parisc: ->mapping_error

DMA_ERROR_CODE already went away in linux-next, but parisc unfortunately
added a new instance of it without any review as far as I can tell.

Move the two iommu drivers to report errors through ->mapping_error.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/dma-mapping.h

@@ -20,8 +20,6 @@
 ** flush/purge and allocate "regular" cacheable pages for everything.
 */
 
-#define DMA_ERROR_CODE	(~(dma_addr_t)0)
-
 #ifdef CONFIG_PA11
 extern const struct dma_map_ops pcxl_dma_ops;
 extern const struct dma_map_ops pcx_dma_ops;

drivers/parisc/ccio-dma.c

@@ -110,6 +110,8 @@
 #define CMD_TLB_DIRECT_WRITE 35         /* IO_COMMAND for I/O TLB Writes     */
 #define CMD_TLB_PURGE        33         /* IO_COMMAND to Purge I/O TLB entry */
 
+#define CCIO_MAPPING_ERROR    (~(dma_addr_t)0)
+
 struct ioa_registers {
         /* Runway Supervisory Set */
         int32_t    unused1[12];
@@ -742,7 +744,7 @@ ccio_map_single(struct device *dev, void *addr, size_t size,
 	BUG_ON(!dev);
 	ioc = GET_IOC(dev);
 	if (!ioc)
-		return DMA_ERROR_CODE;
+		return CCIO_MAPPING_ERROR;
 
 	BUG_ON(size <= 0);
 
@@ -1023,6 +1025,11 @@ ccio_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
 	DBG_RUN_SG("%s() DONE (nents %d)\n", __func__, nents);
 }
 
+static int ccio_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return dma_addr == CCIO_MAPPING_ERROR;
+}
+
 static const struct dma_map_ops ccio_ops = {
 	.dma_supported =	ccio_dma_supported,
 	.alloc =		ccio_alloc,
@@ -1031,6 +1038,7 @@ static const struct dma_map_ops ccio_ops = {
 	.unmap_page =		ccio_unmap_page,
 	.map_sg = 		ccio_map_sg,
 	.unmap_sg = 		ccio_unmap_sg,
+	.mapping_error =	ccio_mapping_error,
 };
 
 #ifdef CONFIG_PROC_FS

drivers/parisc/sba_iommu.c

@@ -93,6 +93,8 @@
 
 #define DEFAULT_DMA_HINT_REG	0
 
+#define SBA_MAPPING_ERROR    (~(dma_addr_t)0)
+
 struct sba_device *sba_list;
 EXPORT_SYMBOL_GPL(sba_list);
 
@@ -725,7 +727,7 @@ sba_map_single(struct device *dev, void *addr, size_t size,
 
 	ioc = GET_IOC(dev);
 	if (!ioc)
-		return DMA_ERROR_CODE;
+		return SBA_MAPPING_ERROR;
 
 	/* save offset bits */
 	offset = ((dma_addr_t) (long) addr) & ~IOVP_MASK;
@@ -1083,6 +1085,11 @@ sba_unmap_sg(struct device *dev, struct scatterlist *sglist, int nents,
 
 }
 
+static int sba_mapping_error(struct device *dev, dma_addr_t dma_addr)
+{
+	return dma_addr == SBA_MAPPING_ERROR;
+}
+
 static const struct dma_map_ops sba_ops = {
 	.dma_supported =	sba_dma_supported,
 	.alloc =		sba_alloc,
@@ -1091,6 +1098,7 @@ static const struct dma_map_ops sba_ops = {
 	.unmap_page =		sba_unmap_page,
 	.map_sg =		sba_map_sg,
 	.unmap_sg =		sba_unmap_sg,
+	.mapping_error =	sba_mapping_error,
 };