[BLOCK] elevator: run queue in elevator_switch

elevator_dispatch needs to run queue after forced dispatching;
otherwise, the queue might stall.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jens Axboe <axboe@suse.de>
diff --git a/block/elevator.c b/block/elevator.c
index e58928e8..a475b1a 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -696,6 +696,8 @@
 		;
 
 	while (q->rq.elvpriv) {
+		blk_remove_plug(q);
+		q->request_fn(q);
 		spin_unlock_irq(q->queue_lock);
 		msleep(10);
 		spin_lock_irq(q->queue_lock);