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authorChristian Lamparter <chunkeey@web.de>2009-07-07 19:08:07 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-07-24 15:05:06 -0400
commite0f114e82e3781087a0ad0e92c94ff0d55012c1a (patch)
treed4c7cfa485360952b3da9fee7acc07efcfdcc7d8 /drivers/net/wireless/p54/txrx.c
parent0a2b8bb24d4eb67788edd71d1ef8aa86c2e17e0f (diff)
p54: re-enable power save feature
This patch re-enables p54's power save features and adds a workaround which temporarily alters the device's power state in order to allow ps-polls to be sent and buffered data to be retrieved during psm. (Incorporates patch originally posted as "p54: fix beacon template dtim IE corruption". -- JWL) Signed-off-by: Christian Lamparter <chunkeey@web.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/p54/txrx.c')
-rw-r--r--drivers/net/wireless/p54/txrx.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/net/wireless/p54/txrx.c b/drivers/net/wireless/p54/txrx.c
index 6426d2cae6d..01eadb1683f 100644
--- a/drivers/net/wireless/p54/txrx.c
+++ b/drivers/net/wireless/p54/txrx.c
@@ -288,6 +288,45 @@ static int p54_rssi_to_dbm(struct p54_common *priv, int rssi)
priv->rssical_db[band].add) / 4;
}
+/*
+ * Even if the firmware is capable of dealing with incoming traffic,
+ * while dozing, we have to prepared in case mac80211 uses PS-POLL
+ * to retrieve outstanding frames from our AP.
+ * (see comment in net/mac80211/mlme.c @ line 1993)
+ */
+static void p54_pspoll_workaround(struct p54_common *priv, struct sk_buff *skb)
+{
+ struct ieee80211_hdr *hdr = (void *) skb->data;
+ struct ieee80211_tim_ie *tim_ie;
+ u8 *tim;
+ u8 tim_len;
+ bool new_psm;
+
+ /* only beacons have a TIM IE */
+ if (!ieee80211_is_beacon(hdr->frame_control))
+ return;
+
+ if (!priv->aid)
+ return;
+
+ /* only consider beacons from the associated BSSID */
+ if (compare_ether_addr(hdr->addr3, priv->bssid))
+ return;
+
+ tim = p54_find_ie(skb, WLAN_EID_TIM);
+ if (!tim)
+ return;
+
+ tim_len = tim[1];
+ tim_ie = (struct ieee80211_tim_ie *) &tim[2];
+
+ new_psm = ieee80211_check_tim(tim_ie, tim_len, priv->aid);
+ if (new_psm != priv->powersave_override) {
+ priv->powersave_override = new_psm;
+ p54_set_ps(priv);
+ }
+}
+
static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
{
struct p54_rx_data *hdr = (struct p54_rx_data *) skb->data;
@@ -340,6 +379,9 @@ static int p54_rx_data(struct p54_common *priv, struct sk_buff *skb)
skb_pull(skb, header_len);
skb_trim(skb, le16_to_cpu(hdr->len));
+ if (unlikely(priv->hw->conf.flags & IEEE80211_CONF_PS))
+ p54_pspoll_workaround(priv, skb);
+
ieee80211_rx_irqsafe(priv->hw, skb);
queue_delayed_work(priv->hw->workqueue, &priv->work,