[PATCH 03/15] ppc64 iommu: fix check for direct DMA support

[Nishanth Aravamudan]

The current check is wrong because it does not take the DMA offset intot
account, and in the case of a driver which doesn't actually support
64bits would falsely report that device as working.

Signed-off-by: Milton Miller <miltonm at bga.com>
Signed-off-by: Nishanth Aravamudan <nacc at us.ibm.com>
---
 arch/powerpc/kernel/dma.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 84d6367..494ab12 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -89,7 +89,7 @@ static int dma_direct_dma_supported(struct device *dev, u64 mask)
 	/* Could be improved so platforms can set the limit in case
 	 * they have limited DMA windows
 	 */
-	return mask >= (memblock_end_of_DRAM() - 1);
+	return mask >= get_dma_offset(dev) + (memblock_end_of_DRAM() - 1);
 #else
 	return 1;
 #endif
-- 
1.7.0.4