linux-kernel - Re: [PATCH] libsas: support NCQ for SATA disks

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Date:	Tue, 17 Oct 2006 11:35:37 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	brking@...ibm.com, "Darrick J. Wong" <djwong@...ibm.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alexis Bruemmer <alexisb@...ibm.com>,
	Mike Anderson <andmike@...ibm.com>
Subject: Re: [PATCH] libsas: support NCQ for SATA disks

On Tue, 2006-10-17 at 07:15 -0400, Jeff Garzik wrote:
> Brian King wrote:
> > This doesn't look like the right fix for the oops you were seeing. The
> > SAS usage of libata has ap->scsi_host as NULL, which indicates that
> > libata does not own the associated scsi_host. I'm concerned you may
> > have broken some other code path by making this change. I think the correct
> > fix may require removing the dependence of ap->scsi_host from
> > ata_dev_config_ncq. 
> 
> Yep.  I had already mentioned this on IRC.

I understand, but right at the moment, my priority is sorting out the
aic94xx driver so that it works with SATA devices.  It has become
apparent that there's some need for a bit of code sorting out in libata
to drive intelligent sas controllers, so we can take a look at bugs in
ata_dev_config_ncq() when someone's time frees up to look into the
libata issues.

James



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