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

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Date:	Wed, 14 Nov 2007 10:57:58 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Mark Lord <liml@....ca>
CC:	Robert Hancock <hancockr@...w.ca>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ide <linux-ide@...r.kernel.org>, Jeff Garzik <jeff@...zik.org>
Subject: Re: [PATCH] sata_nv: fix ADMA ATAPI issues with memory over 4GB

Mark Lord wrote:
> Tejun Heo wrote:
>> Robert Hancock wrote:
>>> Tejun Heo wrote:
> ..
>>> Yes, it should likely do something with these return values. Though
>>> theoretically it shouldn't fail, since the DMA mask is either 32-bit,
>>> which shouldn't fail, or one that was successfully set before. Also I
>>> don't think the SCSI layer actually checks the slave_config return
>>> value.. sigh.
>>
>> Then please at least add WARN_ON() && another reason why allocating /
>> deallocating resources from ->slave_config isn't such a good idea.
> ..
> 
> The entire point of "slave_configure" is to provide a point for the LLD
> to do per-device data structure allocation/init.
> 
> And yes, SCSI does check the return code.  Whether the code around that
> check
> is buggy or not is another question, but it's always worked for me.

I see but I still prefer having PRD, pad buf allocation/release in
->port_start/stop() primarily for consistency.  Robert, what do you think?

-- 
tejun
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