linux-kernel - [PATCH v3 02/10] dm: remove free_table

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Message-Id: <20221115141054.1051801-3-yukuai1@huaweicloud.com>
Date:   Tue, 15 Nov 2022 22:10:46 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     hch@....de, axboe@...nel.dk, agk@...hat.com, snitzer@...nel.org,
        dm-devel@...hat.com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yukuai1@...weicloud.com, yi.zhang@...wei.com
Subject: [PATCH v3 02/10] dm: remove free_table_devices

From: Christoph Hellwig <hch@....de>

free_table_devices just warns and frees all table_device structures when
the target removal did not remove them.  This should never happen, but
if it did, just freeing the structure without deleting them from the
list or cleaning up the resources would not help at all.  So just WARN on
a non-empty list instead.

Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/md/dm.c | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 95a1ee3d314e..19d25bf997be 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -833,19 +833,6 @@ void dm_put_table_device(struct mapped_device *md, struct dm_dev *d)
 	mutex_unlock(&md->table_devices_lock);
 }
 
-static void free_table_devices(struct list_head *devices)
-{
-	struct list_head *tmp, *next;
-
-	list_for_each_safe(tmp, next, devices) {
-		struct table_device *td = list_entry(tmp, struct table_device, list);
-
-		DMWARN("dm_destroy: %s still exists with %d references",
-		       td->dm_dev.name, refcount_read(&td->count));
-		kfree(td);
-	}
-}
-
 /*
  * Get the geometry associated with a dm device
  */
@@ -2122,7 +2109,7 @@ static void free_dev(struct mapped_device *md)
 
 	cleanup_mapped_device(md);
 
-	free_table_devices(&md->table_devices);
+	WARN_ON_ONCE(!list_empty(&md->table_devices));
 	dm_stats_cleanup(&md->stats);
 	free_minor(minor);
 
-- 
2.31.1