1. 16 12月, 2013 2 次提交
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      mac80211: add pre-RCU-sync sta removal driver operation · 6a9d1b91
      Johannes Berg 提交于
      Currently, mac80211 allows drivers to keep RCU-protected station
      references that are cleared when the station is removed from the
      driver and consequently needs to synchronize twice, once before
      removing the station from the driver (so it can guarantee that
      the station is no longer used in TX towards the driver) and once
      after the station is removed from the driver.
      
      Add a new pre-RCU-synchronisation station removal operation to
      the API to allow drivers to clear/invalidate their RCU-protected
      station pointers before the RCU synchronisation.
      
      This will allow removing the second synchronisation by changing
      the driver API so that the driver may no longer assume a valid
      RCU-protected pointer after sta_remove/sta_state returns.
      
      The alternative to this would be to synchronize_rcu() in all the
      drivers that currently rely on this behaviour (only iwlmvm) but
      that would defeat the purpose.
      Signed-off-by: NJohannes Berg <johannes.berg@intel.com>
      6a9d1b91
    • J
  2. 11 12月, 2013 11 次提交
  3. 10 12月, 2013 27 次提交