[SCSI] zfcp: 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>
Acked-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

drivers/s390/scsi/zfcp_fsf.c

@@ -4154,8 +4154,9 @@ zfcp_fsf_send_fcp_command_task_handler(struct zfcp_fsf_req *fsf_req)
 			      fcp_rsp_iu->fcp_resid,
 			      (int) zfcp_get_fcp_dl(fcp_cmnd_iu));
 
-		scpnt->resid = fcp_rsp_iu->fcp_resid;
-		if (scpnt->request_bufflen - scpnt->resid < scpnt->underflow)
+		scsi_set_resid(scpnt, fcp_rsp_iu->fcp_resid);
+		if (scsi_bufflen(scpnt) - scsi_get_resid(scpnt) <
+		    scpnt->underflow)
 			set_host_byte(&scpnt->result, DID_ERROR);
 	}
 

drivers/s390/scsi/zfcp_qdio.c

@@ -36,8 +36,6 @@ static void zfcp_qdio_sbale_fill
 	(struct zfcp_fsf_req *, unsigned long, void *, int);
 static int zfcp_qdio_sbals_from_segment
 	(struct zfcp_fsf_req *, unsigned long, void *, unsigned long);
-static int zfcp_qdio_sbals_from_buffer
-	(struct zfcp_fsf_req *, unsigned long, void *, unsigned long, int);
 
 static qdio_handler_t zfcp_qdio_request_handler;
 static qdio_handler_t zfcp_qdio_response_handler;
@@ -631,28 +629,6 @@ zfcp_qdio_sbals_from_sg(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
 }
 
 
-/**
- * zfcp_qdio_sbals_from_buffer - fill SBALs from buffer
- * @fsf_req: request to be processed
- * @sbtype: SBALE flags
- * @buffer: data buffer
- * @length: length of buffer
- * @max_sbals: upper bound for number of SBALs to be used
- */
-static int
-zfcp_qdio_sbals_from_buffer(struct zfcp_fsf_req *fsf_req, unsigned long sbtype,
-			    void *buffer, unsigned long length, int max_sbals)
-{
-	struct scatterlist sg_segment;
-
-	zfcp_address_to_sg(buffer, &sg_segment);
-	sg_segment.length = length;
-
-	return zfcp_qdio_sbals_from_sg(fsf_req, sbtype, &sg_segment, 1,
-                                       max_sbals);
-}
-
-
 /**
  * zfcp_qdio_sbals_from_scsicmnd - fill SBALs from scsi command
  * @fsf_req: request to be processed
@@ -664,18 +640,13 @@ int
 zfcp_qdio_sbals_from_scsicmnd(struct zfcp_fsf_req *fsf_req,
 			      unsigned long sbtype, struct scsi_cmnd *scsi_cmnd)
 {
-	if (scsi_cmnd->use_sg) {
+	if (scsi_sg_count(scsi_cmnd))
 		return zfcp_qdio_sbals_from_sg(fsf_req,	sbtype,
-                                               (struct scatterlist *)
-                                               scsi_cmnd->request_buffer,
-                                               scsi_cmnd->use_sg,
-                                               ZFCP_MAX_SBALS_PER_REQ);
-	} else {
-                return zfcp_qdio_sbals_from_buffer(fsf_req, sbtype,
-                                                   scsi_cmnd->request_buffer,
-                                                   scsi_cmnd->request_bufflen,
-                                                   ZFCP_MAX_SBALS_PER_REQ);
-	}
+					       scsi_sglist(scsi_cmnd),
+					       scsi_sg_count(scsi_cmnd),
+					       ZFCP_MAX_SBALS_PER_REQ);
+	else
+		return 0;
 }
 
 /**