[POWERPC] Fix initialization and usage of dma_mask

powerpc has a couple of bugs in the usage of dma_masks that tend to
break when drivers explicitly try to set a 32-bit mask for example.

First, the code that generates the pci devices from the OF device-tree
doesn't initialize the mask properly, then our implementation of
set_dma_mask() was trying to validate the -previous- mask value, not the
one passed in as an argument.

This fixes these problems.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/asm-powerpc/dma-mapping.h b/include/asm-powerpc/dma-mapping.h
index f6bd804d9090..744d6bb24116 100644
--- a/include/asm-powerpc/dma-mapping.h
+++ b/include/asm-powerpc/dma-mapping.h
@@ -95,7 +95,7 @@ static inline int dma_set_mask(struct device *dev, u64 dma_mask)
                 return -EIO;
         if (dma_ops->set_dma_mask != NULL)
                 return dma_ops->set_dma_mask(dev, dma_mask);
-        if (!dev->dma_mask || !dma_supported(dev, *dev->dma_mask))
+        if (!dev->dma_mask || !dma_supported(dev, dma_mask))
                 return -EIO;
         *dev->dma_mask = dma_mask;
         return 0;