From: Ming Lei <ming.lei@redhat.com>
Date: Fri, 25 Jun 2021 10:02:48 +0800
Subject: [PATCH] blk-mq: update hctx->dispatch_busy in case of real scheduler
Git-commit: cb9516be7708a2a18ec0a19fe3a225b5b3bc92c7
Patch-mainline: v5.14-rc1
References: git-fixes

Commit 6e6fcbc27e77 ("blk-mq: support batching dispatch in case of io")
starts to support io batching submission by using hctx->dispatch_busy.

However, blk_mq_update_dispatch_busy() isn't changed to update hctx->dispatch_busy
in that commit, so fix the issue by updating hctx->dispatch_busy in case
of real scheduler.

Reported-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Fixes: 6e6fcbc27e77 ("blk-mq: support batching dispatch in case of io")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20210625020248.1630497-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 block/blk-mq.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 3115ea2d0990..c2f3550337f7 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1224,9 +1224,6 @@ static void blk_mq_update_dispatch_busy(struct blk_mq_hw_ctx *hctx, bool busy)
 {
 	unsigned int ewma;
 
-	if (hctx->queue->elevator)
-		return;
-
 	ewma = hctx->dispatch_busy;
 
 	if (!ewma && !busy)
-- 
2.29.2