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>

2 files changed, 17 insertions, 68 deletions

diff --git a/drivers/ieee1394/sbp2.c b/drivers/ieee1394/sbp2.c
index f0763b797238..372a7726063c 100644
--- a/drivers/ieee1394/sbp2.c
+++ b/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
@@ -2371,6 +2348,16 @@ static int sbp2scsi_queuecommand(struct scsi_cmnd *SCpnt,
         }
 
         /*
+         * 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
          */
         if (sbp2_send_command(scsi_id, SCpnt, done)) {
diff --git a/drivers/ieee1394/sbp2.h b/drivers/ieee1394/sbp2.h
index abc647bae5b1..8e227c52b72f 100644
--- a/drivers/ieee1394/sbp2.h
+++ b/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 {