Re: How is /dev/bus/usb created - /dev/bus/usb lost during system

["Petr Kubánek" <petr@kubanek.net>]

Hi,

no custom kernel - 2.6.26-18-server #59

What I found different running

udevadm test /bus/usb/devices/1-0:1.0

on watcher:

udevadm_test: UDEV_LOG=6
udevadm_test: DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-0:1.0
udevadm_test: DEVTYPE=usb_interface
udevadm_test: DRIVER=hub
udevadm_test: DEVICE=/proc/bus/usb/001/001
udevadm_test: PRODUCT\x1d6b/2/206
udevadm_test: TYPE=9/0/0
udevadm_test: INTERFACE=9/0/0
udevadm_test: MODALIAS=usb:v1D6Bp0002d0206dc09dsc00dp00ic09isc00ip00
udevadm_test: ACTION­d
udevadm_test: SUBSYSTEM=usb
udevadm_test: run: 'socket:@/org/freedesktop/hal/udev_event'


on my laptop, running 2.6.31:

udevadm_test: UDEV_LOG=6
udevadm_test: DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-0:1.0
udevadm_test: DEVTYPE=usb_interface
udevadm_test: DRIVER=hub
udevadm_test: PRODUCT\x1d6b/2/206
udevadm_test: TYPE=9/0/0
udevadm_test: INTERFACE=9/0/0
udevadm_test: MODALIAS=usb:v1D6Bp0002d0206dc09dsc00dp00ic09isc00ip00
udevadm_test: ACTION­d
udevadm_test: SUBSYSTEM=usb
udevadm_test: run: 'socket:@/org/freedesktop/hal/udev_event'


e.g. DEVICE is missing. /proc/bus/usb is empty on Watcher and missing on
my laptop (where lsusb works). Any ideas? I
checked /boot/config-2.6.28-18-server, and it does not have
SYSFS_DEPRECATED set.

Petr

Martin Pitt píše v Čt 18. 03. 2010 v 09:51 +0100:
> Hello Petr,
> 
> Petr Kubánek [2010-03-18  2:24 +0100]:
> > I lost /dev/bus/usb during remote system upgrade (Ubuntu 9.04 -> 9.10)
> > on Watcher telescope control computer (@Boyden observatory, South
> > Africa).
> > 
> > I do not see /dev/bus/usb, and lsusb does not show anything. It worked
> > before, USB devices are present in dmesg, so I think USB subsystem is
> > working properly.
> > 
> > To debug this it will help me to know how udev creates and
> > populates /dev/bus/usb - which rule(s) does this, how to debug what
> > might be wrong.
> 
> Those are just created by udev, there is no particular rule for it
> (it's using the kernel default name).
> 
> $ udevadm test /bus/usb/devices/1-8
> [...]
> udev_rules_apply_to_event: LINK 'char/189:2' /lib/udev/rules.d/50-udev-default.rules:4
> udev_rules_apply_to_event: MODE 0664 /lib/udev/rules.d/50-udev-default.rules:62
> udev_rules_apply_to_event: RUN 'socket:@/org/freedesktop/hal/udev_event' /lib/udev/rules.d/90-hal.rules:2
> udev_event_execute_rules: no node name set, will use kernel supplied name 'bus/usb/001/003'
> [...]
> udevadm_test: DEVPATH=/devices/pci0000:00/0000:00:1d.7/usb1/1-8
> udevadm_test: DEVNAME=/dev/bus/usb/001/003
> [...]
> 
> My best guess is that you are running a custom kernel which perhaps
> has CONFIG_SYSFS_DEPRECATED_V2 set, or something similar? What does
> "uname -a" say?
> 
> Martin
>