Re: [PATCH] linux-2.5.7.fix2.patch

Andre Hedrick (
Wed, 27 Mar 2002 12:06:42 -0800 (PST)


That means something else has changed beyound the code base because that
is almost a copy of what runs perfect in 2.4.

Lemme look again.


On Wed, 27 Mar 2002, Anton Altaparmakov wrote:

> Hi Andre,
> I tried this patch on my laptop to see if it would make my atapi cdrom data
> underrun problems go away.
> Unfortunately booting 2.5.7 + your patch causes hda: lost interrupt
> messages to appear. It still manages to progress through the boot scripts
> ok for a while, albeit very, very slowly, but eventually after several lost
> interrupt messages the kernel crashes.
> Vanilla 2.5.7 boots fine but the cdrom doesn't work due to the data/buffer
> underruns...
> I am quite happy to help debug this, let me know what info you would like
> to see... Can I enable debugging somewhere to get more interesting messages
> or should I try anything?
> Cheers,
> Anton
> At 22:53 23/03/02, Andre Hedrick wrote:
> >Martin et al.
> >
> >This is the next step in stablizing the transport layer.
> >I have not booted but it will compile, and it is nearly identical to what
> >I generated for 2.4 to be released soon.
> >
> >The comments are harsh on the interface but it functionally correct.
> >If you get an device error in PIO, bad things can happen to the data.
> >This is no different in the stock 2.4.0->2.4.18->19x.
> >
> >Of of all the transport data handlers.
> >
> >CLEAN and SAFE:
> > DMA read/write is safe and has always been.
> > Single sector PIO WRITING is clean and safe.
> >
> >DIRTY but operational (error events in the hardware will cause data problems)
> > Single sector PIO READING can corrupt a single sector if there
> > is a device error.
> > Multi-Read/Write will corrupt and misreport data only on an error.
> >
> >What is still lacking in block is the much needed in proccess bio walker.
> >Once I can finish coding this fix into BLOCK, then I can complete the
> >transport layer and slap it on a bus analyzer and force articial errors on
> >the buss to see if the driver behaves correctly. If this passes, we are
> >good to run like the wind.
> >
> >Regards,
> >
> >Andre Hedrick
> >LAD Storage Consulting Group
> --
> "I've not lost my mind. It's backed up on tape somewhere." - Unknown
> --
> Anton Altaparmakov <aia21 at> (replace at with @)
> Linux NTFS Maintainer / WWW:
> ICQ: 8561279 / WWW:

Andre Hedrick
LAD Storage Consulting Group

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