linux-kernel - [patch 010/123] mac80211: Reset dynamic ps timer in Rx path.

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Message-Id: <20100313001506.065002368@kvm.kroah.org>
Date:	Fri, 12 Mar 2010 16:11:48 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Vivek Natarajan <vnatarajan@...eros.com>,
	"John W. Linville" <linville@...driver.com>
Subject: [patch 010/123] mac80211: Reset dynamic ps timer in Rx path.

2.6.33-stable review patch.  If anyone has any objections, please let me know.

-----------------

From: Vivek Natarajan <vnatarajan@...eros.com>

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@...eros.com>
Signed-off-by: John W. Linville <linville@...driver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/mac80211/rx.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -1788,6 +1788,7 @@ static ieee80211_rx_result debug_noinlin
 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;
@@ -1819,6 +1820,13 @@ ieee80211_rx_h_data(struct ieee80211_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;


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