sbp2: delete sbp2scsi_direction_table

DMA_BIDIRECTIONAL data direction may be handled properly by Linux in the
future.  For now, reject it instead to convert it to another direction.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jody McIntyre <scjody@modernduck.com>

drivers/ieee1394/sbp2.c

@@ -1740,28 +1740,15 @@ static int sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
 	command_orb->misc |= ORB_SET_SPEED(scsi_id->speed_code);
 	command_orb->misc |= ORB_SET_NOTIFY(1);	/* Notify us when complete */
 
-	/*
-	 * Get the direction of the transfer. If the direction is unknown, then use our
-	 * goofy table as a back-up.
-	 */
-	switch (dma_dir) {
-	case DMA_NONE:
+	if (dma_dir == DMA_NONE)
 		orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
-		break;
-	case DMA_TO_DEVICE:
+	else if (dma_dir == DMA_TO_DEVICE && scsi_request_bufflen)
 		orb_direction = ORB_DIRECTION_WRITE_TO_MEDIA;
-		break;
-	case DMA_FROM_DEVICE:
+	else if (dma_dir == DMA_FROM_DEVICE && scsi_request_bufflen)
 		orb_direction = ORB_DIRECTION_READ_FROM_MEDIA;
-		break;
-	case DMA_BIDIRECTIONAL:
-	default:
-		SBP2_ERR("SCSI data transfer direction not specified. "
-			 "Update the SBP2 direction table in sbp2.h if "
-			 "necessary for your application");
-		__scsi_print_command(scsi_cmd);
-		orb_direction = sbp2scsi_direction_table[*scsi_cmd];
-		break;
+	else {
+		SBP2_WARN("Falling back to DMA_NONE");
+		orb_direction = ORB_DIRECTION_NO_DATA_TRANSFER;
 	}
 
 	/*
@@ -1880,16 +1867,6 @@ static int sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
 			command_orb->misc |= ORB_SET_DATA_SIZE(scsi_request_bufflen);
 			command_orb->misc |= ORB_SET_DIRECTION(orb_direction);
 
-			/*
-			 * Sanity, in case our direction table is not
-			 * up-to-date
-			 */
-			if (!scsi_request_bufflen) {
-				command_orb->data_descriptor_hi = 0x0;
-				command_orb->data_descriptor_lo = 0x0;
-				command_orb->misc |= ORB_SET_DIRECTION(1);
-			}
-
 		} else {
 			/*
 			 * Need to turn this into page tables, since the
@@ -2370,6 +2347,16 @@ static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt,
 		goto done;
 	}
 
+	/*
+	 * Bidirectional commands are not yet implemented,
+	 * and unknown transfer direction not handled.
+	 */
+	if (SCpnt->sc_data_direction == DMA_BIDIRECTIONAL) {
+		SBP2_ERR("Cannot handle DMA_BIDIRECTIONAL - rejecting command");
+		result = DID_ERROR << 16;
+		goto done;
+	}
+
 	/*
 	 * Try and send our SCSI command
 	 */

drivers/ieee1394/sbp2.h

@@ -260,45 +260,7 @@ struct sbp2_status_block {
 #define SBP2_MAX_SG_ELEMENT_LENGTH	0xf000
 #define SBP2_MAX_UDS_PER_NODE		16	/* Maximum scsi devices per node */
 #define SBP2_MAX_SECTORS		255	/* Max sectors supported */
-
-/*
- * SCSI direction table...
- * (now used as a back-up in case the direction passed down from above is "unknown")
- *
- * DIN = IN data direction
- * DOU = OUT data direction
- * DNO = No data transfer
- * DUN = Unknown data direction
- *
- * Opcode 0xec (Teac specific "opc execute") possibly should be DNO,
- * but we'll change it when somebody reports a problem with this.
- */
-#define DIN				ORB_DIRECTION_READ_FROM_MEDIA
-#define DOU				ORB_DIRECTION_WRITE_TO_MEDIA
-#define DNO				ORB_DIRECTION_NO_DATA_TRANSFER
-#define DUN				DIN
-
-static unchar sbp2scsi_direction_table[0x100] = {
-	DNO,DNO,DIN,DIN,DOU,DIN,DIN,DOU,DIN,DUN,DOU,DOU,DUN,DUN,DUN,DIN,
-	DNO,DIN,DIN,DOU,DIN,DOU,DNO,DNO,DOU,DNO,DIN,DNO,DIN,DOU,DNO,DUN,
-	DIN,DUN,DIN,DIN,DOU,DIN,DUN,DUN,DIN,DIN,DOU,DNO,DUN,DIN,DOU,DOU,
-	DOU,DOU,DOU,DNO,DIN,DNO,DNO,DIN,DOU,DOU,DOU,DOU,DIN,DOU,DIN,DOU,
-	DOU,DOU,DIN,DIN,DIN,DNO,DIN,DNO,DNO,DNO,DUN,DNO,DOU,DIN,DNO,DUN,
-	DUN,DIN,DIN,DNO,DNO,DOU,DUN,DUN,DNO,DIN,DIN,DNO,DIN,DOU,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
-	DUN,DNO,DOU,DOU,DIN,DNO,DNO,DNO,DIN,DNO,DOU,DUN,DNO,DIN,DOU,DOU,
-	DOU,DOU,DOU,DNO,DUN,DIN,DOU,DIN,DIN,DIN,DNO,DNO,DNO,DIN,DIN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DOU,DUN,DUN,DUN,DUN,DUN,
-	DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN
-};
-
-/* This should be safe */
-#define SBP2_MAX_CMDS		8
+#define SBP2_MAX_CMDS			8	/* This should be safe */
 
 /* This is the two dma types we use for cmd_dma below */
 enum cmd_dma_types {