hi , 
  I read the code all along today. I just know hostAP control nl80211
which is upper the cfg80211 and mac80211.
  And then I read mac80211, but all functions are provided to be used by
upper layer. There is something confusing me.
  Like that ieee80211_beacon_get_tim(), it is a generating beacon
function. But it only responses for generating a template of Beacon
frame, where its beacon timer to be set?
  I found it is called in ath9k/beacon.c   , it surprise me a lot,
because i always believe mac80211 is the upper layer than those drivers
like ath9k.
  What I believe, 
  |-----------------------------------------------|
  |                   hostAP                      |
  |-----------------------------------------------|
  |                 nl80211                       |
  |-----------------------------------------------|
  |                  cfg80211 or wext             |
  |-----------------------------------------------|
  |                  mac80211                     |
  |---------------|------------------|------------|
  |  ath9k driver |   ath5k driver   |  others    |
  |---------------|------------------|------------|

  But why ath9k/beacon.c will call these interface provided by mac80211?
  is this architecture right?


  Yunong Pang
  Regards,

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