Re: [PATCH 2.6.19 2/3] sata_promise: new EH conversion

[Jeff Garzik <jeff@garzik.org>]

Mikael Pettersson wrote:
> On Sun, 03 Dec 2006 22:00:42 +0900, Tejun Heo wrote:
> > Mikael Pettersson wrote:
> > > +}
> > > +
> > > +static void pdc_error_handler(struct ata_port *ap)
> > > +{
> > > +	struct ata_eh_context *ehc = &ap->eh_context;
> > > +	ata_reset_fn_t hardreset;
> > > +
> > > +	/* stop DMA, mask IRQ, don't clobber anything else */
> > > +	ata_eh_freeze_port(ap);
> > Don't freeze port unconditionally.  You'll end up hardresetting on every
> > error.  Just make sure DMA engine is stopped and the controller is in a
> > sane state.  If that fails, then, the port should be frozen.
>
> I'm looking into this now, but so far it seems only a reset
> (what Promise calls software reset, I don't know if libata
> considers it a soft or hard reset) of the ATA channel will do.
>
> > > +	hardreset = NULL;
> > > +	if (sata_scr_valid(ap)) {
> > > +		ehc->i.action |= ATA_EH_HARDRESET;
> > Why always force HARDRESET?
>
> I based that on sata_sil24:
>
> 	if (sil24_init_port(ap)) {
> 		ata_eh_freeze_port(ap);
> 		ehc->i.action |= ATA_EH_HARDRESET;
> 	}
>
> I interpreted the ATA_EH_HARDRESET as being required due to
> the ata_eh_freeze_port(), but perhaps it's only there because
> sil24_init_port() returned failure?
>
> A different issue, but of practical importance, is which
> libata branch I should base the EH conversion on: #upstream
> or #ALL? Andrew Morton's -mm kernels include the ALL patches,
> but they in turn include the promise-sata-pata patches, and
> there is a conflict between the PATA patch and the EH conversion.
> Currently my EH conversion is based on #upstream, and I've ported
> the PATA patch to apply on top of it.

It's a tiered system ;-)

* if at all possible, provide patches against the latest linux-2.6.git

* if there are dependencies in #upstream-fixes or #upstream (i.e. I 
already applied some of your patches), provide patches against 
#upstream-fixes or #upstream

#ALL is a branch that is blown away at will, and is really more of a 
testing and akpm sync point.  Don't worry about conflicts with 
promise-sata-pata, I take care of those when I merge the #ALL branch 
together.

	Jeff



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