Re: udev or kernel broken with rsdl 0.30 patch

[Andreas Jellinghaus <aj@leogic.com>]

Am Freitag, 16. März 2007 12:34 schrieb Kay Sievers:
> > and debugging shows udev gets the event, but does not emit it,
>
> What shows that?
>
> > i.e. doesn't run my script. in one case it runs my script,
> > in the other case it does not. why?
>
> In both cases in your log, there are no events for the usb-device
> itself: /devices/pci0000:00/0000:00:1d.1/usb2/2-1
> Maybe you missed to copy a few lines?

ok, here are again the criticial lines from syslog messages: with 2.6.20.2:
Mar 15 11:19:06 localhost udevd[2622]: udev_event_run: seq 2869 forked, pid 
[6065], 'add' 'usb', 0 seconds old
Mar 15 11:19:06 localhost udevd-event[6065]: wait_for_sysfs: 
file '/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.5/2-1.5:1.0/bus' 
appeared after 0 loops
Mar 15 11:19:06 localhost udevd-event[6065]: 
run_program: '/lib/udev/openct_usb'
Mar 15 11:19:07 localhost udevd-event[6065]: 
run_program: '/lib/udev/openct_usb' returned with status 0
Mar 15 11:19:07 localhost udevd-event[6065]: pass_env_to_socket: passed 338 
bytes to socket '/org/freedesktop/hal/udev_event', 
Mar 15 11:19:07 localhost udevd-event[6065]: run_program: '/sbin/modprobe -Q 
usb:v08E6p3438d0100dc00dsc00dp00ic0Bisc00ip00'
Mar 15 11:19:07 localhost udevd-event[6065]: run_program: '/sbin/modprobe' 
returned with status 1
Mar 15 11:19:07 localhost udevd-event[6065]: pass_env_to_socket: passed -1 
bytes to socket '/org/kernel/udev/monitor', 
Mar 15 11:19:07 localhost udevd-event[6065]: udev_event_run: seq 2869 finished
Mar 15 11:19:07 localhost udevd[2622]: udev_done: seq 2869, pid [6065] exit 
with 1, 1 seconds old

and if I add rsdl:
Mar 15 11:24:32 localhost udevd[2607]: udev_event_run: seq 2717 forked, pid 
[5284], 'add' 'usb', 0 seconds old
Mar 15 11:24:32 localhost udevd-event[5284]: wait_for_sysfs: 
file '/sys/devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.5/2-1.5:1.0/bus' 
appeared after 0 loops
Mar 15 11:24:32 localhost udevd-event[5284]: pass_env_to_socket: passed 338 
bytes to socket '/org/freedesktop/hal/udev_event', 
Mar 15 11:24:32 localhost udevd-event[5284]: run_program: '/sbin/modprobe -Q 
usb:v08E6p3438d0100dc00dsc00dp00ic0Bisc00ip00'
Mar 15 11:24:32 localhost udevd-event[5284]: run_program: '/sbin/modprobe' 
returned with status 1
Mar 15 11:24:32 localhost udevd-event[5284]: pass_env_to_socket: passed -1 
bytes to socket '/org/kernel/udev/monitor', 
Mar 15 11:24:32 localhost udevd-event[5284]: udev_event_run: seq 2717 finished
Mar 15 11:24:32 localhost udevd[2607]: udev_done: seq 2717, pid [5284] exit 
with 1, 0 seconds old

same  hardware, same config, same kernel (except for rsdl patch), and suddenly
it does not spawn openct. why? how can I debug this? if I strace, it works 
fine again, so that didn't help.

> Oh, can you please talk about kernel versions, and not distro nicknames?
> I have no clue what they mean.

ok, sorry. lets skip the question why I don't get events for /dev any more.

> Right, that never worked. The usb-interfaces are childs of the
> usb-device in /sys/devices. The usb_device class-devices (the ones with
> the /dev/bus node) are also just childs of the usb-device and therefore
> can't access the (sibling) interface devices.
>
> With the current usb driver core, you can't match the /dev device-node
> to interfaces, only to the device.
>
> There is a patch pending (now that the new driver core allows us to do
> that), that moves the device-node directly to the /sys/devices
> usb-device, which should solve all the issues in the future.

ok. so until that patch is in the kernel (or udev? or both?), /dev/bus/usb
will not work for udev users as /proc/bus/usb replacement, since the
rules to match the attributes of the usb device won't work. right?

is there some page documenting the compatiblity issues with udev
and the kernel? this might be interesting for other people as well.

Thanks for your help.

Regards, Andreas

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