[SCSI] libsas: disable scanning lun > 0 on ata devices

Currently mvsas and pm8001 have custom ->slave_alloc implementations to
achieve this.  Uplevel it for all libsas drivers as isci encounters problems
with atapi devices when scanning past lun0.

Just do what Darrick suggested [1], and limit the scan for ata devices.

[1] http://marc.info/?l=linux-scsi&m=116604101119861&w=2

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_transport_sas.c b/drivers/scsi/scsi_transport_sas.c
index c6fcf76cade5..9d9330ae4213 100644
--- a/drivers/scsi/scsi_transport_sas.c
+++ b/drivers/scsi/scsi_transport_sas.c
@@ -1545,8 +1545,14 @@ int sas_rphy_add(struct sas_rphy *rphy)
 
         if (identify->device_type == SAS_END_DEVICE &&
             rphy->scsi_target_id != -1) {
-                scsi_scan_target(&rphy->dev, 0,
-                                rphy->scsi_target_id, SCAN_WILD_CARD, 0);
+                int lun;
+
+                if (identify->target_port_protocols & SAS_PROTOCOL_SSP)
+                        lun = SCAN_WILD_CARD;
+                else
+                        lun = 0;
+
+                scsi_scan_target(&rphy->dev, 0, rphy->scsi_target_id, lun, 0);
         }
 
         return 0;