linux-kernel - Re: [PATCH 1/3] SCSI: Allow platform-specific code to be run against the SCSI tree

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Date:	Mon, 10 Aug 2009 11:03:07 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Matthew Garrett <mjg@...hat.com>
Cc:	linux-acpi@...r.kernel.org, linux-scsi@...r.kernel.org,
	shaohua.li@...el.com, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] SCSI: Allow platform-specific code to be run
 against the SCSI tree

On Mon, 2009-08-10 at 15:58 +0100, Matthew Garrett wrote:
> On Mon, Aug 10, 2009 at 02:55:25PM +0000, James Bottomley wrote:
> > On Mon, 2009-08-10 at 14:38 +0100, Matthew Garrett wrote:
> > > On Mon, Jul 13, 2009 at 10:03:05PM +0100, Matthew Garrett wrote:
> > > > In certain cases (such as ACPI) we want to be able to associate
> > > > platform-specific data against the SCSI device tree. Handling this
> > > > properly requires the ability to run platform code at SCSI init time.
> > > > This patch adds stub functions that can be overridden if the platform
> > > > defines CONFIG_SCSI_PLATFORM.
> > > 
> > > James, any thoughts on this?
> > 
> > Sorry, I'd thought this had all moved to libata so I'd stopped paying
> > attention ... why are extra bits in SCSI necessary?
> 
> They're SCSI as far as the device tree is concerned, so the glue 
> callbacks have to be registered from the SCSI layer. The only 
> implementation so far is for ACPI and only covers libata, but it could 
> potentially also be used to tie bay devices to the ofw tree on 
> openfirmware systems.

It's hard for me to comment without seeing the scsi_platform_register
code, but it strikes me that the only SCSI piece it's using is the
scsi_bus ... what else is SCSI specific in there?

James


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