Re: 2.6.31-rc3: replugging USB serial converter uses new device node

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On Thu, 23 Jul 2009, Sid Boyce wrote:

> Andrew Morton wrote:
> > (cc linux-usb)
> > 
> > On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@xxxxxxx> wrote:
> > 
> >> Hi,
> >>
> >> Since upgrading to 2.6.31-rc3 from 2.6.30, my ttyUSB device number
> >> keeps increasing on each replug.  Output of udevadm monitor:

> The problem may go beyond usb devices as I have had to edit out excess
> CD/DVD devices in /etc/udev/rules.d/70-persistent-cd.rules.
> 1. Original DVD failed.
> 2. Used a USB attached DVD.
> 3. Installed a new DVD.
> The result was that the last device /dev/cdrom3, /dev/dvd3, etc. were
> the current device nodes.
> A udev problem perhaps?

No, this is expected behavior.  Lots of subsystems do this; you can see 
the same sort of thing with SCSI disks, for example.  Or USB device 
numbers.

Alan Stern

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