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

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Message-ID: <Pine.LNX.4.44L0.0907231042040.2825-100000@iolanthe.rowland.org>
Date:	Thu, 23 Jul 2009 10:44:13 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Ferenc Wagner <wferi@...f.hu>, <linux-kernel@...r.kernel.org>,
	<alan@...rguk.ukuu.org.uk>, <linux-usb@...r.kernel.org>
Subject: Re: 2.6.31-rc3: replugging USB serial converter uses new device node

On Thu, 23 Jul 2009, Andrew Morton wrote:

> (cc linux-usb)
> 
> On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@...f.hu> 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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