Re: usbcore vs. udev

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

On Tue, 2005-01-25 at 23:12 -0500, Bill Nottingham wrote:
> Greg KH (greg@kroah.com) said: 
> > > modprobe usbcore yields no events to udev, as far as I can tell
> > > by putting a catchall script in /etc/dev.d/default.
> > 
> > Nor should it.  Why would you think it should?
> 
> Only because it emitted events on remove. :)

I can't reproduce this here. I expect, with 050 you don't get any event
in dev.d/, not for "remove" nor for the "add" event of usbcore.
The events for class creation are just recently introduced by a change
in the driver core and I blacklisted these for udev with version 049.

> > Ah, you mean the class add and remove.  Hm, I think we don't emit those
> > because those are classes (not class_dev), and at remove time we don't
> > know to not emit them.  I'm considering always emiting them at add also,
> > but it might mess up some userspace stuff, so I'm trying to be cautious
> > and test it out a lot first.
> > 
> > But again, udev doesn't care about these events, nor should it.
> 
> Probably not. Perhaps hooking into hotplug for the class is better;
> what I was originally looking at is hooking into the class/device
> plug for the mounting of usbfs.

Yes, hotplug.d/ should work fine for this. With the hotplug events
managed by udevd (Fedora devel already swiched to it) the only
difference between hotplug.d/ and dev.d/ is that /dev.d fires only on
node creation/removal. Everything else, the environment, the
availability of the node or wait_for_sysfs is exactly the same.

Thanks,
Kay



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