[SCSI] spi transport: don't allow dt to be set on SE or HVD buses
This is really just a belt and braces test. The standards require
disks to respond DT not capable on a non-LVD bus ... however, not all
disks follow the standards ...
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 5829f97..ace49d5 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -785,6 +785,7 @@
{
struct spi_internal *i = to_spi_internal(sdev->host->transportt);
struct scsi_target *starget = sdev->sdev_target;
+ struct Scsi_Host *shost = sdev->host;
int len = sdev->inquiry_len;
/* first set us up for narrow async */
DV_SET(offset, 0);
@@ -844,6 +845,14 @@
if (spi_min_period(starget) == 8)
DV_SET(pcomp_en, 1);
}
+ /* now that we've done all this, actually check the bus
+ * signal type (if known). Some devices are stupid on
+ * a SE bus and still claim they can try LVD only settings */
+ if (i->f->get_signalling)
+ i->f->get_signalling(shost);
+ if (spi_signalling(shost) == SPI_SIGNAL_SE ||
+ spi_signalling(shost) == SPI_SIGNAL_HVD)
+ DV_SET(dt, 0);
/* Do the read only INQUIRY tests */
spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
spi_dv_device_compare_inquiry);