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

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Date:	Sat, 21 Apr 2012 13:23:17 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Wang YanQing <udknight@...il.com>
cc:	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 Sat, 21 Apr 2012, Wang YanQing wrote:

> On Fri, Apr 20, 2012 at 08:32:37PM -0400, Alan Stern wrote:
> > In this particular case, it is guaranteed that the left USB port will 
> > always be numbered as X-1.1:1.0 and the right port as X-1.2:1.0, where 
> > the number X may change from one boot to another.  But the -1.1:1.0 and 
> > -1.2:1.0 parts will always be the same.
> > 
> > This is because X is the bus number, which is allowed to change.  The 
> > -1.1:1.0 and -1.2:1.0 values are port, configuration, and interface 
> > numbers.  They will never change, because they come from the hardware.
> Yes, configuration and interface come from the hardware,
> but I don't know where the port come from, at least I don't think the port
> comes from the same hardware with the configuration and interface, do you 
> mean port come from the hub?

Yes, it does.

Alan Stern

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