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

Jeff Garzik
2006-12-06T09:13:45Z

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