[SCSI] libsas: fix sas_find_bcast_phy() in the presence of 'vacant' phys

If an expander reports 'PHY VACANT' for a phy index prior to the one
that generated a BCN libsas fails rediscovery.  Since a vacant phy is
defined as a valid phy index that will never have an attached device
just continue the search.

Cc: <stable@vger.kernel.org>
Signed-off-by: Thomas Jackson <thomas.p.jackson@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 12 insertions, 5 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index 05acd9e35fc4..833bea067a77 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -1718,9 +1718,17 @@ static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
                 int phy_change_count = 0;
 
                 res = sas_get_phy_change_count(dev, i, &phy_change_count);
-                if (res)
-                        goto out;
-                else if (phy_change_count != ex->ex_phy[i].phy_change_count) {
+                switch (res) {
+                case SMP_RESP_PHY_VACANT:
+                case SMP_RESP_NO_PHY:
+                        continue;
+                case SMP_RESP_FUNC_ACC:
+                        break;
+                default:
+                        return res;
+                }
+
+                if (phy_change_count != ex->ex_phy[i].phy_change_count) {
                         if (update)
                                 ex->ex_phy[i].phy_change_count =
                                         phy_change_count;
@@ -1728,8 +1736,7 @@ static int sas_find_bcast_phy(struct domain_device *dev, int *phy_id,
                         return 0;
                 }
         }
-out:
-        return res;
+        return 0;
 }
 
 static int sas_get_ex_change_count(struct domain_device *dev, int *ecc)