From c7dcb45facedbff84237adb77bd3ba50f75c0de4 Mon Sep 17 00:00:00 2001
From: Denton Gentry <denton.gentry@gmail.com>
Date: Mon, 28 Jul 2014 23:36:32 -0700
Subject: [PATCH] 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>
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