On Thu, Jul 23, 2009 at 16:44, Alan Stern<stern@xxxxxxxxxxxxxxxxxxx> wrote: > On Thu, 23 Jul 2009, Andrew Morton wrote: >> On Sat, 18 Jul 2009 22:04:57 +0200 Ferenc Wagner <wferi@xxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
