sparc64/pci_sun4v: fix ATU checks for large DMA masks
Now that we allow drivers to always need to set larger than required DMA masks we need to be a little more careful in the sun4v PCI iommu driver to chose when to select the ATU support - a larger DMA mask can be set even when the platform does not support ATU, so we always have to check if it is avaiable before using it. Add a little helper for that and use it in all the places where we make ATU usage decisions based on the DMA mask. Fixes: 24132a41 ("sparc64/pci_sun4v: allow large DMA masks") Reported-by:Meelis Roos <mroos@linux.ee> Signed-off-by:
Christoph Hellwig <hch@lst.de> Tested-by:
Meelis Roos <mroos@linux.ee> Acked-by:
David S. Miller <davem@davemloft.net>
parent
15ade5d2
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