linux-kernel - [PATCH] dm: Remove redundant 'flush

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Date:   Sun, 10 Oct 2021 16:29:28 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     colyli@...e.de, kent.overstreet@...il.com, agk@...hat.com,
        snitzer@...hat.com, dm-devel@...hat.com
Cc:     linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] dm: Remove redundant 'flush_workqueue()' calls

'destroy_workqueue()' already drains the queue before destroying it, so
there is no need to flush it explicitly.

Remove the redundant 'flush_workqueue()' calls.

This was generated with coccinelle:

@@
expression E;
@@
- 	flush_workqueue(E);
	destroy_workqueue(E);

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
 drivers/md/bcache/writeback.c | 4 +---
 drivers/md/dm-bufio.c         | 1 -
 drivers/md/dm-zoned-target.c  | 1 -
 3 files changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 8120da278161..dbb6cb8069d9 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -790,10 +790,8 @@ static int bch_writeback_thread(void *arg)
 		}
 	}
 
-	if (dc->writeback_write_wq) {
-		flush_workqueue(dc->writeback_write_wq);
+	if (dc->writeback_write_wq)
 		destroy_workqueue(dc->writeback_write_wq);
-	}
 	cached_dev_put(dc);
 	wait_for_kthread_stop();
 
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index 50f3e673729c..fc8f8e9f9e39 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -2082,7 +2082,6 @@ static void __exit dm_bufio_exit(void)
 	int bug = 0;
 
 	cancel_delayed_work_sync(&dm_bufio_cleanup_old_work);
-	flush_workqueue(dm_bufio_wq);
 	destroy_workqueue(dm_bufio_wq);
 
 	if (dm_bufio_client_count) {
diff --git a/drivers/md/dm-zoned-target.c b/drivers/md/dm-zoned-target.c
index ae1bc48c0043..dfc822295c25 100644
--- a/drivers/md/dm-zoned-target.c
+++ b/drivers/md/dm-zoned-target.c
@@ -967,7 +967,6 @@ static void dmz_dtr(struct dm_target *ti)
 	struct dmz_target *dmz = ti->private;
 	int i;
 
-	flush_workqueue(dmz->chunk_wq);
 	destroy_workqueue(dmz->chunk_wq);
 
 	for (i = 0; i < dmz->nr_ddevs; i++)
-- 
2.30.2