mac80211: Reset dynamic ps timer in Rx path.

The current mac80211 implementation enables power save if there
is no Tx traffic for a specific timeout. Hence, PS is triggered
even if there is a continuous Rx only traffic(like UDP) going on.
This makes the drivers to wait on the tim bit in the next beacon
to awake which leads to redundant sleep-wake cycles.
Fix this by restarting the dynamic ps timer on receiving every
data packet.

Signed-off-by: Vivek Natarajan <vnatarajan@atheros.com>
CC: stable@kernel.org
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 01dba7618397..c9755f3d986c 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1719,6 +1719,7 @@ static ieee80211_rx_result debug_noinline
 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
 {
         struct ieee80211_sub_if_data *sdata = rx->sdata;
+        struct ieee80211_local *local = rx->local;
         struct net_device *dev = sdata->dev;
         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
         __le16 fc = hdr->frame_control;
@@ -1750,6 +1751,13 @@ ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
         dev->stats.rx_packets++;
         dev->stats.rx_bytes += rx->skb->len;
 
+        if (ieee80211_is_data(hdr->frame_control) &&
+            !is_multicast_ether_addr(hdr->addr1) &&
+            local->hw.conf.dynamic_ps_timeout > 0 && local->ps_sdata) {
+                        mod_timer(&local->dynamic_ps_timer, jiffies +
+                         msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
+        }
+
         ieee80211_deliver_skb(rx);
 
         return RX_QUEUED;