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/freebsd-9.3-release/sys/dev/ath/
H A Dif_ath_tx.cdiff 218932 Mon Feb 21 22:39:16 MST 2011 adrian Shuffle around the RTS/CTS rate/duration logic.

* Turn ath_tx_calc_ctsduration() into a function that
returns the ctsduration, or -1 for HT rates;
* add a printf() to ath_tx_calc_ctsduration() which will be
very loud if somehow that function is called with an MCS
rate;
* Add ath_tx_get_rtscts_rate() which returns the RTS/CTS
rate to use for the given data rate, incl. the short
preamble flag;
* Only call ath_tx_calc_ctsduration() for non-11n chipsets;
11n chipsets don't require the rtscts duration to be
calculated.

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