[SCSI] fc class: fix fc_transport_init error handling

If transport_class_register fails we should unregister any
registered classes, or we will leak memory or other
resources.

I did a quick modprobe of scsi_transport_fc to test the
patch.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 14 insertions, 3 deletions

diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 6531c91501be..ddfcecd5099f 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -649,11 +649,22 @@ static __init int fc_transport_init(void)
                 return error;
         error = transport_class_register(&fc_vport_class);
         if (error)
-                return error;
+                goto unreg_host_class;
         error = transport_class_register(&fc_rport_class);
         if (error)
-                return error;
-        return transport_class_register(&fc_transport_class);
+                goto unreg_vport_class;
+        error = transport_class_register(&fc_transport_class);
+        if (error)
+                goto unreg_rport_class;
+        return 0;
+
+unreg_rport_class:
+        transport_class_unregister(&fc_rport_class);
+unreg_vport_class:
+        transport_class_unregister(&fc_vport_class);
+unreg_host_class:
+        transport_class_unregister(&fc_host_class);
+        return error;
 }
 
 static void __exit fc_transport_exit(void)