[SCSI] add SCSI_UNKNOWN and LUN transfer limit restrictions

Original From: Ingo Flaschberger <if@xip.at>

To support the RA4100 array from Compaq.

This patch now correctly handles SCSI_UNKNOWN types with regard to
BLIST_REPORTLUNS2 (allow it) and cdb[1] LUN inclusion (don't).

It also allows a BLIST_MAX_512 flag to restrict the maximum transfer
length to 512 blocks (apparently this is an RA4100 problem).

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 20 insertions, 6 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 32979fee6186..73994e2ac2cb 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -565,7 +565,8 @@ int scsi_dispatch_cmd(struct scsi_cmnd *cmd)
         /* 
          * If SCSI-2 or lower, store the LUN value in cmnd.
          */
-        if (cmd->device->scsi_level <= SCSI_2) {
+        if (cmd->device->scsi_level <= SCSI_2 &&
+            cmd->device->scsi_level != SCSI_UNKNOWN) {
                 cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) |
                                (cmd->device->lun << 5 & 0xe0);
         }
diff --git a/drivers/scsi/scsi_devinfo.c b/drivers/scsi/scsi_devinfo.c
index 84c3937ae8fb..c750d3399a97 100644
--- a/drivers/scsi/scsi_devinfo.c
+++ b/drivers/scsi/scsi_devinfo.c
@@ -132,7 +132,9 @@ static struct {
         {"CMD", "CRA-7280", NULL, BLIST_SPARSELUN},     /* CMD RAID Controller */
         {"CNSI", "G7324", NULL, BLIST_SPARSELUN},       /* Chaparral G7324 RAID */
         {"CNSi", "G8324", NULL, BLIST_SPARSELUN},       /* Chaparral G8324 RAID */
-        {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN},
+        {"COMPAQ", "ARRAY CONTROLLER", NULL, BLIST_SPARSELUN | BLIST_LARGELUN |
+                BLIST_MAX_512 | BLIST_REPORTLUN2},      /* Compaq RA4x00 */
+        {"COMPAQ", "LOGICAL VOLUME", NULL, BLIST_FORCELUN | BLIST_MAX_512}, /* Compaq RA4x00 */
         {"COMPAQ", "CR3500", NULL, BLIST_FORCELUN},
         {"COMPAQ", "MSA1000", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
         {"COMPAQ", "MSA1000 VOLUME", NULL, BLIST_SPARSELUN | BLIST_NOSTARTONADD},
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index f14945996ede..1a5474bd11a1 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -673,6 +673,7 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
         case TYPE_MEDIUM_CHANGER:
         case TYPE_ENCLOSURE:
         case TYPE_COMM:
+        case TYPE_RAID:
         case TYPE_RBC:
                 sdev->writeable = 1;
                 break;
@@ -738,6 +739,13 @@ static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags)
                 sdev->select_no_atn = 1;
 
         /*
+         * Maximum 512 sector transfer length
+         * broken RA4x00 Compaq Disk Array
+         */
+        if (*bflags & BLIST_MAX_512)
+                blk_queue_max_sectors(sdev->request_queue, 512);
+
+        /*
          * Some devices may not want to have a start command automatically
          * issued when a device is added.
          */
@@ -1123,10 +1131,13 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
          * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does
          * support more than 8 LUNs.
          */
-        if ((bflags & BLIST_NOREPORTLUN) || 
-             starget->scsi_level < SCSI_2 ||
-            (starget->scsi_level < SCSI_3 && 
-             (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) )
+        if (bflags & BLIST_NOREPORTLUN)
+                return 1;
+        if (starget->scsi_level < SCSI_2 &&
+            starget->scsi_level != SCSI_UNKNOWN)
+                return 1;
+        if (starget->scsi_level < SCSI_3 &&
+            (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8))
                 return 1;
         if (bflags & BLIST_NOLUN)
                 return 0;