X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=block%2Fas-iosched.c;h=e25a5d79ab2715b2f3a07ce3331e46cd45ab86f1;hb=e0de0206a2a37cd3e0ba9954d9f863e11d6d1782;hp=296708ceceb2d62a8bacd8a954efeb1108d5547e;hpb=e572ec7e4e432de7ecf7bd2e62117646fa64e518;p=linux-2.6

diff --git a/block/as-iosched.c b/block/as-iosched.c
index 296708cece..e25a5d79ab 100644
--- a/block/as-iosched.c
+++ b/block/as-iosched.c
@@ -1844,9 +1844,10 @@ static void __exit as_exit(void)
 	DECLARE_COMPLETION(all_gone);
 	elv_unregister(&iosched_as);
 	ioc_gone = &all_gone;
-	barrier();
+	/* ioc_gone's update must be visible before reading ioc_count */
+	smp_wmb();
 	if (atomic_read(&ioc_count))
-		complete(ioc_gone);
+		wait_for_completion(ioc_gone);
 	synchronize_rcu();
 	kmem_cache_destroy(arq_pool);
 }