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-rw-r--r--drivers/scsi/scsi_transport_spi.c28
1 files changed, 19 insertions, 9 deletions
diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 718a2bc4ed5..38a53b5f9e9 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -812,12 +812,10 @@ spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
if (!scsi_device_sync(sdev) && !scsi_device_dt(sdev))
return;
- /* see if the device has an echo buffer. If it does we can
- * do the SPI pattern write tests */
-
- len = 0;
- if (scsi_device_dt(sdev))
- len = spi_dv_device_get_echo_buffer(sdev, buffer);
+ /* len == -1 is the signal that we need to ascertain the
+ * presence of an echo buffer before trying to use it. len ==
+ * 0 means we don't have an echo buffer */
+ len = -1;
retry:
@@ -840,11 +838,23 @@ spi_dv_device_internal(struct scsi_device *sdev, u8 *buffer)
if (spi_min_period(starget) == 8)
DV_SET(pcomp_en, 1);
}
+ /* Do the read only INQUIRY tests */
+ spi_dv_retrain(sdev, buffer, buffer + sdev->inquiry_len,
+ spi_dv_device_compare_inquiry);
+ /* See if we actually managed to negotiate and sustain DT */
+ if (i->f->get_dt)
+ i->f->get_dt(starget);
+
+ /* see if the device has an echo buffer. If it does we can do
+ * the SPI pattern write tests. Because of some broken
+ * devices, we *only* try this on a device that has actually
+ * negotiated DT */
+
+ if (len == -1 && spi_dt(starget))
+ len = spi_dv_device_get_echo_buffer(sdev, buffer);
- if (len == 0) {
+ if (len <= 0) {
starget_printk(KERN_INFO, starget, "Domain Validation skipping write tests\n");
- spi_dv_retrain(sdev, buffer, buffer + len,
- spi_dv_device_compare_inquiry);
return;
}