linux-kernel - Re: [RFC/PATCH] usb-storage: wait for device scanning before mounting root

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Date:	Thu, 19 Jun 2008 17:39:35 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matthew Wilcox <matthew@....cx>
cc:	Pekka J Enberg <penberg@...helsinki.fi>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	<linux-kernel@...r.kernel.org>, <dsd@...too.org>,
	<mdharm-usb@...-eyed-alien.net>, <linux-usb@...r.kernel.org>,
	<vegardno@....uio.no>, <James.Bottomley@...senPartnership.com>,
	<linux-scsi@...r.kernel.org>, Greg KH <greg@...ah.com>
Subject: Re: [RFC/PATCH] usb-storage: wait for device scanning before mounting
 root

On Thu, 19 Jun 2008, Matthew Wilcox wrote:

> This discussion seemed to die off ... did anything ever come of it?

As I recall, it died because the whole notion was very poorly defined
to begin with.  The idea was to stop waiting when all the SCSI buses
had been scanned -- but there's no way to know when that occurs because
new buses can be added at any time.

Maybe a better approach would be to poll at reasonable intervals 
(HZ/10, for example) for the existence of the root device.  If it 
hasn't appeared after some reasonable time (30 seconds?) then give up.

Alan Stern

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