title: Where is data returned by physical carrier sensing is stored?
body: <p>I want to know where is data returned by physical carrier sensing mechanism is stored.
  after doing research found this.
  In <strong>ath9k/main.c</strong> there is one function called <strong>ath9k_get_survey()</strong> which inter calls <strong>ath_update_survey_stats()</strong> function.
  In <strong>ath_update_survey_stats()</strong> , <strong><em>struct survey_info</em></strong> members are getting initialized.</p>
  
  <p>One of the member is <strong><em>channel_time_busy:</em></strong> amount of time the primary channel was sensed busy.
  I want to confirm if this member holds the channel busy time value returned by physical carrier sensing mechanism.</p>