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From: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>
Date: Fri, 21 Feb 2014 15:08:27 -0800
Message-ID: <CAB=NE6Xr=SK3rdpS2SoE-k94EhLkdFsLPCtEjk95o8KSjYoMkg@mail.gmail.com> (sfid-20140222_000857_485836_BB9F2D76)
Subject: Re: [PATCH v4] cfg80211: regulatory introduce maximum bandwidth calculation
To: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Cc: Johannes Berg <johannes@sipsolutions.net>,
	linux-wireless <linux-wireless@vger.kernel.org>
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Sender: linux-wireless-owner@vger.kernel.org

On Wed, Feb 19, 2014 at 11:25 PM, Janusz Dziedzic
<janusz.dziedzic@tieto.com> wrote:
> On 20 February 2014 08:08, Johannes Berg <johannes@sipsolutions.net> wrote:
>> On Thu, 2014-02-20 at 07:07 +0100, Janusz Dziedzic wrote:
>>
>>> > 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-kernel + new wireless-regdb + new crda.
>>> In case of AUTO we will not set NL80211_ATTR_FREQ_RANGE_MAX_BW we will
>>> get -EINVAL
>>
>> That seems like a problem.
>>
> So, we can always add NL80211_ATTR_FREQ_RANGE_MAX_BW set as 0 in crda.
> Then all channels where BW=0 will be HT20 only for old kernel.

That also seems like a problem.

  Luis