Re: udev or kernel broken with rsdl 0.30 patch

[Andreas Jellinghaus <aj@leogic.com>]

Am Freitag, 16. März 2007 13:08 schrieb Kay Sievers:
> If you run:
>   udevtest /devices/pci0000:00/0000:00:1d.1/usb2/2-1/2-1.5/2-1.5:1.0
> it works, right?

yes, I booted both kernels once more and tested this, and the output is 
exactly the same, and it runs openct_usb in both cases.

> It that works, it seems the sysfs files are not created at the time you
> want to read them, and the attribute creation time needs to be fixed in
> the kernel.

ok. that seems likely, with rsdl the kernel has different timings and that 
seems to trigger the problem.

what exactly is "wait_for_sysfs"? I'm asking because it shows up in the udevd
log right before openct is started / should be started. I thought it would 
take care of problems like this? or does it only check the basedir, and not
the subdirs / files in the dirs to be present or something like that?


> > ok. so until that patch is in the kernel (or udev? or both?),
>
> A patch to the kernel, and a rule to udev, to create the nodes
> in /dev/bus/usb, from the event of the real usb-device in /sys/devices
> instead of the current class device.
>
> > /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?
>
> That works fine, to match device properties. but not to match interface
> properties of that device. It only works with HAL, because it has a
> weird hack to look at the sibling device.
>
> > is there some page documenting the compatiblity issues with udev
> > and the kernel? this might be interesting for other people as well.
>
> As usual, unfortunately no there is not documentation besides what the
> distros are doing with it.

the kernel has the requirement document which documents which version
of udev is needed. it could be a good start to put this as list on the net / 
which kernel needs which minimum udev.

I ran into udev/kernel incompatibilities at least once (but my fault, didn't
check that document properly).

Thanks,

Andreas

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