linux-kernel - [PATCH 4/4] mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

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Message-ID: <20251225023043.18579-5-sj@kernel.org>
Date: Wed, 24 Dec 2025 18:30:37 -0800
From: SeongJae Park <sj@...nel.org>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: SeongJae Park <sj@...nel.org>,
	"# 5 . 18 . x" <stable@...r.kernel.org>,
	damon@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 4/4] mm/damon/sysfs-scheme: cleanup access_pattern subdirs on scheme dir setup failure

When a DAMOS-scheme DAMON sysfs directory setup fails after setup of
access_pattern/ directory, subdirectories of access_pattern/ directory
are not cleaned up. As a result, DAMON sysfs interface is nearly broken
until the system reboots, and the memory for the unremoved directory is
leaked.

Cleanup the directories under such failures.

Fixes: 9bbb820a5bd5 ("mm/damon/sysfs: support DAMOS quotas")
Cc: <stable@...r.kernel.org> # 5.18.x
Signed-off-by: SeongJae Park <sj@...nel.org>
---
 mm/damon/sysfs-schemes.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index 7f14e0d3e7a0..19bc2288cd68 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -2193,7 +2193,7 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 		return err;
 	err = damos_sysfs_set_dests(scheme);
 	if (err)
-		goto put_access_pattern_out;
+		goto rmdir_put_access_pattern_out;
 	err = damon_sysfs_scheme_set_quotas(scheme);
 	if (err)
 		goto put_dests_out;
@@ -2231,7 +2231,8 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
 put_dests_out:
 	kobject_put(&scheme->dests->kobj);
 	scheme->dests = NULL;
-put_access_pattern_out:
+rmdir_put_access_pattern_out:
+	damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern);
 	kobject_put(&scheme->access_pattern->kobj);
 	scheme->access_pattern = NULL;
 	return err;
-- 
2.47.3