powerpc: Fix DMA offset for non-coherent DMA

After Becky's work we can almost have different DMA offsets
between on-chip devices and PCI. Almost because there's a
problem with the non-coherent DMA code that basically ignores
the programmed offset to use the global one for everything.
This fixes it.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 41fdd48bf43..1562daf8839 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -30,11 +30,15 @@ static unsigned long get_dma_direct_offset(struct device *dev)
 void *dma_direct_alloc_coherent(struct device *dev, size_t size,
                                 dma_addr_t *dma_handle, gfp_t flag)
 {
+        void *ret;
 #ifdef CONFIG_NOT_COHERENT_CACHE
-        return __dma_alloc_coherent(size, dma_handle, flag);
+        ret = __dma_alloc_coherent(size, dma_handle, flag);
+        if (ret == NULL)
+                return NULL;
+        *dma_handle += get_dma_direct_offset(dev);
+        return ret;
 #else
         struct page *page;
-        void *ret;
         int node = dev_to_node(dev);
 
         /* ignore region specifiers */