Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/linux-2.6-block:
  blk-cgroup: Fix an RCU warning in blkiocg_create()
  blk-cgroup: Fix RCU correctness warning in cfq_init_queue()
  drbd: don't expose failed local READ to upper layers

block/blk-cgroup.c

@@ -286,16 +286,16 @@ static void blkiocg_destroy(struct cgroup_subsys *subsys, struct cgroup *cgroup)
 static struct cgroup_subsys_state *
 blkiocg_create(struct cgroup_subsys *subsys, struct cgroup *cgroup)
 {
-	struct blkio_cgroup *blkcg, *parent_blkcg;
+	struct blkio_cgroup *blkcg;
+	struct cgroup *parent = cgroup->parent;
 
-	if (!cgroup->parent) {
+	if (!parent) {
 		blkcg = &blkio_root_cgroup;
 		goto done;
 	}
 
 	/* Currently we do not support hierarchy deeper than two level (0,1) */
-	parent_blkcg = cgroup_to_blkio_cgroup(cgroup->parent);
-	if (css_depth(&parent_blkcg->css) > 0)
+	if (parent != cgroup->top_cgroup)
 		return ERR_PTR(-EINVAL);
 
 	blkcg = kzalloc(sizeof(*blkcg), GFP_KERNEL);

block/cfq-iosched.c

@@ -3694,8 +3694,10 @@ static void *cfq_init_queue(struct request_queue *q)
 	 * to make sure that cfq_put_cfqg() does not try to kfree root group
 	 */
 	atomic_set(&cfqg->ref, 1);
+	rcu_read_lock();
 	blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd,
 					0);
+	rcu_read_unlock();
 #endif
 	/*
 	 * Not strictly needed (since RB_ROOT just clears the node and we

drivers/block/drbd/drbd_worker.c

@@ -235,7 +235,7 @@ void drbd_endio_pri(struct bio *bio, int error)
 	if (unlikely(error)) {
 		what = (bio_data_dir(bio) == WRITE)
 			? write_completed_with_error
-			: (bio_rw(bio) == READA)
+			: (bio_rw(bio) == READ)
 			  ? read_completed_with_error
 			  : read_ahead_completed_with_error;
 	} else