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-rw-r--r--block/blk-mq.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 14e31e93a950..7dcef565dc0f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1945,7 +1945,11 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio)
/* bypass scheduler for flush rq */
blk_insert_flush(rq);
blk_mq_run_hw_queue(data.hctx, true);
- } else if (plug && q->nr_hw_queues == 1) {
+ } else if (plug && (q->nr_hw_queues == 1 || q->mq_ops->commit_rqs)) {
+ /*
+ * Use plugging if we have a ->commit_rqs() hook as well, as
+ * we know the driver uses bd->last in a smart fashion.
+ */
unsigned int request_count = plug->rq_count;
struct request *last = NULL;