[PATCH] Stop pci_set_dma_mask() from failing when RAM doesn't exceed the mask anyway

David Woodhouse dwmw2 at infradead.org
Sat Aug 1 17:54:45 EST 2009

On Sat, 2009-08-01 at 08:25 +1000, Benjamin Herrenschmidt wrote:
> On Fri, 2009-07-31 at 20:41 +0100, David Woodhouse wrote:
> > On an iMac G5, the b43 driver is failing to initialise because trying to
> > set the dma mask to 30-bit fails. Even though there's only 512MiB of RAM
> > in the machine anyway:
> > 	https://bugzilla.redhat.com/show_bug.cgi?id=514787
> > 
> > We should probably let it succeed if the available RAM in the system
> > doesn't exceed the requested limit.
> > 
> > Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
> Also, isn't our iommu code smart enough to clamp allocations to the DMA
> mask nowadays ? In that case, we could probably just force iommu on
> always...

We're not using the IOMMU on this box:

PowerMac motherboard: iMac G5
DART: table not allocated, using direct DMA

David Woodhouse                            Open Source Technology Centre
David.Woodhouse at intel.com                              Intel Corporation

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