[PATCH] liveupdate: use scoped_guard for mutex in session operations

[Chenghao Duan]

Replace manually paired mutex_lock/unlock with scoped_guard to align
with the coding style of the rest of the codebase and simplify locking
paths.

Signed-off-by: Chenghao Duan <duanchenghao at kylinos.cn>
---
 kernel/liveupdate/luo_session.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/kernel/liveupdate/luo_session.c b/kernel/liveupdate/luo_session.c
index f38b5b18f3f8..06307868a44e 100644
--- a/kernel/liveupdate/luo_session.c
+++ b/kernel/liveupdate/luo_session.c
@@ -290,9 +290,8 @@ static int luo_session_retrieve_fd(struct luo_session *session,
 	if (argp->fd < 0)
 		return argp->fd;
 
-	mutex_lock(&session->mutex);
-	err = luo_retrieve_file(&session->file_set, argp->token, &file);
-	mutex_unlock(&session->mutex);
+	scoped_guard(mutex, &session->mutex)
+		err = luo_retrieve_file(&session->file_set, argp->token, &file);
 	if (err < 0)
 		goto err_put_fd;
 
@@ -478,9 +477,8 @@ int luo_session_create(const char *name, struct file **filep)
 	if (err)
 		goto err_free;
 
-	mutex_lock(&session->mutex);
-	err = luo_session_getfile(session, filep);
-	mutex_unlock(&session->mutex);
+	scoped_guard(mutex, &session->mutex)
+		err = luo_session_getfile(session, filep);
 	if (err)
 		goto err_remove;
 	up_read(&luo_session_serialize_rwsem);
-- 
2.25.1