mips/jazz: remove the mapping_error dma_map_ops method

The Jazz iommu code already returns (~(dma_addr_t)0x0) on mapping
failures, so we can switch over to returning DMA_MAPPING_ERROR and
let the core dma-mapping code handle the rest.

Signed-off-by: Christoph Hellwig <[e-mail]>
Acked-by: Linus Torvalds <[e-mail]>

arch/mips/include/asm/jazzdma.h

···
 #define VDMA_OFFSET(a)		((unsigned int)(a) & (VDMA_PAGESIZE-1))
 
 /*
- * error code returned by vdma_alloc()
- * (See also arch/mips/kernel/jazzdma.c)
- */
-#define VDMA_ERROR		0xffffffff
-
-/*
  * VDMA pagetable entry description
  */
 typedef volatile struct VDMA_PGTBL_ENTRY {

arch/mips/jazz/jazzdma.c

···
 		if (vdma_debug)
 			printk("vdma_alloc: Invalid physical address: %08lx\n",
 			       paddr);
-		return VDMA_ERROR;	/* invalid physical address */
+		return DMA_MAPPING_ERROR;	/* invalid physical address */
 	}
 	if (size > 0x400000 || size == 0) {
 		if (vdma_debug)
 			printk("vdma_alloc: Invalid size: %08lx\n", size);
-		return VDMA_ERROR;	/* invalid physical address */
+		return DMA_MAPPING_ERROR;	/* invalid physical address */
 	}
 
 	spin_lock_irqsave(&vdma_lock, flags);
···
 		       first < VDMA_PGTBL_ENTRIES) first++;
 		if (first + pages > VDMA_PGTBL_ENTRIES) {	/* nothing free */
 			spin_unlock_irqrestore(&vdma_lock, flags);
-			return VDMA_ERROR;
+			return DMA_MAPPING_ERROR;
 		}
 
 		last = first + 1;
···
 		return NULL;
 
 	*dma_handle = vdma_alloc(virt_to_phys(ret), size);
-	if (*dma_handle == VDMA_ERROR) {
+	if (*dma_handle == DMA_MAPPING_ERROR) {
 		dma_direct_free_pages(dev, size, ret, *dma_handle, attrs);
 		return NULL;
 	}
···
 			arch_sync_dma_for_device(dev, sg_phys(sg), sg->length,
 				dir);
 		sg->dma_address = vdma_alloc(sg_phys(sg), sg->length);
-		if (sg->dma_address == VDMA_ERROR)
+		if (sg->dma_address == DMA_MAPPING_ERROR)
 			return 0;
 		sg_dma_len(sg) = sg->length;
 	}
···
 		arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir);
 }
 
-static int jazz_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
-	return dma_addr == VDMA_ERROR;
-}
-
 const struct dma_map_ops jazz_dma_ops = {
 	.alloc			= jazz_dma_alloc,
 	.free			= jazz_dma_free,
···
 	.sync_sg_for_device	= jazz_dma_sync_sg_for_device,
 	.dma_supported		= dma_direct_supported,
 	.cache_sync		= arch_dma_cache_sync,
-	.mapping_error		= jazz_dma_mapping_error,
 };
 EXPORT_SYMBOL(jazz_dma_ops);