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centosplus patch

Patch provided by RH in BZ#1671551

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 645b4f138a6c..8492e7ca4ef8 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -76,6 +76,9 @@ static void blk_mq_check_inflight(struct blk_mq_hw_ctx *hctx,
 {
 	struct mq_inflight *mi = priv;
 
+	if (!blk_mq_request_started(rq))
+		return;
+
 	/*
 	 * index[0] counts the specific partition that was asked
 	 * for. index[1] counts the ones that are active on the
@@ -103,6 +106,9 @@ static void blk_mq_check_inflight_rw(struct blk_mq_hw_ctx *hctx,
 {
 	struct mq_inflight *mi = priv;
 
+	if (!blk_mq_request_started(rq))
+		return;
+
 	if (rq->part == mi->part)
 		mi->inflight[rq_data_dir(rq)]++;
 }