[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>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 5829f97a2068..ace49d5bd9c4 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -785,6 +785,7 @@ spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
 {
         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 @@ spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
                 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);