smb/server: fix session counter on session removal

See the procedure below:

  smb2_sess_setup
    ksmbd_smb2_session_create
      __session_create
        hash_add(sessions_table, &sess->hlist, sess->id)
        ksmbd_counter_inc(KSMBD_COUNTER_SESSIONS)
  ksmbd_conn_handler_loop
    ksmbd_server_terminate_conn
      ksmbd_sessions_deregister
        hash_del(&sess->hlist)
        // do not decrement KSMBD_COUNTER_SESSIONS

KSMBD_COUNTER_SESSIONS tracks sessions published in sessions_table, but
session removal does not decrement it. The value therefore keeps growing
after sessions are expired, rejected during registration, or removed on
the last channel disconnect.

Fixes: b38f99c1217a ("ksmbd: add procfs interface for runtime monitoring and statistics")
Signed-off-by: Ze Tan <tanze@kylinos.cn>
Reviewed-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions