linux-kernel - Re: [PATCH 2/3] mg_disk: fix dependency on libata

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Message-ID: <49F3DCD5.2070909@garzik.org>
Date:	Sun, 26 Apr 2009 00:02:29 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Tejun Heo <tj@...nel.org>
CC:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	unsik Kim <donari75@...il.com>, linux-kernel@...r.kernel.org,
	Linux IDE mailing list <linux-ide@...r.kernel.org>
Subject: Re: [PATCH 2/3] mg_disk: fix dependency on libata

Tejun Heo wrote:
> Bartlomiej Zolnierkiewicz wrote:
>> Add local copies of ata_id_string() and ata_id_c_string() to mg_disk
>> so there is no need for the driver to depend on ATA and SCSI.
>>
>> Cc: unsik Kim <donari75@...il.com>
>> Cc: Tejun Heo <tj@...nel.org>
>> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> 
> Ah.. right, that's a rather large dependency to pull in just for the
> string functions.  Yeah, I think it would be better to keep local
> copy at elast for now.
> 
> Acked-by: Tejun Heo <tj@...nel.org>

Actually...  NVMHCI[1] uses the same style of id string extraction, even 
though its command set is wholly new and unrelated to ATA.  I copied 
into drivers/block/nvmhci.c[2] id_string, id_c_string and another 
useful, generic routine: ata_wait_register.

So, once nvmhci goes upstream, that will be a third copy...  nvmhci 
still has rough edges, but it's mainly waiting on hardware "it works" 
verification at this point.

	Jeff



[1] http://download.intel.com/standards/nvmhci/spec.pdf

[2] 'nvmhci' branch of 
git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git

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