Re: [PATCH v5 2/4] cfg80211: allow usermode to query wiphy specific regdom

["Luis R. Rodriguez" <mcgrof@suse.com>]

On Fri, Nov 28, 2014 at 02:46:27PM +0100, Johannes Berg wrote:
> On Thu, 2014-11-27 at 09:44 +0200, Arik Nemtsov wrote:
> > If a wiphy-idx is specified, the kernel will return the wiphy specific
> > regdomain, if such exists. Otherwise return the global regdom.
> > 
> > When no wiphy-idx is specified, return the global regdomain as well as
> > all wiphy-specific regulatory domains in the system, via a new nested
> > list of attributes.
> 
> Is that really a good idea? Seems rather easy to overrun the message
> size with that, in which case your current code will not return anything
> at all... that'll cause strange errors if somebody plugs in a few
> devices or has hwsim open as well or so ...

Good point, perhaps require 'iw reg get --all' for all listing then?
This would mean requiring an new optional flag passed on reg get too
then.

> > Add a new attribute for each wiphy-specific regdomain, for usermode to
> > identify it as such.
> 
> Shouldn't userspace also *request* this for backward compatibility?
> Otherwise older userspace might assume that a returned regd applies to
> everything, when it doesn't really?

If the flag --all is used and passed then I see no issue.

  Luis