From 608383bfc04aa222c3e9e896c32f56a5e5deaff0 Mon Sep 17 00:00:00 2001 From: Helmut Schaa Date: Mon, 30 Jan 2012 15:18:00 +0100 Subject: mac80211: Fix incorrect num_sta_ps decrement in ap_sta_ps_end If the driver blocked this specific STA with the help of ieee80211_sta_block_awake we won't clear WLAN_STA_PS_STA later but still decrement num_sta_ps. Hence, the next data frame from this STA will trigger ap_sta_ps_end again and also decrement num_sta_ps again leading to an incorrect num_sta_ps counter. This can result in problems with powersaving clients not waking up from PS because the TIM calculation might be skipped due to the incorrect num_sta_ps counter. Signed-off-by: Helmut Schaa Signed-off-by: John W. Linville --- net/mac80211/sta_info.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'net/mac80211/sta_info.c') diff --git a/net/mac80211/sta_info.c b/net/mac80211/sta_info.c index 0c79593b1bb..1fb4770a7d1 100644 --- a/net/mac80211/sta_info.c +++ b/net/mac80211/sta_info.c @@ -997,9 +997,11 @@ EXPORT_SYMBOL(ieee80211_find_sta); static void clear_sta_ps_flags(void *_sta) { struct sta_info *sta = _sta; + struct ieee80211_sub_if_data *sdata = sta->sdata; clear_sta_flag(sta, WLAN_STA_PS_DRIVER); - clear_sta_flag(sta, WLAN_STA_PS_STA); + if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) + atomic_dec(&sdata->bss->num_sta_ps); } /* powersave support code */ -- cgit v1.2.3