On 12 Jan 2001, Linus Torvalds wrote:

> In article <Pine.LNX.4.10.10101121009230.1147-100000@master.linux-ide.org>,
> Andre Hedrick  <andre@linux-ide.org> wrote:
> >
> >Well that "experimental patch" is designed to get out of the dreaded
> >"DMA Timeout Hang" or deadlock that is most noted by the PIIX4 on the
> >Intel 440*X Chipset groups.  Since it appears that their bug was copied
> >but other chipset makers......you see the picture clearly, right?
> 
> No.

Oh, then I need to explain....but later.

> That experimental patch is _experimental_, and has not been reported by
> anybody to fix anything at all.  Also, the DMA timeout on PIIX4 seems to
> have nothing at all to do with the very silent corruption on VIA. At
> least nobody has reported any error messages being produced on the VIA
> corruption cases.

Yes corruption verses deadlock that can wack superblock....hummm
Two evils, mame or kill one or leave both active...

> In short, let's leave it out of a stable kernel for now, and add
> blacklisting of auto-DMA. Alan has a list. We can play around with
> trying to _fix_ DMA on the VIA chipsets in 2.5.x (and possibly backport
> the thing once it has been sufficiently battletested that people believe
> it truly will work).

Linus we are talking about blacklisting every PIIX4 that is 440BX/GX/LX/NX 
in this case and that is a major list.  VIA has its own problems and that
need special cases attention by one person work on always, thus the
poor^H^H^H^H bold sucker^H^H^H^H^H^H guy known as Vojtech Pavlik from SuSE
is having to much fun....

Cheers,

Andre Hedrick
Linux ATA Development


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