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authorJouni Malinen <jouni.malinen@atheros.com>2009-05-19 17:01:42 +0300
committerJohn W. Linville <linville@tuxdriver.com>2009-05-20 14:46:33 -0400
commitdc8c4585d2e6f3bf5c9d8c0a6036b591bd3baf2e (patch)
treef5d1d1ca8e5c00ada9c46edfffb87eee54ce2c31 /drivers
parentaa68aeaaff8bbf58e355eb83b7d0c14ce82b2f12 (diff)
ath9k: Set PM field in frame control when in PS mode
mac80211 does not set PM field for normal data frames, so we need to update that based on the current PS mode when using PS-Poll (timeout=0) power save mode. This allows the AP to remain in sync with our PS state. However, there is still a potential race condition between PS state changes when multiple TX queues are used and nullfunc and PS-Poll frames use different queue. That corner case may need to be handled separately by changing which queue is used either in ath9k or mac80211. Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/ath/ath9k/main.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
index d6545b3538b..77fbc46624b 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -2088,6 +2088,21 @@ static int ath9k_tx(struct ieee80211_hw *hw,
goto exit;
}
+ if (sc->hw->conf.flags & IEEE80211_CONF_PS) {
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+ /*
+ * mac80211 does not set PM field for normal data frames, so we
+ * need to update that based on the current PS mode.
+ */
+ if (ieee80211_is_data(hdr->frame_control) &&
+ !ieee80211_is_nullfunc(hdr->frame_control) &&
+ !ieee80211_has_pm(hdr->frame_control)) {
+ DPRINTF(sc, ATH_DBG_PS, "Add PM=1 for a TX frame "
+ "while in PS mode\n");
+ hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
+ }
+ }
+
if (unlikely(sc->sc_ah->power_mode != ATH9K_PM_AWAKE)) {
/*
* We are using PS-Poll and mac80211 can request TX while in