linux-kernel - Re: Linux 2.6.25-rc4

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Date:	Sun, 16 Mar 2008 12:39:43 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Anders Eriksson <aeriksson@...tmail.fm>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Jens Axboe <jens.axboe@...cle.com>,
	Ingo Molnar <mingo@...e.hu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.25-rc4



On Sun, 16 Mar 2008, Alan Cox wrote:
> 
> No it doesn't. DRQ simply means "drive has more data for the controller
> if you want it". Interrupts are controlled via IEN and the interrupt line.

A _lot_ of chips require you to clear the DRQ by taking the data they 
have.

> If the drive wants to give us data and we end the transaction that is
> fine. In practice a tiny few devices crap themselves if we don't.

More than a few tiny devices from what I remember. It tends to be the 
other way around - most devices do *not* want to get new commands until 
you've finished the previous one by draining the queues.

		Linus
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