Testing for v2: configfs: add lock class key to struct configfs_fragment for frag_sem

[Prithvi Tambewagh <activprithvi@gmail.com>]

#syz test upstream 3a8660878839faadb4f1a6dd72c3179c1df56787

Signed-off-by: Prithvi Tambewagh <activprithvi@gmail.com>
---
 fs/configfs/configfs_internal.h | 1 +
 fs/configfs/dir.c               | 6 +++++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index 0b969d0eb8ff..15bcde6c878b 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -21,6 +21,7 @@
 struct configfs_fragment {
 	atomic_t frag_count;
 	struct rw_semaphore frag_sem;
+	struct lock_class_key frag_sem_key;
 	bool frag_dead;
 };
 
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 81f4f06bc87e..10c76cef88c9 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -163,6 +163,8 @@ static struct configfs_fragment *new_fragment(void)
 	if (p) {
 		atomic_set(&p->frag_count, 1);
 		init_rwsem(&p->frag_sem);
+		lockdep_register_key(&p->frag_sem_key);
+		lockdep_set_class(&p->frag_sem, &p->frag_sem_key);
 		p->frag_dead = false;
 	}
 	return p;
@@ -170,8 +172,10 @@ static struct configfs_fragment *new_fragment(void)
 
 void put_fragment(struct configfs_fragment *frag)
 {
-	if (frag && atomic_dec_and_test(&frag->frag_count))
+	if (frag && atomic_dec_and_test(&frag->frag_count)) {
+		lockdep_unregister_key(&frag->frag_sem_key);
 		kfree(frag);
+	}
 }
 
 struct configfs_fragment *get_fragment(struct configfs_fragment *frag)

base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
-- 
2.34.1