Re: libata 2.6.5->2.6.6 regression -part II

[Bill Davidsen <davidsen@tmr.com>]

On Fri, 21 May 2004, Bartlomiej Zolnierkiewicz wrote:

> On Friday 21 of May 2004 14:06, Bill Davidsen wrote:
> > Bartlomiej Zolnierkiewicz wrote:
> > > On Monday 17 of May 2004 18:34, Brad Campbell wrote:
> > >>G'day all,
> > >>I caught the suggestion on my last post in the archives, but because I'm
> > >>not subscribed and wasn't cc'd I can't keep it threaded.
> > >>
> > >>I tried backing out the suggested acpi patch (No difference at all), and
> > >> I managed to get apic to work but it still hangs solid in the same
> > >> place.
> > >>
> > >>dmesg attached.
> > >>
> > >>I managed to figure out that the VIA ATA driver captures my sata drives
> > >> on the via ports, explaining why sata_via misses them, but writing data
> > >> to those drives (hde & hdg) causes dma timeouts and locks the machine.
> > >> No useful debug info produced. The machine becomes non-responsive,
> > >> throws a couple of dma timeouts to the console and then loses all
> > >> interactivity (keyboard, serial, network) forcing a reset push.
> > >>
> > >>Is there any way I can prevent the VIA ATA driver capturing this device?
> > >>Unfortunately my boot drive is on hda on the on-board VIA ATA interface
> > >> so I need it compiled in.
> > >
> > > Disable the fscking PCI IDE generic driver.
> > > [ You are not the first one tricked by it. ]
> > >
> > > AFAIR support for VIA 8237 was added to it before sata_via.c was ready.
> > > [ but my memory is... ]
> >
> > What would happen if the generic driver was initialized last? That would
> > let other more specific drivers grab devices first. The model which
> > comes to mind is a route table, smallest subnet (or in this case most
> > specific) being used first. Or would that open a whole other nest of
> > snakes?
> 
> I think that you are confusing PCI IDE generic driver with IDE generic driver
> (the latter is already called after the former).
> 
> Brad's problem was IDE driver (pci/generic.c) vs libata driver (sata_via.c).

I was indeed doing just that, but I guess the sense of the question is
still valid, what would the implications of doing the sata_via before the
pci/generic be? Would it address the original problem, and if so what
would break, if anything? You noted this is not the first time the
problem has been seen.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.