linux-kernel - Re: [RFC]Is usb port number fixed?

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Message-ID: <20120423015212.GA7547@udknight>
Date:	Mon, 23 Apr 2012 09:52:12 +0800
From:	Wang YanQing <udknight@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Anil Nair <anilcoll90@...il.com>, Greg KH <greg@...ah.com>,
	lkml <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org
Subject: Re: [RFC]Is usb port number fixed?

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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