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[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>
This commit is contained in:
Boaz Harrosh 2007-11-05 11:21:40 +02:00 committed by James Bottomley
parent fe7ed98fd4
commit 9a3dd65baf
1 changed files with 6 additions and 6 deletions
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12
drivers/scsi/wd7000.c
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@ -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 */