[merged mm-hotfixes-stable] mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.patch removed from -mm tree

[merged mm-hotfixes-stable] mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure
has been removed from the -mm tree.  Its filename was
     mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure.patch

This patch was dropped because it was merged into the mm-hotfixes-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/sysfs: cleanup attrs subdirs on context dir setup failure
Date: Wed, 24 Dec 2025 18:30:35 -0800

When a context DAMON sysfs directory setup is failed after setup of attrs/
directory, subdirectories of attrs/ 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.

Link: https://lkml.kernel.org/r/20251225023043.18579-3-sj@kernel.org
Fixes: c951cd3b8901 ("mm/damon: implement a minimal stub for sysfs-based DAMON interface")
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: chongjiapeng <jiapeng.chong@linux.alibaba.com>
Cc: <stable@vger.kernel.org> # 5.18.x
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/sysfs.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/mm/damon/sysfs.c~mm-damon-sysfs-cleanup-attrs-subdirs-on-context-dir-setup-failure
+++ a/mm/damon/sysfs.c
@@ -950,7 +950,7 @@ static int damon_sysfs_context_add_dirs(
 
 	err = damon_sysfs_context_set_targets(context);
 	if (err)
-		goto put_attrs_out;
+		goto rmdir_put_attrs_out;
 
 	err = damon_sysfs_context_set_schemes(context);
 	if (err)
@@ -960,7 +960,8 @@ static int damon_sysfs_context_add_dirs(
 put_targets_attrs_out:
 	kobject_put(&context->targets->kobj);
 	context->targets = NULL;
-put_attrs_out:
+rmdir_put_attrs_out:
+	damon_sysfs_attrs_rm_dirs(context->attrs);
 	kobject_put(&context->attrs->kobj);
 	context->attrs = NULL;
 	return err;
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-core-introduce-nr_snapshots-damos-stat.patch
mm-damon-sysfs-schemes-introduce-nr_snapshots-damos-stat-file.patch
docs-mm-damon-design-update-for-nr_snapshots-damos-stat.patch
docs-admin-guide-mm-damon-usage-update-for-nr_snapshots-damos-stat.patch
docs-abi-damon-update-for-nr_snapshots-damos-stat.patch
mm-damon-update-damos-kerneldoc-for-stat-field.patch
mm-damon-core-implement-max_nr_snapshots.patch
mm-damon-sysfs-schemes-implement-max_nr_snapshots-file.patch
docs-mm-damon-design-update-for-max_nr_snapshots.patch
docs-admin-guide-mm-damon-usage-update-for-max_nr_snapshots.patch
docs-abi-damon-update-for-max_nr_snapshots.patch
mm-damon-core-add-trace-point-for-damos-stat-per-apply-interval.patch
mm-damon-tests-core-kunit-add-test-cases-for-multiple-regions-in-damon_test_split_regions_of-fix.patch