From: Sergey Vlasov <vsu@altlinux.ru>
To: "Paul Rolland" <rol@as2917.net>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [2.4.31] - USB device numbering in /proc/bus/usb
Date: Tue, 23 Aug 2005 19:45:48 +0400 [thread overview]
Message-ID: <20050823194548.6441d995.vsu@altlinux.ru> (raw)
In-Reply-To: <200508231314.j7NDEGD09705@tag.witbe.net>
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On Tue, 23 Aug 2005 15:14:38 +0200 Paul Rolland wrote:
> I've just rebooted a machine, and the eagle ADSL modem I was using,
> presented as /proc/bus/usb/002/005 in now presented as
> /proc/bus/usb/002/003 (same bus, but device ID changed from 5 to 3).
>
> Is this an expected behavior, when running a 2.4.31 kernel ?
Yes. Addresses for USB devices are assigned dynamically. If you
disconnect the modem from USB and connect it again, its address will
change.
> I would have been expecting some more stability in the numbering across
> reboot, the same way IDE disks numbers are stable.
Use some other identifier which is stable - e.g., serial number of the
USB device (unfortunately, many devices don't have it).
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next prev parent reply other threads:[~2005-08-23 15:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-23 13:14 [2.4.31] - USB device numbering in /proc/bus/usb Paul Rolland
2005-08-23 15:45 ` Sergey Vlasov [this message]
2005-08-23 15:51 ` Paul Rolland
2005-08-23 16:31 ` Alistair John Strachan
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