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

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Message-ID: <Pine.LNX.4.44L0.1204220846290.15283-100000@netrider.rowland.org>
Date:	Sun, 22 Apr 2012 08:47:24 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Anil Nair <anilcoll90@...il.com>
cc:	Wang YanQing <Udknight@...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, 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.

On the other hand, bus numbers _are_ assigned dynamically and they can 
(and do) change.

Alan Stern

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