Re: udev or kernel broken with rsdl 0.30 patch

[Kay Sievers <kay.sievers@vrfy.org>]

On Fri, 2007-03-16 at 13:32 +0100, Andreas Jellinghaus wrote:
> 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.

Yeah, if it's the case, it should be fixed in the kernel, to create the
attributes before the device is announced to userspace.

> 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?

It waits for what you ask it to wait for. This may work:
  SUBSYSTEM="usb", KERNEL="[0-9]*:*", WAIT_FOR_SYSFS="bInterfaceProtocol"

Kay


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