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Re: [PATCH 5/7] mac80211: improve CSA locking

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On Thu, 2014-01-23 at 07:22 +0100, Michal Kazior wrote:
> On 22 January 2014 16:13, Luca Coelho <luca@xxxxxxxxx> wrote:
> > On Wed, 2014-01-22 at 16:10 +0100, Johannes Berg wrote:
> >> On Wed, 2014-01-22 at 14:36 +0200, Luca Coelho wrote:
> >>
> >> > I don't think we should try to merge the channel switches.  We should
> >> > just perform them separately, especially because the exact time of the
> >> > switch will most likely not be the same (since the TBTTs are not in
> >> > sync).
> >>
> >> Do you mean that we shouldn't even have all that new API to switch
> >> multiple interfaces simultaneously?
> >
> > Right, I'm not really sure it's necessary.  PErhaps with non-chanctx we
> > need something like that, but maybe it would still be better not to do
> > this in the nl80211 API, but sync/merge in cfg80211/mac80211?
> 
> I was thinking about it. This should work, mostly, as long as you're
> able to submit CSA requests fast enough and you don't use count 0 or
> 1, in which case it becomes racy.

CSA with count 0 or 1 are really tricky in many respects.  But still I
don't see why it would get racy.  The interfaces will switch
independently, making their own chanctx reservations and so on...

--
Luca.

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