Date: Thu, 19 Jun 2008 12:52:40 -0700
From: Matthew Dharm <mdharm-kernel@one-eyed-alien.net>
To: Matthew Wilcox <matthew@wil.cx>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>,
       Pekka J Enberg <penberg@cs.helsinki.fi>,
       Alan Stern <stern@rowland.harvard.edu>, linux-kernel@vger.kernel.org,
       dsd@gentoo.org, linux-usb@vger.kernel.org, vegardno@ifi.uio.no,
       James.Bottomley@HansenPartnership.com, linux-scsi@vger.kernel.org,
       Greg KH <greg@kroah.com>
Subject: Re: [RFC/PATCH] usb-storage: wait for device scanning before mounting root
Message-ID: <20080619195240.GX19934@one-eyed-alien.net>
Mail-Followup-To: Matthew Wilcox <matthew@wil.cx>,
	Stefan Richter <stefanr@s5r6.in-berlin.de>,
	Pekka J Enberg <penberg@cs.helsinki.fi>,
	Alan Stern <stern@rowland.harvard.edu>,
	linux-kernel@vger.kernel.org, dsd@gentoo.org,
	linux-usb@vger.kernel.org, vegardno@ifi.uio.no,
	James.Bottomley@HansenPartnership.com, linux-scsi@vger.kernel.org,
	Greg KH <greg@kroah.com>
References: <Pine.LNX.4.44L0.0804241704220.14840-100000@iolanthe.rowland.org> <Pine.LNX.4.64.0804250022160.1209@sbz-30.cs.Helsinki.FI> <48118DDD.8010507@s5r6.in-berlin.de> <Pine.LNX.4.64.0804251110400.758@sbz-30.cs.Helsinki.FI> <20080425091122.GA14990@parisc-linux.org> <20080619182310.GA30833@parisc-linux.org> <485AA7EA.6080105@s5r6.in-berlin.de> <20080619185419.GN4392@parisc-linux.org>
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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 (initiato=
r=20
> > port representations, or something remotely related to that) are=20
> > instantiated, but rather _when_ they are instantiated.  On multi=20
> > protocol buses or networks like USB and FireWire, it makes sense to=20
> > create the SCSI initiator port representation when we discovered that=
=20
> > there are actually SCSI targets on the bus or network.
>=20
> 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

--=20
Matthew Dharm                              Home: mdharm-usb@one-eyed-alien.=
net=20
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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