Re: SATA Problem: port is slow to respond

[Rodney Padgett <rodney.padgett@nuth.nhs.uk>]

Tejun Heo <htejun <at> gmail.com> writes:

> 
> Sigmund Scheinbar wrote:
> > Tejun Heo wrote:
> >> Please apply the attached patch over 2.6.20.1 and report how it works.
> > 
> > I'm afraid that something went wrong while patching:
> 
> Sorry, it was generated against the wrong tree.  Regenerated patch attached.
> 
> > BTW.: I'm just curious, what's the "purpose" of this patch, it looks to
> > me like it is just going to ignore the problem? Or do you think that the
> > hardware is faulty?
> 
> ATAPI devices use error conditions regularly to report all sorts of
> things including media not present.  In some variants of ahci's, this
> sets seemingly unrelated error bits - JMBs set interface error and
> sb600s seem to set internal error.  These errors when interpreted
> literally require device reset to recover from thus ATAPI devices never
> get through device ready check.  So, the patch makes ahci driver
> suppress those spurious errors.
> 
I had the same problem with kernel 2.6.20.3 (from kernel.org) on the same
machine (HP dc5750). I applied your patch, and the cd drive now works! dmesg
shows no errors logged, and I can access the drive without any problem.

Thanks,

Rod.