mac80211: Reset dynamic ps timer in Rx path.

commit e15276a4b220c54db665cf46a92bd9ceb9aeb052 upstream.

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>
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>

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 16c6cdc6e8af363b8ffeda0e6f301dead6440c83..538a7d733ea9e81c67ade09685663500d3532559 100644 (file)
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1590,6 +1590,7 @@ static ieee80211_rx_result debug_noinline
 ieee80211_rx_h_data(struct ieee80211_rx_data *rx)
 {
        struct net_device *dev = rx->dev;
+       struct ieee80211_local *local = rx->local;
        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
        __le16 fc = hdr->frame_control;
        int err;
@@ -1612,6 +1613,13 @@ 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;