Back port "scan_freq" implementation to wpa supplicant 0.6.x

[Dan Williams]

On Wed, 2010-12-15 at 22:23 +0100, Johannes Berg wrote:
> On Wed, 2010-12-15 at 15:12 -0600, alfred steele wrote:
> 
> > Thanks. I am trying to gather a better understanding for the
> > difference between mac80211 and the WEXT layers.  I was told that
> > there is a way to adapt a non mac80211 driver(WEXT baseed) to work
> > with mac80211.
> 
> Well, it depends. If it's a softmac driver, then in the long term, and
> particularly if you plan to upstream it, you will want/need to port it
> to use mac80211. If it's a fullmac driver, then you'll want to make it
> register with cfg80211 directly.

I thought that too, then I checked :)  WEXT has the facility to scan for
specific channels, but no in-kernel drivers implement that
functionality.  Of course, since it's channels and not band/freq pairs
it's completely broken too.

Dan