Re: Force use of 5GHz band

[Denis Kenzior <denkenz@gmail.com>]

Hi James,

> 
> How would you prefer I do this? We've got quite a few modules using scan APIs so 
> I question if we want to filter the frequencies before calling scan_*

We should be doing that already, no?  Any code that specifies scan frequencies 
in some way should be aware of wiphy band capability and regdom.

> 
> If we filter in scan.c and call back as if the scan returned no results we 
> shouldn't need to touch anything except scan.c. The downside is its a bit of 

I really rather not generate dummy/bogus callbacks.  That just pollutes debug 
logs and makes the code hard to follow.  Station would be most affected here 
since it breaks up the 2.4Ghz band scan quite a bit.

If 2.4 is turned off, it should just skip those requests entirely.

> wasted work doing this since we have to create requests and work items for 
> nothing, but the alternative of adding this specific logic to each module using 
> scan calls seems worse IMO, what do you think?
> 

One thing to keep in mind is that some devices operate only on 2.4G.  For 
example WSC/WPS might only perform push button operations on 2.4 GHz band and 
not 5G.  Might be similar with DPP?  So for compatibility reasons maybe this 
should be a station-only feature?

Regards,
-Denis