SPARC64: Fix sun4v DMA panic

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64bit DMA only supported on sun4v equipped with ATU IOMMU HW.
'Commit b02c2b0bfd ("sparc: remove arch specific dma_supported
implementations")' introduced a code that incorrectly allow
dma_supported() to succeed for 64bit dma mask even if system doesn't
have ATU IOMMU. This results into panic.

Fix it.

Reported-by: Meelis Roos <mroos@linux.ee>
Signed-off-by: Tushar Dave <tushar.n.dave@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Tushar Dave 2017-07-11 14:34:47 -07:00 • committed by David S. Miller

parent 3b06b1a744

commit 2ad67141f1

1 changed files with 7 additions and 5 deletions

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arch/sparc/kernel/pci_sun4v.c

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