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

[Alan Stern]

On Thu, 23 Jul 2009, 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:
...
> > Dmesg is available at http://pastebin.com/d516e3e00.
> 
> Can anyone say whether this is expected behaviour?

It depends on whether a program is still holding the old device file 
open when the replug occurs.

> Does it actually cause any observeable problems?  I expect things will
> get ugly once it runs out of range.

The numbers will get reused after the corresponding device files are
closed.

For further discussion, see this thread:

	http://marc.info/?t=124828810800002&r=1&w=2

Alan Stern

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