[PATCH] powerpc: Fix initialization and usage of dma_mask

[Olaf Hering]

On Tue, Aug 07, Benjamin Herrenschmidt wrote:

> powerpc has a couple of bugs in the usage of dma_masks that tend to
> break when drivers explicitely try to set a 32 bits 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 patch should fix these.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> ---
> 
> Does this fix the problem you've noticed ?

This patch fixes it. Thanks.