[PATCH] [migration] Replace current_migration with migrate_get_current()

[Aadeshveer Singh <aadeshveer07@gmail.com>]

Replaces the direct accesses to global variable `current_migration`
with `migrate_get_current()` to ensure safety and
consistency across systems.

Note: Following this only direct access to `current_migration` will be
* `migrate_get_current()` itself
* `migration_object_init()` initializes `current_migration`
* `migration_is_running()`, as there might be a case where this function
  is called by a thread before object initialization

Signed-off-by: Aadeshveer Singh <aadeshveer07@gmail.com>
---
 migration/migration.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/migration/migration.c b/migration/migration.c
index ecc69dc4d2..f3a96b1949 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -321,7 +321,7 @@ void migration_object_init(void)
 
     current_incoming->exit_on_error = INMIGRATE_DEFAULT_EXIT_ON_ERROR;
 
-    migration_object_check(current_migration, &error_fatal);
+    migration_object_check(migrate_get_current(), &error_fatal);
 
     ram_mig_init();
     dirty_bitmap_mig_init();
@@ -385,7 +385,7 @@ void migration_shutdown(void)
      * stop the migration using this structure
      */
     migration_cancel();
-    object_unref(OBJECT(current_migration));
+    object_unref(OBJECT(migrate_get_current()));
 
     /*
      * Cancel outgoing migration of dirty bitmaps. It should
@@ -1029,7 +1029,7 @@ bool migration_is_running(void)
 
 static bool migration_is_active(void)
 {
-    MigrationState *s = current_migration;
+    MigrationState *s = migrate_get_current();
 
     return (s->state == MIGRATION_STATUS_ACTIVE ||
             s->state == MIGRATION_STATUS_POSTCOPY_DEVICE ||
@@ -1634,7 +1634,7 @@ bool migration_in_bg_snapshot(void)
 
 bool migration_thread_is_self(void)
 {
-    MigrationState *s = current_migration;
+    MigrationState *s = migrate_get_current();
 
     return qemu_thread_is_self(&s->thread);
 }
@@ -3062,7 +3062,7 @@ static MigThrError postcopy_pause(MigrationState *s)
 
 void migration_file_set_error(int ret, Error *err)
 {
-    MigrationState *s = current_migration;
+    MigrationState *s = migrate_get_current();
 
     WITH_QEMU_LOCK_GUARD(&s->qemu_file_lock) {
         if (s->to_dst_file) {
-- 
2.54.0