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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Fri, 1 Mar 2019 14:42:56 +0100
   3 Subject: [PATCH] mac80211: do not call driver wake_tx_queue op during reconfig
   4
   5 There are several scenarios in which mac80211 can call drv_wake_tx_queue
   6 after ieee80211_restart_hw has been called and has not yet completed.
   7 Driver private structs are considered uninitialized until mac80211 has
   8 uploaded the vifs, stations and keys again, so using private tx queue
   9 data during that time is not safe.
  10
  11 The driver can also not rely on drv_reconfig_complete to figure out when
  12 it is safe to accept drv_wake_tx_queue calls again, because it is only
  13 called after all tx queues are woken again.
  14
  15 To fix this, bail out early in drv_wake_tx_queue if local->in_reconfig
  16 is set.
  17
  18 Cc: stable@vger.kernel.org
  19 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  20 ---
  21
  22 --- a/net/mac80211/driver-ops.h
  23 +++ b/net/mac80211/driver-ops.h
  24 @@ -1166,6 +1166,9 @@ static inline void drv_wake_tx_queue(str
  25  {
  26         struct ieee80211_sub_if_data *sdata = vif_to_sdata(txq->txq.vif);
  27
  28 +       if (local->in_reconfig)
  29 +               return;
  30 +
  31         if (!check_sdata_in_driver(sdata))
  32                 return;
  33