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

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Message-ID: <s5hzlqtb5k7.wl%tiwai@suse.de>
Date:	Wed, 14 May 2008 11:25:44 +0200
From:	Takashi Iwai <tiwai@...e.de>
To:	Bjorn Helgaas <bjorn.helgaas@...com>
Cc:	Rene Herman <rene.herman@...access.nl>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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)

At Tue, 13 May 2008 17:18:39 -0600,
Bjorn Helgaas wrote:
> 
> On Tuesday 13 May 2008 11:33:25 am Rene Herman wrote:
> > On 13-05-08 19:01, Alan Cox wrote:
> > > 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 ?
> > 
> > No, isa_device is its own thing, on its own isa_bus (*). It has a struct 
> > device * readily available though...
> > 
> > (*) drivers/base/isa.c, and explanatory changelog at:
> > 
> > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a5117ba7da37deb09df5eb802dace229b3fb1e9f
> 
> Thanks for the nice changelog.
> 
> isa_register_driver() currently doesn't set a DMA mask.  Should it?
> 
> I only see about 35 dma_alloc_coherent() calls that pass NULL.  I
> guess even those would be a fair amount of work to change, and I
> suppose there would be more that I missed.

There are 5 pci_alloc_consistent() with NULL, too.


Takashi
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