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Re: [PATCH 3.8 1/3] ath9k_hw: fix calibration issues on chainmask that don't include chain 0

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On 2013-03-07 3:31 PM, Wojciech Dubowik wrote:
> There is a regression introduced by this patch when power save is off on
> the station for idle checks.
> I have AR9590 station with rx and tx chain set to 0x1 connected
> to legacy AP (based on Ar9390) with RF cable and 40dB attenuator.
> 
> Before this patch in connection polling the station was properly sending
> null function to check whether AP is still there. After this patch it sends
> broadcast probe request which is anyway wrong or some 16 or so packets
> of random data (rarely). It manifests itself in lost connection because 
> there
> is no ack from AP which is expected for null function.
> 
> I have been following skb's up to the descriptor setting in ath9k and it was
> all ok i.e. proper null function with valid addresses.
> 
> I have been bisecting it twice because it doesn't make much sense but maybe
> it's a HW issue?
You're right, it does not make much sense. I can't figure out how this
patch could possibly change the runtime behavior with tx chainmask set
to 0x1. Have you tried reverting this patch in a current build to see if
that fixes the issue?

- Felix

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