Merge branch 'merge'

3 files changed, 5 insertions, 2 deletions

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index aae3123..3a3aee0 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1561,7 +1561,7 @@ restart:
 		/* ->key must be copied to avoid race with cfq_exit_queue() */
 		k = __cic->key;
 		if (unlikely(!k)) {
-			cfq_drop_dead_cic(ioc, cic);
+			cfq_drop_dead_cic(ioc, __cic);
 			goto restart;
 		}
 
diff --git a/block/elevator.c b/block/elevator.c
index bc7baee..9b72dc7 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -765,7 +765,8 @@ void elv_unregister(struct elevator_type *e)
 		read_lock(&tasklist_lock);
 		do_each_thread(g, p) {
 			task_lock(p);
-			e->ops.trim(p->io_context);
+			if (p->io_context)
+				e->ops.trim(p->io_context);
 			task_unlock(p);
 		} while_each_thread(g, p);
 		read_unlock(&tasklist_lock);
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 61d6b3c..ddd9253 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3628,6 +3628,8 @@ struct io_context *current_io_context(gfp_t gfp_flags)
 		ret->nr_batch_requests = 0; /* because this is 0 */
 		ret->aic = NULL;
 		ret->cic_root.rb_node = NULL;
+		/* make sure set_task_ioprio() sees the settings above */
+		smp_wmb();
 		tsk->io_context = ret;
 	}