linux-kernel - Re: "Fix ATAPI transfer lengths" causes CD writing regression

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Date:	Tue, 6 Nov 2007 12:48:21 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Tejun Heo <htejun@...il.com>
Cc:	albertl@...l.com, albertcc@...ibm.com,
	Daniel Drake <dsd@...too.org>, Jeff Garzik <jeff@...zik.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux list <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org
Subject: Re: "Fix ATAPI transfer lengths" causes CD writing regression

> Just to make sure I'm not misunderstanding it.  So, PDC202xx will lock
> up if you transfer allocation size, reset and then try to drain, but
> it's okay to keep draining as part of continued PIO transfer, right?

The following hang mine:

	PIO transfer
	Reset state machine
	Read data register


	DMA transfer in progress
	Read data register

And this does not

	PIO transfer
	Keep reading data register while checking DRQ

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