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powerpc/dma: Fix check for direct DMA support 

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@bga.com>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Nishanth Aravamudan 2010-09-15 08:05:46 +00:00 committed by Benjamin Herrenschmidt
parent 1cb8e85a9d
commit ffa56e555a
1 changed files with 1 additions and 1 deletions
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arch/powerpc/kernel/dma.c
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@ -90,7 +90,7 @@ static int dma_direct_dma_supported(struct device *dev, u64 mask)
/* Could be improved so platforms can set the limit in case /* Could be improved so platforms can set the limit in case
* they have limited DMA windows * they have limited DMA windows
*/ */
return mask >= (memblock_end_of_DRAM() - 1); return mask >= get_dma_offset(dev) + (memblock_end_of_DRAM() - 1);
#else #else
return 1; return 1;
#endif #endif