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

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Message-Id: <20090723104809.6d39b03b.akpm@linux-foundation.org>
Date:	Thu, 23 Jul 2009 10:48:09 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Alan Stern <stern@...land.harvard.edu>
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 10:44:13 -0400 (EDT) Alan Stern <stern@...land.harvard.edu> wrote:

> 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.

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

> > 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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