[PATCH] Use valid_dma_direction() in include/asm-i386/dma-mapping.h

Now that the generic DMA code has a function to decide if a given DMA
mapping is valid use it.  This will catch cases where direction is not any
of the defined enum values but some random number outside the valid range.
The current implementation will only catch the defined but invalid case
DMA_NONE.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Acked-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-i386/dma-mapping.h

@@ -21,7 +21,7 @@ static inline dma_addr_t
 dma_map_single(struct device *dev, void *ptr, size_t size,
 	       enum dma_data_direction direction)
 {
-	BUG_ON(direction == DMA_NONE);
+	BUG_ON(!valid_dma_direction(direction));
 	WARN_ON(size == 0);
 	flush_write_buffers();
 	return virt_to_phys(ptr);
@@ -31,7 +31,7 @@ static inline void
 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
 		 enum dma_data_direction direction)
 {
-	BUG_ON(direction == DMA_NONE);
+	BUG_ON(!valid_dma_direction(direction));
 }
 
 static inline int
@@ -40,7 +40,7 @@ dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 {
 	int i;
 
-	BUG_ON(direction == DMA_NONE);
+	BUG_ON(!valid_dma_direction(direction));
 	WARN_ON(nents == 0 || sg[0].length == 0);
 
 	for (i = 0; i < nents; i++ ) {
@@ -57,23 +57,23 @@ static inline dma_addr_t
 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
 	     size_t size, enum dma_data_direction direction)
 {
-	BUG_ON(direction == DMA_NONE);
+	BUG_ON(!valid_dma_direction(direction));
 	return page_to_phys(page) + offset;
 }
 
 static inline void
 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
 	       enum dma_data_direction direction)
 {
-	BUG_ON(direction == DMA_NONE);
+	BUG_ON(!valid_dma_direction(direction));
 }
 
 
 static inline void
 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
 	     enum dma_data_direction direction)
 {
-	BUG_ON(direction == DMA_NONE);
+	BUG_ON(!valid_dma_direction(direction));
 }
 
 static inline void