1 files changed, 21 insertions, 8 deletions

diff --git a/arch/avr32/mm/dma-coherent.c b/arch/avr32/mm/dma-coherent.c
index 44ab8a7bdae..50cdb5b10f0 100644
--- a/arch/avr32/mm/dma-coherent.c
+++ b/arch/avr32/mm/dma-coherent.c
@@ -7,11 +7,13 @@
  */
 
 #include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+#include <linux/export.h>
 
 #include <asm/addrspace.h>
 #include <asm/cacheflush.h>
 
-void dma_cache_sync(void *vaddr, size_t size, int direction)
+void dma_cache_sync(struct device *dev, void *vaddr, size_t size, int direction)
 {
 	/*
 	 * No need to sync an uncached area
@@ -21,13 +23,13 @@ void dma_cache_sync(void *vaddr, size_t size, int direction)
 
 	switch (direction) {
 	case DMA_FROM_DEVICE:		/* invalidate only */
-		dma_cache_inv(vaddr, size);
+		invalidate_dcache_region(vaddr, size);
 		break;
 	case DMA_TO_DEVICE:		/* writeback only */
-		dma_cache_wback(vaddr, size);
+		clean_dcache_region(vaddr, size);
 		break;
 	case DMA_BIDIRECTIONAL:		/* writeback and invalidate */
-		dma_cache_wback_inv(vaddr, size);
+		flush_dcache_region(vaddr, size);
 		break;
 	default:
 		BUG();
@@ -41,6 +43,13 @@ static struct page *__dma_alloc(struct device *dev, size_t size,
 	struct page *page, *free, *end;
 	int order;
 
+	/* Following is a work-around (a.k.a. hack) to prevent pages
+	 * with __GFP_COMP being passed to split_page() which cannot
+	 * handle them.  The real problem is that this flag probably
+	 * should be 0 on AVR32 as it is not supported on this
+	 * platform--see CONFIG_HUGETLB_PAGE. */
+	gfp &= ~(__GFP_COMP);
+
 	size = PAGE_ALIGN(size);
 	order = get_order(size);
 
@@ -112,16 +121,21 @@ void dma_free_coherent(struct device *dev, size_t size,
 }
 EXPORT_SYMBOL(dma_free_coherent);
 
-#if 0
 void *dma_alloc_writecombine(struct device *dev, size_t size,
 			     dma_addr_t *handle, gfp_t gfp)
 {
 	struct page *page;
+	dma_addr_t phys;
 
 	page = __dma_alloc(dev, size, handle, gfp);
+	if (!page)
+		return NULL;
+
+	phys = page_to_phys(page);
+	*handle = phys;
 
 	/* Now, map the page into P3 with write-combining turned on */
-	return __ioremap(page_to_phys(page), size, _PAGE_BUFFER);
+	return __ioremap(phys, size, _PAGE_BUFFER);
 }
 EXPORT_SYMBOL(dma_alloc_writecombine);
 
@@ -132,8 +146,7 @@ void dma_free_writecombine(struct device *dev, size_t size,
 
 	iounmap(cpu_addr);
 
-	page = bus_to_page(handle);
+	page = phys_to_page(handle);
 	__dma_free(dev, size, page, handle);
 }
 EXPORT_SYMBOL(dma_free_writecombine);
-#endif