[SCSI] BusLogic: 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.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/BusLogic.c

@@ -304,16 +304,8 @@ static struct BusLogic_CCB *BusLogic_AllocateCCB(struct BusLogic_HostAdapter
 static void BusLogic_DeallocateCCB(struct BusLogic_CCB *CCB)
 {
 	struct BusLogic_HostAdapter *HostAdapter = CCB->HostAdapter;
-	struct scsi_cmnd *cmd = CCB->Command;
 
-	if (cmd->use_sg != 0) {
-		pci_unmap_sg(HostAdapter->PCI_Device,
-				(struct scatterlist *)cmd->request_buffer,
-				cmd->use_sg, cmd->sc_data_direction);
-	} else if (cmd->request_bufflen != 0) {
-		pci_unmap_single(HostAdapter->PCI_Device, CCB->DataPointer,
-				CCB->DataLength, cmd->sc_data_direction);
-	}
+	scsi_dma_unmap(CCB->Command);
 	pci_unmap_single(HostAdapter->PCI_Device, CCB->SenseDataPointer,
 			 CCB->SenseDataLength, PCI_DMA_FROMDEVICE);
 
@@ -2648,7 +2640,8 @@ static void BusLogic_ProcessCompletedCCBs(struct BusLogic_HostAdapter *HostAdapt
 			 */
 			if (CCB->CDB[0] == INQUIRY && CCB->CDB[1] == 0 && CCB->HostAdapterStatus == BusLogic_CommandCompletedNormally) {
 				struct BusLogic_TargetFlags *TargetFlags = &HostAdapter->TargetFlags[CCB->TargetID];
-				struct SCSI_Inquiry *InquiryResult = (struct SCSI_Inquiry *) Command->request_buffer;
+				struct SCSI_Inquiry *InquiryResult =
+					(struct SCSI_Inquiry *) scsi_sglist(Command);
 				TargetFlags->TargetExists = true;
 				TargetFlags->TaggedQueuingSupported = InquiryResult->CmdQue;
 				TargetFlags->WideTransfersSupported = InquiryResult->WBus16;
@@ -2819,9 +2812,8 @@ static int BusLogic_QueueCommand(struct scsi_cmnd *Command, void (*CompletionRou
 	int CDB_Length = Command->cmd_len;
 	int TargetID = Command->device->id;
 	int LogicalUnit = Command->device->lun;
-	void *BufferPointer = Command->request_buffer;
-	int BufferLength = Command->request_bufflen;
-	int SegmentCount = Command->use_sg;
+	int BufferLength = scsi_bufflen(Command);
+	int Count;
 	struct BusLogic_CCB *CCB;
 	/*
 	   SCSI REQUEST_SENSE commands will be executed automatically by the Host
@@ -2851,36 +2843,35 @@ static int BusLogic_QueueCommand(struct scsi_cmnd *Command, void (*CompletionRou
 			return 0;
 		}
 	}
+
 	/*
 	   Initialize the fields in the BusLogic Command Control Block (CCB).
 	 */
-	if (SegmentCount == 0 && BufferLength != 0) {
-		CCB->Opcode = BusLogic_InitiatorCCB;
-		CCB->DataLength = BufferLength;
-		CCB->DataPointer = pci_map_single(HostAdapter->PCI_Device,
-				BufferPointer, BufferLength,
-				Command->sc_data_direction);
-	} else if (SegmentCount != 0) {
-		struct scatterlist *ScatterList = (struct scatterlist *) BufferPointer;
-		int Segment, Count;
-
-		Count = pci_map_sg(HostAdapter->PCI_Device, ScatterList, SegmentCount,
-				Command->sc_data_direction);
+	Count = scsi_dma_map(Command);
+	BUG_ON(Count < 0);
+	if (Count) {
+		struct scatterlist *sg;
+		int i;
+
 		CCB->Opcode = BusLogic_InitiatorCCB_ScatterGather;
 		CCB->DataLength = Count * sizeof(struct BusLogic_ScatterGatherSegment);
 		if (BusLogic_MultiMasterHostAdapterP(HostAdapter))
 			CCB->DataPointer = (unsigned int) CCB->DMA_Handle + ((unsigned long) &CCB->ScatterGatherList - (unsigned long) CCB);
 		else
 			CCB->DataPointer = Virtual_to_32Bit_Virtual(CCB->ScatterGatherList);
-		for (Segment = 0; Segment < Count; Segment++) {
-			CCB->ScatterGatherList[Segment].SegmentByteCount = sg_dma_len(ScatterList + Segment);
-			CCB->ScatterGatherList[Segment].SegmentDataPointer = sg_dma_address(ScatterList + Segment);
+
+		scsi_for_each_sg(Command, sg, Count, i) {
+			CCB->ScatterGatherList[i].SegmentByteCount =
+				sg_dma_len(sg);
+			CCB->ScatterGatherList[i].SegmentDataPointer =
+				sg_dma_address(sg);
 		}
-	} else {
+	} else if (!Count) {
 		CCB->Opcode = BusLogic_InitiatorCCB;
 		CCB->DataLength = BufferLength;
 		CCB->DataPointer = 0;
 	}
+
 	switch (CDB[0]) {
 	case READ_6:
 	case READ_10: