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Message-id: <474382D8.1050507@shaw.ca>
Date: Tue, 20 Nov 2007 18:59:04 -0600
From: Robert Hancock <hancockr@...w.ca>
To: Tejun Heo <htejun@...il.com>
Cc: linux-kernel <linux-kernel@...r.kernel.org>,
ide <linux-ide@...r.kernel.org>, Jeff Garzik <jeff@...zik.org>
Subject: Re: [PATCH 1/2] sata_nv: don't use legacy DMA in ADMA mode
Tejun Heo wrote:
> Tejun Heo wrote:
>> If so, can you please add that switching into register mode is okay as
>> long as there's no other ADMA commands in flight and add
>> WARN_ON((qc->flags & ATA_QCFLAG_RESULT_TF) && link->sactive)?
>
> More accurately, link->sactive test can be substituted with
> (ap->qc_allocated & ~(1 << qc->tag)).
Unfortunately we only get the ata_port and ata_taskfile in the tf_read
callback, so I'm not sure if we can do the equivalent of the qc->flags &
ATA_QCFLAG_RESULT_TF test (i.e. distinguishing between the
error-handling case where we care if we abort outstanding commands and
the normal case with a RESULT_TF command where we do)..
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/
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