Re: /sbin/hotplug invocation for USB devices in 2.5.40

[Greg KH <greg@kroah.com>]

On Tue, Oct 08, 2002 at 02:00:57PM -0700, David Brownell wrote:
> 
> I think device speed is still unavailable through KFS,

Good catch, I'll go add that.

> and I suspect the extra audio descriptor bytes aren't exposed, but
> other than that the read-only access modes are about equivalent.

That should go into the audio driver, not the usb core.

> But USBFS lets you interact with the device, and every user mode driver
> (or configuration tool) relies on that.  Many of them hook up through
> hotplug.  KFS doesn't; which is why the agents will continue to need
> the USBFS path.

I want to remove the fact that usbfs is being used by the hotplug
scripts.  I don't care about any userspace drivers or configuration
scripts, they can determine the usbfs location from the driverfs/kfs
device already.

> There's also the "coldplug" situation.  KFS _could_ remember which
> devices didn't have hotplug events issued (a device state flag) and
> rescan its tree to issue them, after the kernel's come up enough that
> /sbin/hotplug can safely be called.  Only solving that issue lets us
> completely get rid of "usbmodules".

No, kfs isn't going to do a "coldplug" store and replay thing.
What is going to happen is /sbin/hotplug will be present early in the
boot due to initramfs, so the proper modules will already be loaded.  If
userspace wants to walk the driverfs/kfs tree when init starts up,
that's up to it.

And yes, I really want to get rid of usbmodules too :)

> >Also, any reason to keep the DEVFS variable?  It's wrongly named, and
> >doesn't look like anyone uses it.
> 
> Not any longer.  But update the docs (on the hotplug website).

Will do.

thanks,

greg k-h


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