1 files changed, 5 insertions, 1 deletions

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 4a45efabb203..2fcaf286f1de 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2909,7 +2909,11 @@ int __init init_ext4_mballoc(void)
 
 void exit_ext4_mballoc(void)
 {
-        /* XXX: synchronize_rcu(); */
+        /* 
+         * Wait for completion of call_rcu()'s on ext4_pspace_cachep
+         * before destroying the slab cache.
+         */
+        rcu_barrier();
         kmem_cache_destroy(ext4_pspace_cachep);
         kmem_cache_destroy(ext4_ac_cachep);
         kmem_cache_destroy(ext4_free_ext_cachep);