linux-kernel - Re: sata_sil24 broken since 2.6.23-rc4-mm1

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Date:	Thu, 27 Sep 2007 13:57:39 +0900
From:	Tejun Heo <htejun@...il.com>
To:	Torsten Kaiser <just.for.lkml@...glemail.com>
CC:	Jeff Garzik <jeff@...zik.org>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: sata_sil24 broken since 2.6.23-rc4-mm1

Tejun Heo wrote:
> Torsten Kaiser wrote:
>> Comparing the driver/ata directory from rc3-mm1 and rc4-mm1 the
>> following change looked the most suspicions to me:
>> http://git.kernel.org/?p=linux/kernel/git/jgarzik/libata-dev.git;a=blobdiff;f=drivers/ata/sata_sil24.c;h=3dcb223117be9739ee04d70b6bfc776a4b839a3f;hp=e0cd31aa8002350add53ba6ff07493e503275244;hb=020bc1bd8d369a77bd9379cd9763ac0057651753;hpb=8d4bdf8087e682df98bdb856f6ad451bf6d597e7
>>
>> That after rc4-mm1 the sata_sil24.c did not change anymore also
>> matches the occurrence of the error.
>>
>> To confirm my theorie I exchanged the sata_sil24.c from rc8-mm1 with
>> the version from rc3-mm1.
>> I was able to boot the resulting kernel successfully 5 times, without
>> the error happening again.
> 
> Thanks a lot for chasing down the problem.  The changed code is address
> initialization path and it's weird that it causes intermittent failures,
> not a consistent one.
> 
> Anyways, does the attached patch fix the problem?

If not, can you add printk of iomap[SIL24_PORT_BAR], offset, initialized
cmd_addr and scr_addr in the loop and see whether anything is different
between when the driver works and fails.

Thanks.

-- 
tejun
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