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From: Adrian Chadd <adrian@FreeBSD.org>
Date: Mon, 30 May 2011 15:06:57 +0000 (UTC)
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Subject: cvs commit: src/sys/dev/ath if_ath_tx_ht.c
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adrian      2011-05-30 15:06:57 UTC

  FreeBSD src repository

  Modified files:
    sys/dev/ath          if_ath_tx_ht.c 
  Log:
  SVN rev 222498 on 2011-05-30 15:06:57Z by adrian
  
  Enable setting the short-GI bit when TX'ing HT rates but only if the
  hardware supports it.
  
  Since ni->ni_htcap in hostap mode is what the remote end has advertised,
  not what has been negotiated/decided, we need to check ourselves what
  the current channel width is and what the hardware supports before
  enabling short-GI.
  
  It's important that short-GI isn't enabled when it isn't negotiated
  and when the hardware doesn't support it (ie, short-gi for 20mhz channels
  on any chip < AR9287.)
  
  I've quickly verified this on the AR9285 in 11n mode.
  
  Revision  Changes    Path
  1.16      +14 -6     src/sys/dev/ath/if_ath_tx_ht.c