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-rw-r--r--block/blk-core.c5
-rw-r--r--block/blk-mq.c7
2 files changed, 11 insertions, 1 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index eea2465..473dd69 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1753,8 +1753,11 @@ get_rq:
/*
* If this is the first request added after a plug, fire
* of a plug trace.
+ *
+ * @request_count may become stale because of schedule
+ * out, so check plug list again.
*/
- if (!request_count)
+ if (!request_count || list_empty(&plug->list))
trace_block_plug(q);
else {
struct request *last = list_entry_rq(plug->list.prev);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index ae8df5e..f39e69c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1497,6 +1497,13 @@ static blk_qc_t blk_sq_make_request(struct request_queue *q, struct bio *bio)
struct request *last = NULL;
blk_mq_bio_to_request(rq, bio);
+
+ /*
+ * @request_count may become stale because of schedule
+ * out, so check the list again.
+ */
+ if (list_empty(&plug->mq_list))
+ request_count = 0;
if (!request_count)
trace_block_plug(q);
else
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