linux-kernel - Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

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Message-id: <475AE42A.9040400@shaw.ca>
Date:	Sat, 08 Dec 2007 12:36:26 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, Tejun Heo <htejun@...il.com>
Subject: Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB (v3)

Jeff Garzik wrote:
> Robert Hancock wrote:
>> This fixes some problems with ATAPI devices on nForce4 controllers in 
>> ADMA mode
>> on systems with memory located above 4GB. We need to delay setting the 
>> 64-bit
>> DMA mask until the PRD table and padding buffer are allocated so that 
>> they don't
>> get allocated above 4GB and break legacy mode (which is needed for ATAPI
>> devices).
>>
>> Signed-off-by: Robert Hancock <hancockr@...w.ca>
> 
> This is a bit nasty :/
> 
> I would consider setting the consistent DMA mask to 32-bit, and setting 
> the overall mask to 64-bit.
> 
> Seems like that would solve the problem?
> 
> Also, does this need to be rebased on top of what I just pushed upstream?
> 
>     Jeff

Jeff, ping on this one? This (or, one like it) really should make it 
into 2.6.24..

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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