[Bug 14831] mptsas - Use of ATA command pass-through results in unreliable operation - drive / controller resets

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https://bugzilla.kernel.org/show_bug.cgi?id=14831





--- Comment #16 from kdesai <kashyap.desai@lsi.com>  2010-05-04 05:16:28 ---
(In reply to comment #15)
> Take a look at my diagnosis here:
> http://lkml.org/lkml/2010/4/26/335
> 
> It includes a rough-draft patch.  I'd be very interested in hearing reports of
> whether this fixes this smartctl issue in others' environments as it has in
> mine.
I am doing my analysis and meanwhile also in touch with our Firmware folks to
understand this issue.   Using Ryan's diagnosis tool I am able to see LSI
controller is not able to DMA for particular alignment. I will update this
ASAP.
Thanks, Kashyap
> 
> The reason I haven't proposed it as a real patch is that there's probably a
> better location for that code.  Where I have it, it'll apply to every SCSI host
> using the MPT Fusion framework, and if it's a hardware bug, perhaps we want it
> to apply only to this specific LSI 1068 controller.
> 
> That said, I expect most requests hitting the device are already well-aligned,
> so this wouldn't affect many requests even if it did apply to a
> broader-than-necessary collection of hardware.

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