linux-kernel - Re: [PATCH RFC] x86: Fix 64-bit DMA masks on VIA

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Message-Id: <200804241606.00883.mb@bu3sch.de>
Date:	Thu, 24 Apr 2008 16:06:00 +0200
From:	Michael Buesch <mb@...sch.de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>, vojtech@...e.cz,
	muli@...ibm.com, jdmason@...zu.us, tglx@...utronix.de,
	mingo@...hat.com
Subject: Re: [PATCH RFC] x86: Fix 64-bit DMA masks on VIA

On Thursday 24 April 2008 15:43:50 Andi Kleen wrote:
> Michael Buesch <mb@...sch.de> writes:
> 
> > This untested patch is supposed to fix DMAing on some VIA boards.
> > Currently the DMA subsystem returns an error, if the driver does
> > tell that it supports a 64bit DMA mask. So the driver probing
> > would fail in that case. 
> 
> The driver is broken then. It is supposed to retry with a small
> mask on an error. Please fix the driver.

I already added a workaround to the driver.
Why do we need to workaround this in _every_ driver? (Note that _every_
driver supporting a 64bit mask is affected). Why not fix it in the DMA layer?

-- 
Greetings Michael.
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