zd1211rw: fix ack_pending in filter_ack causing tx-packet ordering problem on monitor

For reasons not very clear yet to me, filter_ack leaves matching tx-packet
pending with 'ack_pending'. This causes tx-packet to be passed back to upper
layer after next packet has been transfered and tx-packets might end up
coming come out of monitor interface in wrong order vs. rx.

Because of this when enable AP-mode, hostapd monitor interface would get
packets in wrong order causing problems in WPA association.

So don't use mac->ack_pending when in AP-mode.

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/net/wireless/zd1211rw/zd_mac.c b/drivers/net/wireless/zd1211rw/zd_mac.c
index ab0d1b9a08ec..84ac95eb59fa 100644
--- a/drivers/net/wireless/zd1211rw/zd_mac.c
+++ b/drivers/net/wireless/zd1211rw/zd_mac.c
@@ -799,6 +799,13 @@ static int filter_ack(struct ieee80211_hw *hw, struct ieee80211_hdr *rx_hdr,
 
                 mac->ack_pending = 1;
                 mac->ack_signal = stats->signal;
+
+                /* Prevent pending tx-packet on AP-mode */
+                if (mac->type == NL80211_IFTYPE_AP) {
+                        skb = __skb_dequeue(q);
+                        zd_mac_tx_status(hw, skb, mac->ack_signal, NULL);
+                        mac->ack_pending = 0;
+                }
         }
 
         spin_unlock_irqrestore(&q->lock, flags);