The trace point is for tracing plug event of each request
queue instead of each task, so we should check the request
count in the plug list from current queue instead of
current task.

Signed-off-by: Ming Lei <ming....@canonical.com>
---
 block/blk-mq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index d55d022..a5e33bc 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1377,7 +1377,7 @@ static void blk_sq_make_request(struct request_queue *q, 
struct bio *bio)
        plug = current->plug;
        if (plug) {
                blk_mq_bio_to_request(rq, bio);
-               if (list_empty(&plug->mq_list))
+               if (!request_count)
                        trace_block_plug(q);
                else if (request_count >= BLK_MAX_REQUEST_COUNT) {
                        blk_flush_plug_list(plug, false);
-- 
1.9.1

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