blk-mq: fix for trace_block_plug()

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 <[email protected]> Reviewed-by: Jeff Moyer <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
iegor · Oct 21, 2015 · 676d060 · 676d060
1 parent 7460d38
commit 676d060
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/block/blk-mq.c b/block/blk-mq.c
@@ -1380,7 +1380,7 @@ 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);