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-rw-r--r--block/as-iosched.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/block/as-iosched.c b/block/as-iosched.c
index 296708ceceb2..e25a5d79ab27 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1844,9 +1844,10 @@ static void __exit as_exit(void)
1844 DECLARE_COMPLETION(all_gone); 1844 DECLARE_COMPLETION(all_gone);
1845 elv_unregister(&iosched_as); 1845 elv_unregister(&iosched_as);
1846 ioc_gone = &all_gone; 1846 ioc_gone = &all_gone;
1847 barrier(); 1847 /* ioc_gone's update must be visible before reading ioc_count */
1848 smp_wmb();
1848 if (atomic_read(&ioc_count)) 1849 if (atomic_read(&ioc_count))
1849 complete(ioc_gone); 1850 wait_for_completion(ioc_gone);
1850 synchronize_rcu(); 1851 synchronize_rcu();
1851 kmem_cache_destroy(arq_pool); 1852 kmem_cache_destroy(arq_pool);
1852} 1853}