PS                = 1<<12,
         IEEE80211_HW_MFP_CAPABLE                        = 1<<13,
         IEEE80211_HW_BEACON_FILTER                      = 1<<14,
+        IEEE80211_HW_REPORTS_TX_ACK_STATUS              = 1<<15,
 };
 
 /**