From 72eaa43a532b4156966444779829a986a4432f11 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 26 Nov 2008 15:02:58 +0100 Subject: [PATCH] mac80211: only transition STAs ps->wake on data frames When a station goes to PS mode to scan, it will then send probe requests without the PS bit set. mac80211 will take that as indication that the station woke up, but it didn't. This patch changes mac80211 to only consider doze->wake transitions on data frames to to fix that issue. Signed-off-by: Johannes Berg Cc: Jouni Malinen Signed-off-by: John W. Linville --- net/mac80211/rx.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c index 648a1d0e6c82..68a6e973c72c 100644 --- a/net/mac80211/rx.c +++ b/net/mac80211/rx.c @@ -741,17 +741,29 @@ ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) sta->last_qual = rx->status->qual; sta->last_noise = rx->status->noise; + /* + * Change STA power saving mode only at the end of a frame + * exchange sequence. + */ if (!ieee80211_has_morefrags(hdr->frame_control) && (rx->sdata->vif.type == NL80211_IFTYPE_AP || rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { - /* Change STA power saving mode only in the end of a frame - * exchange sequence */ - if (test_sta_flags(sta, WLAN_STA_PS) && - !ieee80211_has_pm(hdr->frame_control)) - rx->sent_ps_buffered += ap_sta_ps_end(sta); - else if (!test_sta_flags(sta, WLAN_STA_PS) && - ieee80211_has_pm(hdr->frame_control)) - ap_sta_ps_start(sta); + if (test_sta_flags(sta, WLAN_STA_PS)) { + /* + * Ignore doze->wake transitions that are + * indicated by non-data frames, the standard + * is unclear here, but for example going to + * PS mode and then scanning would cause a + * doze->wake transition for the probe request, + * and that is clearly undesirable. + */ + if (ieee80211_is_data(hdr->frame_control) && + !ieee80211_has_pm(hdr->frame_control)) + rx->sent_ps_buffered += ap_sta_ps_end(sta); + } else { + if (ieee80211_has_pm(hdr->frame_control)) + ap_sta_ps_start(sta); + } } /* Drop data::nullfunc frames silently, since they are used only to