[SCSI] wd7000: proper fix for boards without sg support

  - code used to set sg_tablesize to zero for board revision
    less than 6. This is no longer supported, therefore I
    use sg_tablesize=1 and open code the sg handling for that case.
  - Get rid of use of SG_NONE which will be removed soon.

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James <James.Bottomley@HansenPartnership.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/scsi/wd7000.c b/drivers/scsi/wd7000.c
index 03cd44f231df..b4304ae78527 100644
--- a/drivers/scsi/wd7000.c
+++ b/drivers/scsi/wd7000.c
@@ -1108,13 +1108,10 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
         scb->host = host;
 
         nseg = scsi_sg_count(SCpnt);
-        if (nseg) {
+        if (nseg > 1) {
                 struct scatterlist *sg;
                 unsigned i;
 
-                if (SCpnt->device->host->sg_tablesize == SG_NONE) {
-                        panic("wd7000_queuecommand: scatter/gather not supported.\n");
-                }
                 dprintk("Using scatter/gather with %d elements.\n", nseg);
 
                 sgb = scb->sgb;
@@ -1128,7 +1125,10 @@ static int wd7000_queuecommand(struct scsi_cmnd *SCpnt,
                 }
         } else {
                 scb->op = 0;
-                any2scsi(scb->dataptr, isa_virt_to_bus(scsi_sglist(SCpnt)));
+                if (nseg) {
+                        struct scatterlist *sg = scsi_sglist(SCpnt);
+                        any2scsi(scb->dataptr, isa_page_to_bus(sg_page(sg)) + sg->offset);
+                }
                 any2scsi(scb->maxlen, scsi_bufflen(SCpnt));
         }
 
@@ -1524,7 +1524,7 @@ static __init int wd7000_detect(struct scsi_host_template *tpnt)
                                  *  For boards before rev 6.0, scatter/gather isn't supported.
                                  */
                                 if (host->rev1 < 6)
-                                        sh->sg_tablesize = SG_NONE;
+                                        sh->sg_tablesize = 1;
 
                                 present++;      /* count it */