[PATCH] remove superflous BUG_ON's in nommu and gart

There's no need to check for invalid DMA data direction in nommu and
gart since we do it in dma-mapping.h anyway before calling the
individual dma-ops.
Signed-off-by: NMuli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: NAndi Kleen <ak@suse.de>

arch/x86_64/kernel/pci-gart.c

@@ -239,8 +239,6 @@ dma_addr_t gart_map_single(struct device *dev, void *addr, size_t size, int dir)
 {
 	unsigned long phys_mem, bus;
 
-	BUG_ON(dir == DMA_NONE);
-
 	if (!dev)
 		dev = &fallback_dev;
 
@@ -383,7 +381,6 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
 	unsigned long pages = 0;
 	int need = 0, nextneed;
 
-	BUG_ON(dir == DMA_NONE);
 	if (nents == 0) 
 		return 0;
 

arch/x86_64/kernel/pci-nommu.c

@@ -59,7 +59,6 @@ int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
 {
 	int i;
 
-	BUG_ON(direction == DMA_NONE);
  	for (i = 0; i < nents; i++ ) {
 		struct scatterlist *s = &sg[i];
 		BUG_ON(!s->page);