linux-kernel - RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

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Message-ID: <15F501D1A78BD343BE8F4D8DB854566B1BFE2AC2@hkemmail01.nvidia.com>
Date:	Mon, 14 Jan 2008 14:23:04 +0800
From:	"Kuan Luo" <kluo@...dia.com>
To:	"Robert Hancock" <hancockr@...w.ca>
Cc:	"Tejun Heo" <htejun@...il.com>, "Mark Lord" <liml@....ca>,
	"Jeff Garzik" <jeff@...zik.org>,
	"IDE/ATA development list" <linux-ide@...r.kernel.org>,
	"Allen Martin" <AMartin@...dia.com>,
	"Peer Chen" <pchen@...dia.com>,
	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"David Milburn" <dmilburn@...hat.com>
Subject: RE: fixed a bug of adma in rhel4u5 with HDS7250SASUN500G.

Robert Hancock wrote:
> As I mentioned, this doesn't seem to resolve the problem we're seeing 
> with rapidly intermixed NCQ commands and cache flushes (at 
> least, if I 
> take out the arbitrary 20usec delay from the driver and add 
> this patch, 
> the problem still shows up). It could be a similar problem, 
> though, of 
> commands being issued before the controller is really ready 
> for them. If 
> you or others at NVIDIA could assist in tracking down that problem it 
> would be appreciated..
>
Ok , i will track down that problem. 
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