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

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Date:	Thu, 19 Jun 2008 12:52:40 -0700
From:	Matthew Dharm <mdharm-kernel@...-eyed-alien.net>
To:	Matthew Wilcox <matthew@....cx>
Cc:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Pekka J Enberg <penberg@...helsinki.fi>,
	Alan Stern <stern@...land.harvard.edu>,
	linux-kernel@...r.kernel.org, dsd@...too.org,
	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, Jun 19, 2008 at 12:54:19PM -0600, Matthew Wilcox wrote:
> On Thu, Jun 19, 2008 at 08:39:38PM +0200, Stefan Richter wrote:
> > The problem is AFAIU not exactly how many Scsi_Host instances (initiator 
> > port representations, or something remotely related to that) are 
> > instantiated, but rather _when_ they are instantiated.  On multi 
> > protocol buses or networks like USB and FireWire, it makes sense to 
> > create the SCSI initiator port representation when we discovered that 
> > there are actually SCSI targets on the bus or network.
> 
> I'm not convinced of that.  Why shouldn't we create one scsi host for
> all USB scsi devices?  I know that today there's a certain amount of
> per-device state stored in the scsi_host, but that should be fixable.

First, there are usb-storage devices which are USB<->SCSI bridges and
therefore support multiple target devices.

Second, you would still need multiple hosts when you have more than 15
target USB devices, anyway.

Matt

-- 
Matthew Dharm                              Home: mdharm-usb@...-eyed-alien.net 
Maintainer, Linux USB Mass Storage Driver

E:  You run this ship with Windows?!  YOU IDIOT!
L:  Give me a break, it came bundled with the computer!
					-- ESR and Lan Solaris
User Friendly, 12/8/1998

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