On Tue, 16 Jan 2007 17:45:56 -0500
Jeff Garzik <[EMAIL PROTECTED]> wrote:

> Alan wrote:
> >> The other oddity I've been seeing is that I am getting zero length 
> >> commands,
> >> such as TEST_UNIT_READY with a dma_dir of DMA_FROM_DEVICE. Shouldn't this 
> >> be
> >> DMA_NONE? I'm still tracking this down.
> > 
> > I was looking at a PATA trace that was looking the same 2 days ago and
> > couldn't figure what was going on. 
> 
> Tejun recently updated the CDB length areas of the code.  I bet it's 
> either a bug somewhere in there, or the SCSI layer isn't passing us 
> proper command lengths in a case or two.

That might explain a few things - the qemu PIIX3 emulation bug possibly
and also perhaps the recent NVidia iommu fun.

Alan
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