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From: David Brownell <david-b@pacbell.net>
To: Alan Stern <stern@rowland.harvard.edu>
Subject: Re: [PATCH 1/1] drivers/usb/host/pci-quirks.c: wait for EHCI handoff far too long in quirk_usb_disable_ehci()
Date: Fri, 12 Sep 2008 16:28:59 -0700
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Cc: Steven Noonan <steven.noonan@uplinklabs.net>,
       Andrew Morton <akpm@linux-foundation.org>,
       Kernel development list <linux-kernel@vger.kernel.org>,
       Steven Noonan <steven@uplinklabs.net>,
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On Tuesday 09 September 2008, Alan Stern wrote:
> > > 
> > > The delay in the current version of pci-quirks.c is 5 seconds,
> > > which I've cut down to 0.5 seconds.
> 
> > I guess it risks breaking someone else's system.  Or perhaps the number
> > was just grabbed out of the air.
> 
> As far as I know, it was indeed just grabbed out of the air.  The spec 
> specifically avoids giving an upper limit on how long to wait.
> 
> > Can we do a separate quirk just for that machine (and ones with the
> > same bug)?
> 
> My BIOS has the same bug.  I wouldn't mind seeing the delay reduced.

I'm fairly sure that someone's system needed more than 1/2 second.
And that going from 500 to 5000 was the obvious "add a zero" way
to get to a long-enough timeout.