From 5b714c6a3753dad0798a70a049e15c7f6bc9446b Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Fri, 27 Aug 2010 13:45:28 +0200 Subject: [PATCH] mac80211: fix offchannel queue stop Somebody noticed this problem, and I outlined to them how to fix it, but haven't heard back from them. So while I was adding the state field I figured I could use it to fix it. The problem, as I understand it, is that when we go offchannel while the driver has a queue stopped, the driver will likely start draining the queue and then enable it while offchannel. This in turn will enable the interface queue, and that leads to transmitting data frames on the wrong channel. Fix this by keeping track of offchannel status per interface, and not enabling the interface queues on interfaces that are offchannel when the driver enables a queue. Signed-off-by: Johannes Berg Signed-off-by: John W. Linville --- net/mac80211/ieee80211_i.h | 3 +++ net/mac80211/offchannel.c | 19 +++++++++++++++++-- net/mac80211/util.c | 5 ++++- 3 files changed, 24 insertions(+), 3 deletions(-) diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index d529bd5eab47..9af50fbcd48b 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -477,9 +477,12 @@ enum ieee80211_sub_if_data_flags { * @SDATA_STATE_RUNNING: virtual interface is up & running; this * mirrors netif_running() but is separate for interface type * change handling while the interface is up + * @SDATA_STATE_OFFCHANNEL: This interface is currently in offchannel + * mode, so queues are stopped */ enum ieee80211_sdata_state_bits { SDATA_STATE_RUNNING, + SDATA_STATE_OFFCHANNEL, }; struct ieee80211_sub_if_data { diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c index c36b1911987a..eeacaa59380a 100644 --- a/net/mac80211/offchannel.c +++ b/net/mac80211/offchannel.c @@ -112,8 +112,10 @@ void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local) * used from user space controlled off-channel operations. */ if (sdata->vif.type != NL80211_IFTYPE_STATION && - sdata->vif.type != NL80211_IFTYPE_MONITOR) + sdata->vif.type != NL80211_IFTYPE_MONITOR) { + set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); netif_tx_stop_all_queues(sdata->dev); + } } mutex_unlock(&local->iflist_mtx); } @@ -131,6 +133,7 @@ void ieee80211_offchannel_stop_station(struct ieee80211_local *local) continue; if (sdata->vif.type == NL80211_IFTYPE_STATION) { + set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); netif_tx_stop_all_queues(sdata->dev); if (sdata->u.mgd.associated) ieee80211_offchannel_ps_enable(sdata); @@ -155,8 +158,20 @@ void ieee80211_offchannel_return(struct ieee80211_local *local, ieee80211_offchannel_ps_disable(sdata); } - if (sdata->vif.type != NL80211_IFTYPE_MONITOR) + if (sdata->vif.type != NL80211_IFTYPE_MONITOR) { + clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state); + /* + * This may wake up queues even though the driver + * currently has them stopped. This is not very + * likely, since the driver won't have gotten any + * (or hardly any) new packets while we weren't + * on the right channel, and even if it happens + * it will at most lead to queueing up one more + * packet per queue in mac80211 rather than on + * the interface qdisc. + */ netif_tx_wake_all_queues(sdata->dev); + } /* re-enable beaconing */ if (enable_beaconing && diff --git a/net/mac80211/util.c b/net/mac80211/util.c index d38b3767e8cc..bd40b11d5ab9 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -283,8 +283,11 @@ static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue, if (skb_queue_empty(&local->pending[queue])) { rcu_read_lock(); - list_for_each_entry_rcu(sdata, &local->interfaces, list) + list_for_each_entry_rcu(sdata, &local->interfaces, list) { + if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) + continue; netif_wake_subqueue(sdata->dev, queue); + } rcu_read_unlock(); } else tasklet_schedule(&local->tx_pending_tasklet);