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[RFC] minstrel_ht should not override user supplied rts

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Hi,

I recently noticed that mac80211 ignores my "iw phy0 set rts" setting. It took
me a while to find the culprit - minstrel_ht enables rts/cts by setting
the IEEE80211_TX_RC_USE_RTS_CTS flag in minstrel_ht_set_rate() regardless of 
the rts threshold configured on the commandline. Since I did not find any
explanation why minstrel_ht does what it does I hereby propose a patch to
make minstrel_ht respect the user supplied setting. You will notice the
minstrel_ht_set_rate() function now never is called with rtscts = true. A
future patch will remove this parameter entirely.

Regards,
Marek

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