On Tue, 2014-11-25 at 19:00 +0800, YanBo wrote: > On Tue, Nov 25, 2014 at 6:23 PM, Johannes Berg > <johannes@xxxxxxxxxxxxxxxx> wrote: > > From: Johannes Berg <johannes.berg@xxxxxxxxx> > > > > If there are no channels allowing 80 MHz to be used, then the > > station isn't really VHT capable even if the driver and device > > support it in general. In this case, exclude the VHT capability > > IE from probe request frames. > > > > FYI, there are some new devices could support the VHT even at 20Mhz > band 2.4G mode. So in 2.4 GHz we typically don't have VHT anyway - and realistically you can't support real "VHT" there, you can only support the new modulations. I think this will require some custom (vendor-specific) advertisement though, since VHT advertisement implies 80 MHz support. IOW, I think at this point this patch isn't a problem. If we really need to support VHT modulations in 2.4 GHz (or even have devices that have VHT modulation support, but no 80 MHz support in 5 GHz) then some new advertisement will have to be done. OTOH, you could argue for that advertisement that on 2.4 GHz you can never do 80 MHz anyway - but can't you? In theory there's enough spectrum for exactly one 80 MHz channel ... johannes -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
