RE: [PATCH 06/10] cfg80211: honor NL80211_RRF_NO_HT40{MINUS,PLUS}

[Grumbach, Emmanuel]

> 
> On Tue, 2017-09-05 at 16:49 +0000, Grumbach, Emmanuel wrote:
> > On Tue, 2017-09-05 at 16:30 +0200, Johannes Berg wrote:
> > > On Sat, 2017-08-05 at 11:44 +0300, Luca Coelho wrote:
> > >
> > > > +       regd = get_wiphy_regdom(wiphy);
> > > > +       if (regd) {
> > > > +               const struct ieee80211_reg_rule *reg_rule =
> > > > +                       freq_reg_info_regd(MHZ_TO_KHZ(channel-
> > > > > center_freq),
> > > >
> > > > +                                          regd,
> > > > MHZ_TO_KHZ(20));
> > > >
> > >
> > > This could return an error, how can you be sure it doesn't?
> > >
> >
> > Hm... so I guess I could check that it didn't return any error and if
> > it did, then flags = 0?
> >
> > Something like this? (on top of this patch):
> > [snip]
> 
> yeah that's obviously the easy thing to do - I just wasn't sure that you 
> didn't
> have a reason to believe it could never be an ERR_PTR :)
>
TBH, I don't really know... I don't know if *all* the channels are covered by 
rules.
For sure, if there is no rule, I can assume that the HT40{+,-} are not set... 
But I don't know if that's even possible.