> On Sun, Aug 05, Stefan Richter wrote:
>
> > Benjamin Herrenschmidt wrote:
> > >>> If setting 32-bit DMA mask fails on ppc64, that sounds like a problem
> > >>> with the DMA implementation on that architecture. There are enough cards
> > >>> out there that only support 32-bit DMA that this really needs to work..
> > >> Yes, could the PPC folks please have a look at it? Thanks.
> > >
> > > Smells like we may have a bug there. No worries though, all current PPC
> > > machines have an iommu that will not give out addresses above 32 bits
> > > anyway, but I'll double check what's up.
> > >
> > > Do you see something in dmesg when that happens ?
> >
> > There was nothing in Olaf's report, except for trouble in sbp2 _after_
> > the failure.
http://lkml.org/lkml/2007/8/1/344 (I don't have a PMac.)
>
> sbp2util_remove_command_orb_pool() does not check for lu->hi being NULL.
>
> dev->dma_mask is NULL too, thats why dma_direct_dma_supported() returns
> false, and dma_set_mask() will return -EIO.
