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mac80211: changing number of queues in ops->start

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I'm wondering how to implement QoS capability runtime detection
in a mac80211 driver.

In b43 we don't know at ieee80211_register time whether the firmware does
support QoS or not, because it's not loaded yet. (Reasons for not loading
it that early are issues with builtin-b43, etc...).
So we don't know whether we are going to load opensource fw (no QoS) or
proprietary fw (QoS capable).
But it seems that mac80211 requires to set hw->queues before ieee80211_register.

So what I'd need is a way to change the number of possible queues from within
the ops->start handler.

Any ideas?

-- 
Greetings, Michael.
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