linux-kernel - Re: 2.6.26-rc1 regression: ISA DMA broken (bisected)

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Date:	Tue, 13 May 2008 18:01:07 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Takashi Iwai <tiwai@...e.de>,
	Rene Herman <rene.herman@...access.nl>,
	Glauber Costa <gcosta@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Pete Clements <clem@...m.clem-digital.net>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	ALSA devel <alsa-devel@...a-project.org>
Subject: Re: 2.6.26-rc1 regression: ISA DMA broken (bisected)

On Tue, 13 May 2008 10:59:32 -0600
Bjorn Helgaas <bjorn.helgaas@...com> wrote:

> On Friday 09 May 2008 12:06:55 am Takashi Iwai wrote:
> > Thanks for catching it.  Yeah, the patch looks buggy.  We had an
> > implicit assumption that dev = NULL for ISA devices that require 24bit
> > DMA.
> 
> Naive question #1:  Why don't we have a struct device for these
> ISA devices?  PNP builds a struct device with DMA_24BIT_MASK
> for ISAPNP devices.

Because nobody has done the needed work to get all the old ISA drivers
converted. I guess isa_device would actually be a platform_device
wrapper ?

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