From 2b730daacee6c318bce7b6373c19909e36a74590 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Tue, 26 Mar 2013 22:23:20 +0100 Subject: [PATCH] mac80211: don't start new netdev queues if driver stopped If a new netdev (e.g. an AP VLAN) is created while the driver has queues stopped, the new netdev queues will be started even though they shouldn't. This will lead to frames accumulating on the internal mac80211 pending queues instead of properly being held on the netdev queues. Signed-off-by: Johannes Berg --- net/mac80211/iface.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c index 63b63675aa6d..b6abaaa3676f 100644 --- a/net/mac80211/iface.c +++ b/net/mac80211/iface.c @@ -639,8 +639,28 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up) ieee80211_recalc_ps(local, -1); - if (dev) - netif_tx_start_all_queues(dev); + if (dev) { + unsigned long flags; + int n_acs = IEEE80211_NUM_ACS; + int ac; + + if (local->hw.queues < IEEE80211_NUM_ACS) + n_acs = 1; + + spin_lock_irqsave(&local->queue_stop_reason_lock, flags); + if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE || + (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 && + skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) { + for (ac = 0; ac < n_acs; ac++) { + int ac_queue = sdata->vif.hw_queue[ac]; + + if (local->queue_stop_reasons[ac_queue] == 0 && + skb_queue_empty(&local->pending[ac_queue])) + netif_start_subqueue(dev, ac); + } + } + spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags); + } return 0; err_del_interface: