* 2.6.31-rc3: replugging USB serial converter uses new device node
@ 2009-07-18 20:04 Ferenc Wagner
2009-07-21 11:38 ` Ferenc Wagner
2009-07-23 8:21 ` Andrew Morton
0 siblings, 2 replies; 8+ messages in thread
From: Ferenc Wagner @ 2009-07-18 20:04 UTC (permalink / raw)
To: linux-kernel; +Cc: alan
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:
==poff==
UEVENT[1247946169.580772] remove /devices/virtual/net/ppp0 (net)
UDEV [1247946169.589775] remove /devices/virtual/net/ppp0 (net)
==unplug==
UEVENT[1247946186.700698] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2/tty/ttyUSB2 (tty)
UEVENT[1247946186.700737] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2 (usb-serial)
UEVENT[1247946186.700749] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
UEVENT[1247946186.700760] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.6 (usb_device)
UEVENT[1247946186.700771] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
UDEV [1247946186.701535] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2/tty/ttyUSB2 (tty)
UDEV [1247946186.705822] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2 (usb-serial)
UDEV [1247946186.711662] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
UDEV [1247946186.715237] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.6 (usb_device)
UDEV [1247946186.718872] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
==replug==
UEVENT[1247946199.654628] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
UDEV [1247946199.660946] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
UEVENT[1247946199.661096] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
UEVENT[1247946199.688206] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3 (usb-serial)
UEVENT[1247946199.688254] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3/tty/ttyUSB3 (tty)
UEVENT[1247946199.688266] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.7 (usb_device)
UDEV [1247946199.710642] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
UDEV [1247946199.713898] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3 (usb-serial)
UDEV [1247946199.729618] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.7 (usb_device)
UDEV [1247946199.739566] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3/tty/ttyUSB3 (tty)
==pon==
UEVENT[1247946268.571857] add /devices/virtual/net/ppp0 (net)
UDEV [1247946268.593127] add /devices/virtual/net/ppp0 (net)
Dmesg is available at http://pastebin.com/d516e3e00.
--
Regards,
Feri.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-18 20:04 2.6.31-rc3: replugging USB serial converter uses new device node Ferenc Wagner
@ 2009-07-21 11:38 ` Ferenc Wagner
2009-07-23 8:21 ` Andrew Morton
1 sibling, 0 replies; 8+ messages in thread
From: Ferenc Wagner @ 2009-07-21 11:38 UTC (permalink / raw)
To: linux-kernel; +Cc: alan
Ferenc Wagner <wferi@niif.hu> writes:
> Since upgrading to 2.6.31-rc3 from 2.6.30, my ttyUSB device number
> keeps increasing on each replug.
I forgot to stress that the number increases if I use the device
before unplug only. Simply yanking/replugging the connector makes the
same device number disappear/reappear. Maybe pppd does something
special, which makes the old device "stick", even though pppd dies at
the end of the session.
--
Feri.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-18 20:04 2.6.31-rc3: replugging USB serial converter uses new device node Ferenc Wagner
2009-07-21 11:38 ` Ferenc Wagner
@ 2009-07-23 8:21 ` Andrew Morton
2009-07-23 10:25 ` Ferenc Wagner
2009-07-23 14:44 ` Alan Stern
1 sibling, 2 replies; 8+ messages in thread
From: Andrew Morton @ 2009-07-23 8:21 UTC (permalink / raw)
To: Ferenc Wagner; +Cc: linux-kernel, alan, linux-usb
(cc linux-usb)
On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@niif.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:
>
> ==poff==
> UEVENT[1247946169.580772] remove /devices/virtual/net/ppp0 (net)
> UDEV [1247946169.589775] remove /devices/virtual/net/ppp0 (net)
> ==unplug==
> UEVENT[1247946186.700698] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2/tty/ttyUSB2 (tty)
> UEVENT[1247946186.700737] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2 (usb-serial)
> UEVENT[1247946186.700749] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
> UEVENT[1247946186.700760] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.6 (usb_device)
> UEVENT[1247946186.700771] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
> UDEV [1247946186.701535] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2/tty/ttyUSB2 (tty)
> UDEV [1247946186.705822] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2 (usb-serial)
> UDEV [1247946186.711662] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
> UDEV [1247946186.715237] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.6 (usb_device)
> UDEV [1247946186.718872] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
> ==replug==
> UEVENT[1247946199.654628] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
> UDEV [1247946199.660946] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
> UEVENT[1247946199.661096] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
> UEVENT[1247946199.688206] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3 (usb-serial)
> UEVENT[1247946199.688254] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3/tty/ttyUSB3 (tty)
> UEVENT[1247946199.688266] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.7 (usb_device)
> UDEV [1247946199.710642] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
> UDEV [1247946199.713898] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3 (usb-serial)
> UDEV [1247946199.729618] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.7 (usb_device)
> UDEV [1247946199.739566] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3/tty/ttyUSB3 (tty)
> ==pon==
> UEVENT[1247946268.571857] add /devices/virtual/net/ppp0 (net)
> UDEV [1247946268.593127] add /devices/virtual/net/ppp0 (net)
>
> Dmesg is available at http://pastebin.com/d516e3e00.
Can anyone say whether this is expected behaviour?
Does it actually cause any observeable problems? I expect things will
get ugly once it runs out of range.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-23 8:21 ` Andrew Morton
@ 2009-07-23 10:25 ` Ferenc Wagner
2009-07-23 14:44 ` Alan Stern
1 sibling, 0 replies; 8+ messages in thread
From: Ferenc Wagner @ 2009-07-23 10:25 UTC (permalink / raw)
To: Andrew Morton; +Cc: linux-kernel, alan, linux-usb
Andrew Morton <akpm@linux-foundation.org> writes:
> On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@niif.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:
>>
>> ==poff==
>> UEVENT[1247946169.580772] remove /devices/virtual/net/ppp0 (net)
>> UDEV [1247946169.589775] remove /devices/virtual/net/ppp0 (net)
>> ==unplug==
>> UEVENT[1247946186.700698] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2/tty/ttyUSB2 (tty)
>> UEVENT[1247946186.700737] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2 (usb-serial)
>> UEVENT[1247946186.700749] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
>> UEVENT[1247946186.700760] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.6 (usb_device)
>> UEVENT[1247946186.700771] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
>> UDEV [1247946186.701535] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2/tty/ttyUSB2 (tty)
>> UDEV [1247946186.705822] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB2 (usb-serial)
>> UDEV [1247946186.711662] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
>> UDEV [1247946186.715237] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.6 (usb_device)
>> UDEV [1247946186.718872] remove /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
>> ==replug==
>> UEVENT[1247946199.654628] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
>> UDEV [1247946199.660946] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1 (usb)
>> UEVENT[1247946199.661096] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
>> UEVENT[1247946199.688206] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3 (usb-serial)
>> UEVENT[1247946199.688254] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3/tty/ttyUSB3 (tty)
>> UEVENT[1247946199.688266] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.7 (usb_device)
>> UDEV [1247946199.710642] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0 (usb)
>> UDEV [1247946199.713898] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3 (usb-serial)
>> UDEV [1247946199.729618] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/usb_device/usbdev3.7 (usb_device)
>> UDEV [1247946199.739566] add /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1:1.0/ttyUSB3/tty/ttyUSB3 (tty)
>> ==pon==
>> UEVENT[1247946268.571857] add /devices/virtual/net/ppp0 (net)
>> UDEV [1247946268.593127] add /devices/virtual/net/ppp0 (net)
>>
>> Dmesg is available at http://pastebin.com/d516e3e00.
>
> Can anyone say whether this is expected behaviour?
> Does it actually cause any observeable problems?
The main problem is that I have to change my ppp config before each
pon. I guess it could be solved by some udev trickery, but didn't
want to go that route before getting sure it's expected behaviour,
which I find improbable as it depends on a pppd run in the middle.
That's also why I didn't report it as an USB problem originally.
--
Thanks,
Feri.
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-23 8:21 ` Andrew Morton
2009-07-23 10:25 ` Ferenc Wagner
@ 2009-07-23 14:44 ` Alan Stern
2009-07-23 15:11 ` Kay Sievers
2009-07-23 17:48 ` Andrew Morton
1 sibling, 2 replies; 8+ messages in thread
From: Alan Stern @ 2009-07-23 14:44 UTC (permalink / raw)
To: Andrew Morton; +Cc: Ferenc Wagner, linux-kernel, alan, linux-usb
On Thu, 23 Jul 2009, Andrew Morton wrote:
> (cc linux-usb)
>
> On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@niif.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
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-23 14:44 ` Alan Stern
@ 2009-07-23 15:11 ` Kay Sievers
2009-07-23 17:48 ` Andrew Morton
1 sibling, 0 replies; 8+ messages in thread
From: Kay Sievers @ 2009-07-23 15:11 UTC (permalink / raw)
To: Alan Stern; +Cc: Andrew Morton, Ferenc Wagner, linux-kernel, alan, linux-usb
On Thu, Jul 23, 2009 at 16:44, Alan Stern<stern@rowland.harvard.edu> wrote:
> On Thu, 23 Jul 2009, Andrew Morton wrote:
>> On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@niif.hu> 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.
>
>> 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.
You might find a symlink for ttyUSB devices to the actual device node,
which does not depend on the kernel name, in:
/dev/serial/
|-- by-id
| `-- usb-067b_2303-if00-port0 -> ../../ttyUSB0
`-- by-path
`-- pci-0000:00:1d.7-usb-0:1.1.3.2:1.0-port0 -> ../../ttyUSB0
> For further discussion, see this thread:
>
> http://marc.info/?t=124828810800002&r=1&w=2
I can't find the original message to reply, but the device node is
always deleted and re-created when the device goes away and comes
back.
Thanks,
Kay
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-23 14:44 ` Alan Stern
2009-07-23 15:11 ` Kay Sievers
@ 2009-07-23 17:48 ` Andrew Morton
2009-07-23 18:21 ` Alan Stern
1 sibling, 1 reply; 8+ messages in thread
From: Andrew Morton @ 2009-07-23 17:48 UTC (permalink / raw)
To: Alan Stern; +Cc: Ferenc Wagner, linux-kernel, alan, linux-usb
On Thu, 23 Jul 2009 10:44:13 -0400 (EDT) Alan Stern <stern@rowland.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@niif.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
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: 2.6.31-rc3: replugging USB serial converter uses new device node
2009-07-23 17:48 ` Andrew Morton
@ 2009-07-23 18:21 ` Alan Stern
0 siblings, 0 replies; 8+ messages in thread
From: Alan Stern @ 2009-07-23 18:21 UTC (permalink / raw)
To: Andrew Morton; +Cc: Ferenc Wagner, linux-kernel, alan, linux-usb
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
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2009-07-23 18:21 UTC | newest]
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2009-07-18 20:04 2.6.31-rc3: replugging USB serial converter uses new device node Ferenc Wagner
2009-07-21 11:38 ` Ferenc Wagner
2009-07-23 8:21 ` Andrew Morton
2009-07-23 10:25 ` Ferenc Wagner
2009-07-23 14:44 ` Alan Stern
2009-07-23 15:11 ` Kay Sievers
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