Messages in this thread | | | Date | Mon, 23 Apr 2012 09:52:12 +0800 | From | Wang YanQing <> | Subject | Re: [RFC]Is usb port number fixed? |
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On Sun, Apr 22, 2012 at 08:47:24AM -0400, Alan Stern wrote: > On Sun, 22 Apr 2012, Anil Nair wrote: > > > The port number comes from root hub managed by the host controller. Its > > fixed dynamically during enumeration, and can change. > > Please correct me if i am wrong. > > You are indeed wrong. Port numbers are not fixed dynamically and they > cannot change. Right? Could you pin out the codes in kernel? > > On the other hand, bus numbers _are_ assigned dynamically and they can > (and do) change. > Indeed, I never meat the situation lspci output different bus number on the same machine. Any more comment?
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