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Re: [PATCH] mac80211: don't require associated->beacon_ies for ps

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Eliad Peller <eliad@xxxxxxxxxx> writes:

> beacon_ies is needed only in order to extract the dtim
> period. However, even if it's missing we can still enter
> ps with dtim=1 (which also happens if the TIM ie is invalid).
>
> Most drivers don't use conf.max_sleep_period/ps_dtim_period
> anyway, and this check prevents them from entering ps if
> they don't have beacon (but only probe response), even though
> the beacon is not needed at all.

Does this increase the chances of accidentally using dtim 1 even though
AP has dtim > 1? I'm just worried that it's difficult to detect cases
when we are forcing dtim to 1 and nobody might not notice it. How often
will this happen?

Should we add a warning message for that case? Or few years ago we
talked about waiting for a beacon before enabling ps mode, should we
reconsider that? (Or maybe it's implemented already?)

-- 
Kalle Valo
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