Re: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM

[Stephan Diestelhorst <stephan.diestelhorst@amd.com>]

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On Tuesday 17 August 2010 10:08:53 Tejun Heo wrote:
> Hello,
> 
> On 08/17/2010 09:51 AM, Stephan Diestelhorst wrote:
> > On Thursday 05 August 2010 18:08:02 Tejun Heo wrote:
> >> Can you please try the following patch and see whether the problem
> >> goes away?
> > 
> > I've finally managed to get this to compile and test. (Hit a bug with
> > Debian's make-kpkg and other nuisances...)
> > 
> > The problem is still there. On some resumes I get the dreadful dead
> > disk again:
> > 
> > end_request: I/O error , dev sda sector ...
> > sd 0:0:0:0: [sda] Unhandled error code
> > sd 0:0:0:0: [sda] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
> > sd 0:0:0:0: [sda] CDB: Read(10): 28 00 0e a4 77 a8 0 00 08 00
> > (many of those)
> > 
> > Can't access /var/log/messages right now, due to broken I/O. Will try
> > to trigger it again and check for the qc timeout messages..
> 
> Yeah, it would great to have the log.  So, it seems like the hardware
> is actually buggy then.  :-(

Indeed. Like I said, I have similar issues on a another Samsung HDD in
an AMD system. I have not yet got around to try the fix there, but I
suspect it is the same thing.

I have attached the full /var/log/messages and /var/log/kern.log with
multiple suspend-to-ram runs and the last one failing.

Would it make sense to add Rafael's workaround upstream, maybe enabling
it only for particular platforms / HDDs / with a parameter?

Thanks,
  Stephan
-- 
Stephan Diestelhorst, AMD Operating System Research Center
stephan.diestelhorst@amd.com, Tel. +49 (0)351 448 356 719

Advanced Micro Devices GmbH Einsteinring 24 85609 Dornach
General Managers: Alberto Bozzo, Andrew Bowd
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