linux-kernel - Re: USB storage no-boot regression (bisected)

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Message-ID: <20090415202052.GA14325@cuplxvomd02.corp.sa.net>
Date:	Wed, 15 Apr 2009 13:20:52 -0700
From:	VomLehn <dvomlehn@...co.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Mark Lord <lkml@....ca>,
	Alan Stern <stern@...land.harvard.edu>,
	Greg KH <greg@...ah.com>, Jeff Garzik <jeff@...zik.org>,
	Linux USB kernel mailing list <linux-usb@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: USB storage no-boot regression (bisected)

On Wed, Apr 15, 2009 at 01:06:14PM -0700, Arjan van de Ven wrote:
> For other pieces it's hard. Non-enumeratable busses just suck;
> at some point all you can do is just wait (which we have already 
> available today for anyone to do). I realize people don't want to
> just wait 4 seconds (the people who first objected to boot time
> improvements then suddenly care about boot time ;-)...

We can do better than just waiting. What we want to do is to wait
until a suitable device becomes available. For USB console, the patch
I submitted yesterday waits for the first console to be registered.
That might not be quite right, but it's a lot better than no console
at all. For network devices, we have to wait for a specific device and
I haven't had a chance to look at this. For both types of devices, we
can timeout after a reasonable interval, for some definition of reasonable.

Waiting for a suitable device preserves fast boot times, timing out allows
the system to come up enough to try to diagnose the problem.

David VomLehn
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