[SCSI] libsas: sas_rediscover_dev did not look at the SMP exec status.

The discovery function "sas_rediscover_dev" had two bugs: 1) it did
not pay attention to the return status from the SMP task execution;
2) the stack variable used for the returned SAS address was compared
against 0 without being initialized.

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

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index caa0525d2523..af659cc8308c 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -2005,6 +2005,7 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
         u8 sas_addr[8];
         int res;
 
+        memset(sas_addr, 0, 8);
         res = sas_get_phy_attached_dev(dev, phy_id, sas_addr, &type);
         switch (res) {
         case SMP_RESP_NO_PHY:
@@ -2017,9 +2018,13 @@ static int sas_rediscover_dev(struct domain_device *dev, int phy_id, bool last)
                 return res;
         case SMP_RESP_FUNC_ACC:
                 break;
+        case -ECOMM:
+                break;
+        default:
+                return res;
         }
 
-        if (SAS_ADDR(sas_addr) == 0) {
+        if ((SAS_ADDR(sas_addr) == 0) || (res == -ECOMM)) {
                 phy->phy_state = PHY_EMPTY;
                 sas_unregister_devs_sas_addr(dev, phy_id, last);
                 return res;