linux-kernel - Re: bug in drivers/edac/mpc85xx_edac.c:mpc85xx_mc

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Date:	Mon, 13 Apr 2009 10:10:36 -0700
From:	Dave Jiang <djiang@...sta.com>
To:	Jeff Haran <jharan@...cade.COM>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Doug Thompson <dougthompson@...ssion.com>,
	Kumar Gala <galak@...nel.crashing.org>, linuxppc-dev@...abs.org
Subject: Re: bug in drivers/edac/mpc85xx_edac.c:mpc85xx_mc_check() ?

Jeff, you are correct. I will submit a patch to correct that.

Andrew Morton wrote:
> (cc's added)
> 
> On Wed, 8 Apr 2009 14:57:42 -0700
> "Jeff Haran" <jharan@...cade.COM> wrote:
> 
>> Hi,
>>
>> Recent versions of this function start off with:
>>
>> static void mpc85xx_mc_check(struct mem_ctl_info *mci)
>> {
>>     struct mpc85xx_mc_pdata *pdata = mci->pvt_info;
>>     ...
>>
>>     err_detect = in_be32(pdata->mc_vbase + MPC85XX_MC_ERR_DETECT);
>>     if (err_detect)
>>         return;
>>
>>     ...
>> }
>>
>> My reading of the Freescale 8548E Manual leads me to conclude that the
>> Memory Error Detect register (ERR_DETECT) will have various bits set if
>> the memory controller has detected an error since the last time it was
>> cleared. If no memory error has occurred, the register will contain 0.
>>
>> Perhaps I am missing something very basic, but it seem to me that the
>> above "if" should be:
>>
>>     if (!err_detect)
>>         return;
>>
>> as the existing code would seem to read "if any errors have occurred,
>> ignore them", though perhaps testing has demonstrated that the Freescale
>> manual is in error.
>>
>> Please include this email address in responses as I do not subscribe.
>>
>> Thanks,
>>
>> Jeff Haran
>> Brocade
> 


-- 

------------------------------------------------------
Dave Jiang
Software Engineer
MontaVista Software, Inc.
http://www.mvista.com
------------------------------------------------------

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