[SCSI] libsas: Clean up rphys/port dev list after a discovery error on an expander

sas_get_port_device assigns a rphy to a domain device in anticipation
of finding a disk.  When a discovery error occurs in
sas_discover_{sata,sas,expander}*, however, we need to clean up that
rphy and the port device list so that we don't GPF.  In addition, we
need to check the result of the second sas_notify_lldd_dev_found.
This patch seems ok on a x260, x366 and x206m.

This patch fixes up sas_expander.c separately because jejb has some
cleanup patches of his own that are a prerequisite.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c
index d31e6fa466f7..0dfd97e7e96c 100644
--- a/drivers/scsi/libsas/sas_expander.c
+++ b/drivers/scsi/libsas/sas_expander.c
@@ -668,7 +668,6 @@ static struct domain_device *sas_ex_discover_end_dev(
 
  out_list_del:
         list_del(&child->dev_list_node);
-        sas_rphy_free(rphy);
  out_free:
         sas_port_delete(phy->port);
  out_err:
@@ -1431,14 +1430,27 @@ int sas_discover_root_expander(struct domain_device *dev)
         int res;
         struct sas_expander_device *ex = rphy_to_expander_device(dev->rphy);
 
-        sas_rphy_add(dev->rphy);
+        res = sas_rphy_add(dev->rphy);
+        if (res)
+                goto out_err;
 
         ex->level = dev->port->disc.max_level; /* 0 */
         res = sas_discover_expander(dev);
-        if (!res)
-                sas_ex_bfs_disc(dev->port);
+        if (res)
+                goto out_err2;
+
+        sas_ex_bfs_disc(dev->port);
 
         return res;
+
+out_err2:
+        sas_rphy_delete(dev->rphy);
+        dev->rphy = NULL;
+        return res;
+out_err:
+        sas_rphy_free(dev->rphy);
+        dev->rphy = NULL;
+        return res;
 }
 
 /* ---------- Domain revalidation ---------- */