staging: unisys: include: fix improper use of dma_data_direction

Replace use of standard Linux dma_data_direction with a Unisys-
specific uis_dma_data_direction and provide a function to convert
from the latter to the former.  This is necessary because Unisys
s-Par depends on the exact format of this field in multiple OSs
and languages, and so using the standard version creates an
unnecessary dependency between the kernel and s-Par.
Signed-off-by: Steven Matthews <steven.matthews@unisys.com>
Signed-off-by: David Kershner <david.kershner@unisys.com>
Reviewed-by: Tim Sell <timothy.sell@unisys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/unisys/include/iochannel.h

@@ -28,7 +28,7 @@
  */
 
 #include <linux/uuid.h>
-#include <linux/dma-direction.h>
+
 #include "channel.h"
 
 /*
@@ -60,6 +60,15 @@
 
 /* Size of cdb - i.e., SCSI cmnd */
 #define MAX_CMND_SIZE 16
+
+/* Unisys-specific DMA direction values */
+enum uis_dma_data_direction {
+	UIS_DMA_BIDIRECTIONAL = 0,
+	UIS_DMA_TO_DEVICE = 1,
+	UIS_DMA_FROM_DEVICE = 2,
+	UIS_DMA_NONE = 3
+};
+
 #define MAX_SENSE_SIZE 64
 #define MAX_PHYS_INFO 64
 
@@ -182,7 +191,7 @@ struct vhba_config_max {
  * @bufflen:		Length of data to be transferred out or in.
  * @guest_phys_entries:	Number of entries in scatter-gather list.
  * @struct gpi_list:	Physical address information for each fragment.
- * @enum data_dir:	Direction of the data, if any.
+ * @data_dir:		Direction of the data, if any.
  * @struct vdest:	Identifies the virtual hba, id, channel, lun to which
  *			cmd was sent.
  * @linuxstat:		Original Linux status used by Linux vdisk.
@@ -205,7 +214,7 @@ struct uiscmdrsp_scsi {
 	u32 bufflen;
 	u16 guest_phys_entries;
 	struct guest_phys_info gpi_list[MAX_PHYS_INFO];
-	enum dma_data_direction data_dir;
+	u32 data_dir;
 	struct uisscsi_dest vdest;
 	/* Needed to queue the rsp back to cmd originator. */
 	int linuxstat;

drivers/staging/unisys/visorhba/visorhba_main.c

@@ -477,6 +477,29 @@ static const char *visorhba_get_info(struct Scsi_Host *shp)
 	return "visorhba";
 }
 
+/*
+ * dma_data_dir_linux_to_spar - convert dma_data_direction value to
+ *				Unisys-specific equivalent
+ * @d: dma direction value to convert
+ *
+ * Returns the Unisys-specific dma direction value corresponding to @d
+ */
+static u32 dma_data_dir_linux_to_spar(enum dma_data_direction d)
+{
+	switch (d) {
+	case DMA_BIDIRECTIONAL:
+		return UIS_DMA_BIDIRECTIONAL;
+	case DMA_TO_DEVICE:
+		return UIS_DMA_TO_DEVICE;
+	case DMA_FROM_DEVICE:
+		return UIS_DMA_FROM_DEVICE;
+	case DMA_NONE:
+		return UIS_DMA_NONE;
+	default:
+		return UIS_DMA_NONE;
+	}
+}
+
 /*
  * visorhba_queue_command_lck - Queues command to the Service Partition
  * @scsicmd:		Command to be queued
@@ -525,7 +548,8 @@ static int visorhba_queue_command_lck(struct scsi_cmnd *scsicmd,
 	cmdrsp->scsi.vdest.id = scsidev->id;
 	cmdrsp->scsi.vdest.lun = scsidev->lun;
 	/* save datadir */
-	cmdrsp->scsi.data_dir = scsicmd->sc_data_direction;
+	cmdrsp->scsi.data_dir =
+		dma_data_dir_linux_to_spar(scsicmd->sc_data_direction);
 	memcpy(cmdrsp->scsi.cmnd, cdb, MAX_CMND_SIZE);
 	cmdrsp->scsi.bufflen = scsi_bufflen(scsicmd);