File 60b3fcd9-libxl-MigratePrepare.patch of Package libvirt.17937

commit 60b3fcd90cbd83e5721484d72414dfee1706dab8
Author: Jim Fehlig <jfehlig@suse.com>
Date:   Tue Mar 13 10:48:28 2018 -0600

    libxl: MigratePrepare: use standard begin and end API pattern
    
    libxlDomainMigrationPrepare adds the incoming domain def to the list
    of domains via virDomainObjListAdd, but never adds its own ref to the
    returned virDomainObj as other callers of virDomainObjListAdd do.
    libxlDomainMigrationPrepareTunnel3 suffers the same discrepancy.
    
    Change both to add a ref to the virDomainObj after a successful
    virDomainObjListAdd, similar to other callers. This ensures a consistent
    pattern throughout the drivers and allows using the virDomainObjEndAPI
    function for cleanup.
    
    Signed-off-by: Jim Fehlig <jfehlig@suse.com>
    Reviewed-by: John Ferlan <jferlan@redhat.com>

Index: libvirt-4.0.0/src/libxl/libxl_migration.c
===================================================================
--- libvirt-4.0.0.orig/src/libxl/libxl_migration.c
+++ libvirt-4.0.0/src/libxl/libxl_migration.c
@@ -583,6 +583,7 @@ libxlDomainMigrationPrepareTunnel3(virCo
                                    NULL)))
         goto error;
 
+    virObjectRef(vm);
     *def = NULL;
     priv = vm->privateData;
 
@@ -635,13 +636,11 @@ libxlDomainMigrationPrepareTunnel3(virCo
     /* Remove virDomainObj from domain list */
     if (vm) {
         virDomainObjListRemove(driver->domains, vm);
-        vm = NULL;
+        virObjectLock(vm);
     }
 
  done:
-    if (vm)
-        virObjectUnlock(vm);
-
+    virDomainObjEndAPI(&vm);
     return ret;
 }
 
@@ -683,6 +682,7 @@ libxlDomainMigrationPrepare(virConnectPt
                                    NULL)))
         goto error;
 
+    virObjectRef(vm);
     *def = NULL;
     priv = vm->privateData;
 
@@ -810,7 +810,7 @@ libxlDomainMigrationPrepare(virConnectPt
     /* Remove virDomainObj from domain list */
     if (vm) {
         virDomainObjListRemove(driver->domains, vm);
-        vm = NULL;
+        virObjectLock(vm);
     }
 
  done:
@@ -820,8 +820,7 @@ libxlDomainMigrationPrepare(virConnectPt
         VIR_FREE(hostname);
     else
         virURIFree(uri);
-    if (vm)
-        virObjectUnlock(vm);
+    virDomainObjEndAPI(&vm);
     virObjectUnref(cfg);
     return ret;
 }