isci: move stp request info to scic_sds_request

In preparation for unifying allocation of all request information make stp
data available in all requests.  Incidentally collapse indentation.
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/core/scic_sds_request.c

@@ -710,8 +710,7 @@ enum sci_status scic_io_request_construct_basic_sata(
 	struct isci_request *isci_request = sci_req->ireq;
 	struct sas_task *task = isci_request_access_task(isci_request);
 
-	stp_req = container_of(sci_req, typeof(*stp_req), parent);
-
+	stp_req = &sci_req->stp.req;
 	sci_req->protocol = SCIC_STP_PROTOCOL;
 
 	copy = (task->data_dir == DMA_NONE) ? false : true;

drivers/scsi/isci/core/scic_sds_request.h

@@ -56,16 +56,10 @@
 #ifndef _SCIC_SDS_IO_REQUEST_H_
 #define _SCIC_SDS_IO_REQUEST_H_
 
-/**
- * This file contains the structures, constants and prototypes for the
- *    SCIC_SDS_IO_REQUEST object.
- *
- *
- */
-
 #include "scic_io_request.h"
 #include "sci_base_state_machine.h"
 #include "scu_task_context.h"
+#include "scic_sds_stp_request.h"
 
 struct scic_sds_controller;
 struct scic_sds_remote_device;
@@ -233,8 +227,19 @@ struct scic_sds_request {
 	 */
 	u8 device_sequence;
 
+	struct {
+		struct scic_sds_stp_request req;
+	} stp;
 };
 
+static inline struct scic_sds_request *to_sci_req(struct scic_sds_stp_request *stp_req)
+{
+	struct scic_sds_request *sci_req;
+
+	sci_req = container_of(stp_req, typeof(*sci_req), stp.req);
+	return sci_req;
+}
+
 /**
  * enum sci_base_request_states - This enumeration depicts all the states for
  *    the common request state machine.

drivers/scsi/isci/core/scic_sds_stp_request.h

@@ -58,17 +58,8 @@
 
 #include <linux/dma-mapping.h>
 #include <scsi/sas.h>
-#include "scic_sds_request.h"
 
-/**
- * This structure represents the additional information that is required to
- *    handle SATA PIO requests.
- *
- *
- */
 struct scic_sds_stp_request {
-	struct scic_sds_request parent;
-
 	struct dev_to_host_fis d2h_reg_fis;
 
 	union {
@@ -125,7 +116,6 @@ struct scic_sds_stp_request {
 			u32 device_preferred_cdb_length;
 		} packet;
 	} type;
-
 };
 
 /**

drivers/scsi/isci/task.c

@@ -64,7 +64,7 @@
 #include "request.h"
 #include "sata.h"
 #include "task.h"
-#include "scic_sds_stp_request.h"
+#include "scic_sds_request.h"
 
 /**
 * isci_task_refuse() - complete the request to the upper layer driver in
@@ -1435,8 +1435,7 @@ isci_task_request_complete(struct isci_host *ihost,
 	struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 	struct completion *tmf_complete;
 	struct scic_sds_request *sci_req = ireq->sci_request_handle;
-	struct scic_sds_stp_request *stp_req =
-		container_of(sci_req, typeof(*stp_req), parent);
+	struct scic_sds_stp_request *stp_req = &sci_req->stp.req;
 
 	dev_dbg(&ihost->pdev->dev,
 		"%s: request = %p, status=%d\n",