Re: PROBLEM REMAINS: [sata_nv ADMA breaks ATAPI] Crash on accessing DVD-RAM

[Robert Hancock <hancockr@shaw.ca>]

Alexander wrote:
> Hello!
> 
> The problem described at https://bugzilla.redhat.com/show_bug.cgi?id=351451 and
> at http://ubuntuforums.org/showthread.php?t=655772 and supposedly fixed by the
> patch http://kerneltrap.org/mailarchive/linux-kernel/2007/11/25/445094 is still
> there. I have compiled 2.6.24-rc7 kernel and booted my PC with it just to find
> out that my SATA DVD-RW is

There's this patch which was intended to fix it:

http://lkml.org/lkml/2007/11/22/148

which hasn't been merged yet. I see now that there was some further 
discussion from someone saying that didn't fix the problem for them, 
which I wasn't CCed on.. It looks like in their case, libata is 
receiving SGs with DMA addresses above 4GB even though the block layer 
bounce limit is set to 32-bit. That's the mechanism that sata_nv depends 
on to ensure that it gets proper addresses when accessing ATAPI devices 
where it is limited to 32-bit DMA.. Could that be breaking or 
insufficient somehow?

-- 
Robert Hancock      Saskatoon, SK, Canada
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