linux-kernel - Re: can we move USB_DEVICEFS to non-embedded?

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Message-ID: <20090708145625.GA20690@suse.de>
Date:	Wed, 8 Jul 2009 07:56:25 -0700
From:	Greg KH <gregkh@...e.de>
To:	Peter Jones <pjones@...hat.com>
Cc:	Dave Airlie <airlied@...il.com>,
	Jeff Chua <jeff.chua.linux@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Scott James Remnant <scott@...onical.com>,
	Kay Sievers <kay.sievers@...y.org>,
	Dave Jones <davej@...hat.com>
Subject: Re: can we move USB_DEVICEFS to non-embedded?

On Wed, Jul 08, 2009 at 10:12:08AM -0400, Peter Jones wrote:
> Greg KH wrote:
> > On Wed, Jul 08, 2009 at 09:55:04AM -0400, Peter Jones wrote:
> >> On 07/08/2009 09:52 AM, Peter Jones wrote:
> >>> On 07/08/2009 06:54 AM, Dave Airlie wrote:
> >>>
> >>>> I'm not quite sure if something in the F11 initrd needs usbfs for
> >>>> something (cc'ed Peter)
> >>> Not a thing.
> >> Actually, I take it back.  We do mount usbfs, and we examine
> >> /proc/bus/usb/devices as a heuristic to try and determine if
> >> all the devices have been enumerated.
> > 
> > How can you ever know if all devices are enumerated as you don't know
> > how many devices will be showing up?
> 
> You don't, that's why I said it's a heuristic.  But basically, we have a 
> timeout, and if the device list doesn't change in that amount of time, we
> call it done.
> 
> It's not the best technique ever, but it does work.

Works for what?  Why would you want to delay your boot process like
this?

> >> So that could be related to what you're seeing.
> > 
> > That file is now available in /sys/kernel/debug/usb/devices if you
> > really need it.
> 
> Oh, okay.  I can change it to use that then.
> 
> > But I would think that you do not.
> 
> Well, we pretty much do until we switch to dracut.

What is dracut and why would it change this?

As no other distro does this kind of waiting, I'm a bit confused as to
the need for it.

thanks,

greg k-h
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