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Re: [RFC 2/2] cfg80211: check (VHT) bandwidth against regulatory

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On Thu, Dec 6, 2012 at 8:53 AM, Johannes Berg <johannes@xxxxxxxxxxxxxxxx> wrote:
> -       /* TODO: missing regulatory check on 80/160 bandwidth */
> +       /*
> +        * TODO: What if there are only certain 80/160/80+80 MHz channels
> +        *       allowed by the driver, or only certain combinations?
> +        *       For 40 MHz the driver can set the NO_HT40 flags, but for
> +        *       80/160 MHz and in particular 80+80 MHz this isn't really
> +        *       feasible -- should we ask the driver here?
> +        */

It'd be real odd if a card could only do certain settings but at least
from what I was told the spec did limit the required combinations to a
smaller set so technically I could see the firmware having the checks
to only allow those settings. I don't think it makes sense to add this
as a limitation that gets annotated by a flag on the driver though. I
suspect we can assume a driver that supports VHT80 will support those
combos defined on the spec and so will a card that can support VHT160
and the only restriction really should be regulatory.

  Luis
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