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Re: [PATCH v5] mac80211: implement multi-vif in-place reservations

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On Wed, 2014-05-07 at 14:20 +0200, Michal Kazior wrote:

> >  1) for_each_vif: switch vif from oldctx to newctx
> >  2) add newctx
> >     for_each_vif: switch vif from oldctx to newctx
> >     del oldctx
> >
> > With the option between 1/2 being selected by the flags. I don't see
> > what the driver has to infer about it being a channel switch - it
> > necessarily is one, no?
> 
> Yeah - existing usecases include only CSA and some primitive ops.
> 
> What I mean is if you want to avoid chanctx overcommit you need to
> perform (2) the other way around (i.e. first unassign and delete
> oldctx and then create newctx), at least internally. This would simply
> be more of a hassle with multiple call transaction API.

Well, sure you really have to do it the other way around - but we'd be
assuming the driver does whatever it can internally, for that call

johannes

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