Issue with ath9k and tx/rx chainmask: 3x3 doesn't work with mask of 0x1.

[Ben Greear <greearb@candelatech.com>]

I am trying to test out an attenuator.  For now, I have only a single attenuator,
so I set tx and rx chainmask to 0x1 on both AP and Station machine.

I then connected channel 0 on the two machines together through the
attenuator.

I have two station interfaces on the station machine.  They both
seem to associate OK, but they cannot receive dhcp responses.

It *seems* that broadcast packets may go through fine.

If I force the rate down to 1x1 or 2x2 MIMO (or force disable /n
and just use /a), then it appears to work fine.

Nics are WPEA-127n (AR9380).  Kernel is 3.5.1+ on AP, 3.5.2+ on station
machine.

I can see why forcing it down to 1x1 might work around some issue,
but I find it funny that 2x2 works while 3x3 does not.

Thanks,
Ben

-- 
Ben Greear <greearb@candelatech.com>
Candela Technologies Inc  http://www.candelatech.com