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

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Message-ID: <20120420093738.GA12755@udknight>
Date:	Fri, 20 Apr 2012 17:37:38 +0800
From:	Wang YanQing <udknight@...il.com>
To:	lkml <linux-kernel@...r.kernel.org>, linux-usb@...r.kernel.org
Subject: Re: [RFC]Is usb port number fixed?

On Fri, Apr 20, 2012 at 05:25:25PM +0800, Wang YanQing wrote:
> Hi!
> when I execute the command below:
> 
> "ls /sys/bus/usb/devices/"
> 
> I get:
> "1-0:1.0 1-1 1-1:1.0 2-0:1.0 2-1 2-1.1 2-1:1.0 2-1.1:1.0 2-1.5 2-1.5:1.0 2-1.5:1.1  usb1  usb2"
> 
> the output format is bus-port.port:config.interface
> I want to know whether the port number is fixed after I reboot machine time by time.
> And if it is fixed, then what make it.
> 
> Thanks!

Make the question precise.
I assme there are two usb ports in my notebook at left and right separately.
When I plug mouse into 
left usb port, I get 2-1.1:1.0
right usb port, I get 2-1.2:1.0

I want to know whether it is right that no matter how many times I reboot the machine,
the test result above will be the same.And if it will be the same, then why it will be the same.

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