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Re: [PATCH] mac80211: Push idle state to driver before stop

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On Thu, 2010-12-16 at 04:46 -0800, Paul Stewart wrote:

> >> I haven't dug deep into it, but I can guess at a reason -- ath9k stores idle
> >> state in two different places -- one is meant to mirror mac80211's state,
> >> and the other one is internal, periodically computed from the state of all
> >> wiphys. The ath9k version of the fix modified the
> >> internal state without the mac80211 mirror.
> >
> > But at this point mac80211 doesn't care what the state is any more.
> 
> Huh?  I'm not sure I understand this statement.  If mac80211 suspends
> and resumes with open_count > 1 (e.g, with an associated STA), I argue
> mac80211 _does_ care what the state is.  In fact, although we called
> stop() on the driver, there's every expectation that on resume any state
> stored on suspend is recovered.  Are you not assuming this?

Not really -- the driver may throw away all internal state, mac80211
will (attempt to) restore it all through drv_config() with changed = ~0.
Evidently ath9k has some magic that makes this fail?

johannes

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