From: Zygo Blaxell <uixjjji1@umail.furryterror.org>
Subject: 2.4.21 IDE and IEEE1394+SBP2 regressions, orinoco_pci progress
Date: Tue, 08 Jul 2003 22:49:26 -0400
Organization: Furry Cats and Hungry Terrors
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Previously on kernels up to 2.4.20, an IDE disk I/O request that was in
progress at suspend time would trigger a DMA reset upon resume, after a
short delay while waiting for the timeout.  2.4.20 looked like this:

        ide_dmaproc: chipset supported ide_dma_lostirq func only: 13 hda:
        lost interrupt

After this, the machine happily resumes whatever it was doing.  There is a
delay of a few seconds while this happens.

Now in 2.4.21, the kernel prints the following message:

        hda: dma_timer_expiry: dma status == 0x04

and that's the last thing it ever does--the kernel locks up hard.

Note that in order to see this you need to be doing a lot of I/O at
suspend time, e.g. 'cp -a /usr /tmp' or some such thing.

Also in 2.4.21, a filesystem mounted from a CD-ROM via ide-scsi will start
to get I/O errors if it is accessed during the suspend/resume sequence. 
In 2.4.20, there were no ill effects when this happens.


The IEEE1394+SBP2 driver combination in 2.4.21 has problems.  When the
kernel is compiled for single-processor the SBP2 driver can't log into my
SBP2 devices and hangs rmmod when the module is removed--in other words,
it's useless.  When compiled for SMP, the SBP2 driver works more or less
normally, but still requires an IEEE1394 bus reset to work the second time
a device is attached.  Note this is a laptop, so it only has one
processor.

2.4.20 has no such problems with my IEEE1394 SBP2 device--no bus resets
needed, no compile-option-dependent bugs, and it logs in and out of the
device without problems.


On a positive note, the orinoco_pci driver in 2.4.21 is the best driver
I've used for this chipset so far.  It's a vast improvement over the same
driver in 2.4.20, which would hang after about 30 seconds.  2.4.21's
driver is even slightly faster than the linux-wlan-ng driver.


The hardware in question is an IBM Thinkpad A30p with an S.400 port and
builtin Prism2.5 chipset.  The SBP2 device is a "Prolific PL3507 Combo
Device" (IOGear ION external IDE disk enclosure).  Kernel was compiled
with gcc 2.95.4 on Debian.

Further details available on request.
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