linux-kernel - Re: SATA exceptions with 2.6.20-rc5

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Date:	Sun, 21 Jan 2007 18:17:01 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Björn Steinbrink <B.Steinbrink@....de>
Cc:	Jeff Garzik <jeff@...zik.org>, Chr <chunkeey@....de>,
	Alistair John Strachan <s0348365@....ed.ac.uk>,
	linux-kernel@...r.kernel.org, htejun@...il.com,
	jens.axboe@...cle.com, lwalton@...l.com, pomac@...or.com
Subject: Re: SATA exceptions with 2.6.20-rc5

Björn Steinbrink wrote:
> On 2007.01.21 13:58:01 -0600, Robert Hancock wrote:
>> Björn Steinbrink wrote:
>>> All kernels were bad using that approach. So back to square 1. :/
>>>
>>> Björn
>>>
>> OK guys, here's a new patch to try against 2.6.20-rc5:
>>
>> Right now when switching between ADMA mode and legacy mode (i.e. when 
>> going from doing normal DMA reads/writes to doing a FLUSH CACHE) we just 
>> set the ADMA GO register bit appropriately and continue with no delay. 
>> It looks like in some cases the controller doesn't respond to this 
>> immediately, it takes some nanoseconds for the controller's status 
>> registers to reflect the change that was made. It's possible that if we 
>> were trying to issue commands during this time, the controller might not 
>> react properly. This patch adds some code to wait for the status 
>> register to change to the state we asked for before continuing.
> 
> Just got two exceptions with your patch, none of the debug messages were
> issued.
> 
> Björn

Hmm, another miss, apparently.. Has anyone tried removing these lines
from nv_host_intr in 2.6.20-rc5 sata_nv.c and see what that does?

     /* bail out if not our interrupt */
     if (!(irq_stat & NV_INT_DEV))
         return 0;

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


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