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

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.

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

1 files changed, 33 insertions, 6 deletions

diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index fb7df7b75811..21f538e4a0b5 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -548,7 +548,7 @@ int sas_discover_sata(struct domain_device *dev)
 
         res = sas_notify_lldd_dev_found(dev);
         if (res)
-                return res;
+                goto out_err2;
 
         switch (dev->dev_type) {
         case SATA_DEV:
@@ -560,11 +560,25 @@ int sas_discover_sata(struct domain_device *dev)
         default:
                 break;
         }
+        if (res)
+                goto out_err;
 
         sas_notify_lldd_dev_gone(dev);
-        if (!res) {
-                sas_notify_lldd_dev_found(dev);
-        }
+        res = sas_notify_lldd_dev_found(dev);
+        if (res)
+                goto out_err2;
+
+        res = sas_rphy_add(dev->rphy);
+        if (res)
+                goto out_err;
+
+        return res;
+
+out_err:
+        sas_notify_lldd_dev_gone(dev);
+out_err2:
+        sas_rphy_free(dev->rphy);
+        dev->rphy = NULL;
         return res;
 }
 
@@ -580,7 +594,7 @@ int sas_discover_end_dev(struct domain_device *dev)
 
         res = sas_notify_lldd_dev_found(dev);
         if (res)
-                return res;
+                goto out_err2;
 
         res = sas_rphy_add(dev->rphy);
         if (res)
@@ -589,12 +603,21 @@ int sas_discover_end_dev(struct domain_device *dev)
         /* do this to get the end device port attributes which will have
          * been scanned in sas_rphy_add */
         sas_notify_lldd_dev_gone(dev);
-        sas_notify_lldd_dev_found(dev);
+        res = sas_notify_lldd_dev_found(dev);
+        if (res)
+                goto out_err3;
 
         return 0;
 
 out_err:
         sas_notify_lldd_dev_gone(dev);
+out_err2:
+        sas_rphy_free(dev->rphy);
+        dev->rphy = NULL;
+        return res;
+out_err3:
+        sas_rphy_delete(dev->rphy);
+        dev->rphy = NULL;
         return res;
 }
 
@@ -686,6 +709,10 @@ static void sas_discover_domain(struct work_struct *work)
         }
 
         if (error) {
+                spin_lock(&port->dev_list_lock);
+                list_del_init(&port->port_dev->dev_list_node);
+                spin_unlock(&port->dev_list_lock);
+
                 kfree(port->port_dev); /* not kobject_register-ed yet */
                 port->port_dev = NULL;
         }