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Message-ID: <20071106124821.3c7a5ca5@the-village.bc.nu>
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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