[FS#776] ath9k wds mode station break off

[LEDE Bugs]

The following task has a new comment added:

FS#776 - ath9k wds mode station break off
User who did this - jianxi sun (ycsunjane)

----------
Add some debug info in mac80211, i can get data packet in
__ieee80211_rx_handle_packet

4053         if (ieee80211_is_mgmt(fc)) {
4054                 mac80211_dbg(local, RX, "mac80211 mgmt
packet\n");
4055                 /* drop frame if too short for header */

4083         } else if (ieee80211_is_data(fc)) {
4084                 mac80211_dbg(local, RX, "mac80211 data
packet\n");
4085                 struct sta_info *sta, *prev_sta;

with ping packet log:

[ 8996.617367] mac80211 data packet
[ 8996.622783] mac80211 mgmt packet
[ 8996.725036] mac80211 mgmt packet
[ 8996.820829] mac80211 data packet
[ 8996.829383] mac80211 mgmt packet
[ 8996.931682] mac80211 mgmt packet
[ 8997.033052] mac80211 mgmt packet
[ 8997.135956] mac80211 mgmt packet


And station will deauth from ap with PRE_AUTH_NOT_VALID:

[ 8998.621385] wlan0: deauthenticated from c8:ee:a6:2d:cc:6c (Reason:
2=PREV_AUTH_NOT_VALID)
[ 8998.629537] br-lan: port 2(wlan0) entered disabled state
[ 9003.635631] wlan0: authenticate with c8:ee:a6:2d:cc:6c
[ 9003.651230] wlan0: send auth to c8:ee:a6:2d:cc:6c (try 1/3)
[ 9003.670365] wlan0: associate with c8:ee:a6:2d:cc:6c (try 1/3)
[ 9003.681735] wlan0: RX AssocResp from c8:ee:a6:2d:cc:6c (capab=0x431
status=0 aid=1)
[ 9003.815829] br-lan: port 2(wlan0) entered forwarding state


I think some bug in auth cause data packet drop.
----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=776#comment2838