blk-mq: update comments on blk_mq_quiesce_queue()

[mirror_ubuntu-bionic-kernel.git] / block / blk-mq.c

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 40b22c7f684e5c175aeea1e92fe11aaecf02de00..f2a73190f60de4f2bb478ce03195932c689bab5c 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -155,12 +155,13 @@ void blk_mq_unfreeze_queue(struct request_queue *q)
 EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
 
 /**
- * blk_mq_quiesce_queue() - wait until all ongoing queue_rq calls have finished
+ * blk_mq_quiesce_queue() - wait until all ongoing dispatches have finished
  * @q: request queue.
  *
  * Note: this function does not prevent that the struct request end_io()
- * callback function is invoked. Additionally, it is not prevented that
- * new queue_rq() calls occur unless the queue has been stopped first.
+ * callback function is invoked. Once this function is returned, we make
+ * sure no dispatch can happen until the queue is unquiesced via
+ * blk_mq_unquiesce_queue().
  */
 void blk_mq_quiesce_queue(struct request_queue *q)
 {