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

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Message-ID: <20071104234205.7627d007@the-village.bc.nu>
Date:	Sun, 4 Nov 2007 23:42:05 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	albertl@...l.com
Cc:	albertcc@...ibm.com, Tejun Heo <htejun@...il.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

> Maybe we could set a limit here. If the ATAPI device keeps DRQ=1 and
> exceeds the limit, we consider it as HSM violation and have EH handle it.

On a DMA transfer its basically out of our control (and a PIO drain will
lock some controllers solid until power cycle), but on PIO we know we
never set a chunk size over 64K, so if we exceed 64K its time to apply a
larger hammer
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