[PATCH] hw_features: provide proper fallback to HT20 by defering channel pair check

Eduardo Abinader eduardoabinader at gmail.com
Mon Apr 3 03:10:11 PDT 2017

Hi Jouni,

Is the patch in or out please?


On 1 April 2017 at 13:49, Eduardo Abinader <eduardoabinader at gmail.com> wrote:
> I got a situation with both cases.
> To support the decision for 1st case, I would say that today hostapd
> also allows such "invalid" configurations and fallsback to ht20.
> On 1 April 2017 at 13:39, Jouni Malinen <j at w1.fi> wrote:
>> On Sat, Apr 01, 2017 at 01:02:11PM +0200, Eduardo Abinader wrote:
>>> As hostapd currently allows some flexibility (fallback to ht20) on
>>> setting channel to channel 20MHz, although ht40+/- has been initially
>>> configured.
>>> This patch just extends such flexibility. That said, ch165 fcc would
>>> be then supported.
>>> Doesn´t that make sense to allow such flexibility?
>> That depends.. If the configuration file is explicitly specifying a
>> HT40+ channel with a given primary and secondary channels and either of
>> those channels is not allowed, that configuration file should be
>> rejected. On the other hand, if the configuration file is not specifying
>> a channel (i.e., using ACS) and indicates HT40+ can be enabled, then it
>> would make sense to allow fallback. I'm not sure which of those cases
>> this patch is trying to address. I know it does address the first one
>> and that's the one I don't think should be applied. If it is also needed
>> for the second case, it would make sense to add it, but I'd like to
>> understand what configuration parameters can hit this case.
>> --
>> Jouni Malinen                                            PGP id EFC895FA

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