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

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Date:	Thu, 23 Jul 2009 14:21:39 -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:

> > > > 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.
> 
> But this is new behaviour in 2.6.31-rcX.  Was something changed in this area?

The tty core and usb-serial have both undergone extensive changes, 
courtesy of Alan Cox.

Alan Stern

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