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Re: [PATCH v4] cfg80211: regulatory introduce maximum bandwidth calculation

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On 19 February 2014 19:51, Luis R. Rodriguez <mcgrof@xxxxxxxxxxxxxxxx> wrote:
> On Thu, Jan 30, 2014 at 12:52 AM, Janusz Dziedzic
> <janusz.dziedzic@xxxxxxxxx> wrote:
>>
>> We don't need any changes in CRDA or internal regulatory.
>
> What happens if an old kernel gets a new wireless-regdb with AUTO on
> all of its 5 GHz regdomain for the country it using ? I see no mention
> of this anywhere in the documentation and at least from the code
> review I just did it seemed like we'd use 0. I hope I'm wrong as
> otherwise that'd introduce a severe regression when this is introduced
> to wireless-regdb.

Old wireless-regdb also allow 0 :-) (the same case like last one)

Old-kernel + new wireless-regdb + new crda.
In case of AUTO we will not set NL80211_ATTR_FREQ_RANGE_MAX_BW we will
get -EINVAL

Old-kernel + new wireless-regd + old crda (will send 0):
We will set on channels: IEEE80211_CHAN_NO_HT40 |
IEEE80211_CHAN_NO_HT80 | IEEE80211_CHAN_NO_HT160
So, all channels where BW=0 will be HT20 only - isn't that default?

BR
Janusz
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