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Re: [RFC] nl80211: don't require netdev UP for wdev

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On Wed, 2012-05-09 at 12:16 +0200, Michal Kazior wrote:

> > No, that's the special case that doesn't work that way -- monitor mode
> > interfaces are also great for debugging when they're just concurrently
> > running with other interfaces and don't have their own channel setting.
> 
> We can make monitor interface to be a slave to other non-monitor 
> interface by passing an extra parameter in start_monitor(). We could 
> then have such a monitor interface follow channel changes of a given 
> non-monitor interface (or rather it wouldn't be using a channel on it's 
> own).

That's not how it works though, a monitor interface will simply report
all frames mac80211 receives, globally.

> >> But then I'm thinking we shouldn't really be changing interface types
> >> explicitly, since they would be set implicitly by start_ap() and such.
> >> We could then use the NL80211_IFTYPE_UNSPECIFIED when we're not associated.
> >
> >  From some point of view, it should work that way, yes.
> >
> > Given how entrenched interface types are we definitely can't get rid of
> > them though, and they're still needed to do concurrency management etc.
> 
> Well, I don't think we can get completely rid of them, too. Or do you 
> mean something else?

We can't even implicitly change them due to concurrency management etc.

johannes

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