From: Wang YanQing <udknight@gmail.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Anil Nair <anilcoll90@gmail.com>, Greg KH <greg@kroah.com>,
lkml <linux-kernel@vger.kernel.org>,
linux-usb@vger.kernel.org
Subject: Re: [RFC]Is usb port number fixed?
Date: Mon, 23 Apr 2012 09:52:12 +0800 [thread overview]
Message-ID: <20120423015212.GA7547@udknight> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1204220846290.15283-100000@netrider.rowland.org>
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?
next prev parent reply other threads:[~2012-04-23 1:52 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CAHkwNT=DTjdhZmEg+SFGOVi+ZcS-NpHWH8Hh3XV+-BPzHRC7NA@mail.gmail.com>
2012-04-22 12:47 ` [RFC]Is usb port number fixed? Alan Stern
2012-04-23 1:52 ` Wang YanQing [this message]
2012-04-23 15:13 ` Alan Stern
2012-04-24 2:16 ` Wang YanQing
2012-04-24 14:14 ` Alan Stern
2012-04-24 15:58 ` Wang YanQing
2012-04-24 14:22 ` anil
2012-04-24 2:24 ` Wang YanQing
2012-04-20 9:25 Wang YanQing
2012-04-20 9:37 ` Wang YanQing
2012-04-20 15:37 ` Greg KH
[not found] ` <CAHkwNT=VW8qF-7QRxpiaWkmQm0UFdsbahFLhT-PCc4OMnVs1Gg@mail.gmail.com>
2012-04-20 16:19 ` Greg KH
2012-04-21 0:32 ` Alan Stern
2012-04-21 5:56 ` Wang YanQing
2012-04-21 17:23 ` Alan Stern
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