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SubjectRe: sata_nv - ADMA issues with 2.6.20
Björn Steinbrink wrote:
> If the look like this, you might want to try a few patches that are in
> -mm.
>
> ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x2 frozen
> ata1.00: cmd e7/00:00:00:00:00/00:00:00:00:00/a0 tag 0 cdb 0x0 data 0 out
> res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
> ata1: soft resetting port
>
> We thought that Robert had fixed these with some changes that went into
> -rc6. But they reappeared a few days later, the -mm patches seem to have
> finally cured it.
>
> The original patches are here:
>
> http://www2.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc6/2.6.20-rc6-mm3/broken-out/sata_nv-cleanup-adma-error-handling-v2.patch
> http://www2.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc6/2.6.20-rc6-mm3/broken-out/sata_nv-cleanup-adma-error-handling-v2-cleanup.patch
> http://www2.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.20-rc6/2.6.20-rc6-mm3/broken-out/sata_nv-use-adma-for-nodata-commands.patch
>
> As they had a few rejects against 2.6.20-rc7, I'm attaching my fixed all-in-one version of these patches, I guess it should apply to 2.6.20 just fine.

This isn't quite the same as that problem we were seeing, these are an
actual NCQ read/write that is timing out and not a cache flush command.
Nevertheless it wouldn't hurt for people having this problem to test out
the latest and greatest sata_nv patches. In particular there was one
that I resurrected from the debugging of that problem, "sata_nv: wait
for response on entering/leaving ADMA mode" which though it didn't end
up fixing it, seemed like a good thing to be doing anyway, and which
potentially might have some effect on this problem here.

All the patches I have for sata_nv are in Linus' git tree, that is
probably a simpler way to test them than -mm right now - applying the
2.6.20-git6 patch on top of 2.6.20 should do it.

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

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