From: "Luis R. Rodriguez" <lrodriguez@xxxxxxxxxxx> We don't want to trigger moving between PS mode during scan, because then we will sometimes end up sending nullfunc frames during scan. We're supposed to only send one prior to scan and after scan. This fixes an oops which occured due to an assert in ath9k: http://marc.info/?l=linux-wireless&m=124277331319024 The assert was happening because the rate control algorithm figures it should find at least one valid dual stream or single stream rate. Since we allow mac80211 to send nullfunc frames during scan and dynamic PS was enabled at times we ended up trying to send nullfunc frames for the target sta on the wrong band for which we have no valid rate to communicate with it. This breaks the assumptions in rate control. We determine we also need to disable moving between PS modes when not associated so lets just add that now as well, and we should not have a ps_sdata when that interface cannot actually go into PS because it's not associated. Signed-off-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx> Signed-off-by: Johannes Berg <johannes@xxxxxxxxxxxxxxxx> --- While testing when I was sleep walking I noticed I couldn't switch to a different AP. The new changes here fixed that. I'm not seeing any more strange deadbeef stuff with this series now. net/mac80211/mlme.c | 6 ++---- net/mac80211/tx.c | 3 ++- 2 files changed, 4 insertions(+), 5 deletions(-) --- wireless-testing.orig/net/mac80211/tx.c 2009-06-09 23:13:34.000000000 +0200 +++ wireless-testing/net/mac80211/tx.c 2009-06-10 14:58:32.000000000 +0200 @@ -1415,7 +1415,8 @@ int ieee80211_master_start_xmit(struct s } if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) && - local->hw.conf.dynamic_ps_timeout > 0) { + local->hw.conf.dynamic_ps_timeout > 0 && + !local->sw_scanning && !local->hw_scanning && local->ps_sdata) { if (local->hw.conf.flags & IEEE80211_CONF_PS) { ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_QUEUE_STOP_REASON_PS); --- wireless-testing.orig/net/mac80211/mlme.c 2009-06-10 14:58:36.000000000 +0200 +++ wireless-testing/net/mac80211/mlme.c 2009-06-10 15:15:41.000000000 +0200 @@ -621,9 +621,6 @@ static void ieee80211_change_ps(struct i struct ieee80211_conf *conf = &local->hw.conf; if (local->ps_sdata) { - if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)) - return; - ieee80211_enable_ps(local, local->ps_sdata); } else if (conf->flags & IEEE80211_CONF_PS) { conf->flags &= ~IEEE80211_CONF_PS; @@ -653,7 +650,8 @@ void ieee80211_recalc_ps(struct ieee8021 count++; } - if (count == 1 && found->u.mgd.powersave) { + if (count == 1 && found->u.mgd.powersave && + (found->u.mgd.flags & IEEE80211_STA_ASSOCIATED)) { s32 beaconint_us; if (latency < 0) -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
