On Thu, Jul 09, 2020 at 05:09:59PM +0200, Pali Rohár wrote: [...] > > I understand that but the bridge bus resource can be trimmed to just > > contain the root bus because that's the only one where there is a > > chance you can enumerate a device. > > It is possible to register only root bridge without endpoint? It is possible to register the root bridge with a trimmed IORESOURCE_BUS so that you don't enumerate anything other than the root port. > > I would like to get Bjorn's opinion on this, I don't like these "link is > > up" checks in config accessors (they are racy and honestly it is a > > run-time check that does not make much sense, either it is always > > true/false or it is inevitably racy) > > It is runtime check, but does not have to be always true/false. I have > tested more Compex wifi cards and under certain conditions they > "disappear" from the bus during usage. I would be very grateful if you could describe what happens in HW when these conditions trigger - I would like to understand if this issue is aardvark specific or it isn't. > So I think it still make sense to do this "fast" check as it is only > optimization. I will merge this patch but I'd also like to understand the underlying issue better. Thanks, Lorenzo
