mac80211: fix start_seq_num in Rx reorder offload

sta->last_seq_ctrl is the seq_ctrl field from the last header
seen, need to shift it 4 bits to extract the sequence number.
Otherwise the ieee80211_sn_less() check at the top of
ieee80211_sta_manage_reorder_buf drops frames until the sequence
number catches up.

Cc: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Denton Gentry <denton.gentry@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/iface.c b/net/mac80211/iface.c
index 01eede7406a55610e771c7cd906cbedcfff1fa6a..f75e5f132c5ad4a816fc933defedda38f0695e66 100644 (file)
--- a/net/mac80211/iface.c
+++ b/net/mac80211/iface.c
@@ -1175,8 +1175,8 @@ static void ieee80211_iface_work(struct work_struct *work)
                        if (sta) {
                                u16 last_seq;
 
-                               last_seq = le16_to_cpu(
-                                       sta->last_seq_ctrl[rx_agg->tid]);
+                               last_seq = IEEE80211_SEQ_TO_SN(le16_to_cpu(
+                                       sta->last_seq_ctrl[rx_agg->tid]));
 
                                __ieee80211_start_rx_ba_session(sta,
                                                0, 0,