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authorVivek Natarajan <vnatarajan@atheros.com>2010-02-09 14:50:28 +0530
committerJohn W. Linville <linville@tuxdriver.com>2010-02-09 14:10:05 -0500
commit375177bf35efc08e1bd37bbda4cc0c8cc4db8500 (patch)
tree88774b1a46072fd3b0418b36d39d447b78fbfc51 /net/mac80211/status.c
parente15276a4b220c54db665cf46a92bd9ceb9aeb052 (diff)
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>
Diffstat (limited to 'net/mac80211/status.c')
-rw-r--r--net/mac80211/status.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/net/mac80211/status.c b/net/mac80211/status.c
index e57ad6b1d7e..ded98730c11 100644
--- a/net/mac80211/status.c
+++ b/net/mac80211/status.c
@@ -188,6 +188,7 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
rcu_read_lock();
sband = local->hw.wiphy->bands[info->band];
+ fc = hdr->frame_control;
for_each_sta_info(local, hdr->addr1, sta, tmp) {
/* skip wrong virtual interface */
@@ -205,8 +206,6 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
return;
}
- fc = hdr->frame_control;
-
if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
(ieee80211_is_data_qos(fc))) {
u16 tid, ssn;
@@ -275,6 +274,20 @@ void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
local->dot11FailedCount++;
}
+ if (ieee80211_is_nullfunc(fc) && ieee80211_has_pm(fc) &&
+ (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
+ !(info->flags & IEEE80211_TX_CTL_INJECTED) &&
+ local->ps_sdata && !(local->scanning)) {
+ if (info->flags & IEEE80211_TX_STAT_ACK) {
+ local->ps_sdata->u.mgd.flags |=
+ IEEE80211_STA_NULLFUNC_ACKED;
+ ieee80211_queue_work(&local->hw,
+ &local->dynamic_ps_enable_work);
+ } else
+ mod_timer(&local->dynamic_ps_timer, jiffies +
+ msecs_to_jiffies(10));
+ }
+
/* this was a transmitted frame, but now we want to reuse it */
skb_orphan(skb);