[SCSI] 53c700: convert to use the data buffer accessors

- remove the unnecessary map_single path.

- convert to use the new accessors for the sg lists and the
parameters.

Jens Axboe <jens.axboe@oracle.com> did the for_each_sg cleanup.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/53c700.c

@@ -585,16 +585,8 @@ NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
 	      struct NCR_700_command_slot *slot)
 {
 	if(SCp->sc_data_direction != DMA_NONE &&
-	   SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
-		if(SCp->use_sg) {
-			dma_unmap_sg(hostdata->dev, SCp->request_buffer,
-				     SCp->use_sg, SCp->sc_data_direction);
-		} else {
-			dma_unmap_single(hostdata->dev, slot->dma_handle,
-					 SCp->request_bufflen,
-					 SCp->sc_data_direction);
-		}
-	}
+	   SCp->sc_data_direction != DMA_BIDIRECTIONAL)
+		scsi_dma_unmap(SCp);
 }
 
 STATIC inline void
@@ -1263,12 +1255,11 @@ process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
 		       host->host_no, pun, lun, NCR_700_condition[i],
 		       NCR_700_phase[j], dsp - hostdata->pScript);
 		if(SCp != NULL) {
-			scsi_print_command(SCp);
+			struct scatterlist *sg;
 
-			if(SCp->use_sg) {
-				for(i = 0; i < SCp->use_sg + 1; i++) {
-					printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
-				}
+			scsi_print_command(SCp);
+			scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
+				printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
 			}
 		}
 		NCR_700_internal_bus_reset(host);
@@ -1844,8 +1835,8 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
 	}
 	/* sanity check: some of the commands generated by the mid-layer
 	 * have an eccentric idea of their sc_data_direction */
-	if(!SCp->use_sg && !SCp->request_bufflen 
-	   && SCp->sc_data_direction != DMA_NONE) {
+	if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
+	   SCp->sc_data_direction != DMA_NONE) {
 #ifdef NCR_700_DEBUG
 		printk("53c700: Command");
 		scsi_print_command(SCp);
@@ -1887,31 +1878,15 @@ NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
 		int i;
 		int sg_count;
 		dma_addr_t vPtr = 0;
+		struct scatterlist *sg;
 		__u32 count = 0;
 
-		if(SCp->use_sg) {
-			sg_count = dma_map_sg(hostdata->dev,
-					      SCp->request_buffer, SCp->use_sg,
-					      direction);
-		} else {
-			vPtr = dma_map_single(hostdata->dev,
-					      SCp->request_buffer, 
-					      SCp->request_bufflen,
-					      direction);
-			count = SCp->request_bufflen;
-			slot->dma_handle = vPtr;
-			sg_count = 1;
-		}
-			
+		sg_count = scsi_dma_map(SCp);
+		BUG_ON(sg_count < 0);
 
-		for(i = 0; i < sg_count; i++) {
-
-			if(SCp->use_sg) {
-				struct scatterlist *sg = SCp->request_buffer;
-
-				vPtr = sg_dma_address(&sg[i]);
-				count = sg_dma_len(&sg[i]);
-			}
+		scsi_for_each_sg(SCp, sg, sg_count, i) {
+			vPtr = sg_dma_address(sg);
+			count = sg_dma_len(sg);
 
 			slot->SG[i].ins = bS_to_host(move_ins | count);
 			DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",