On 2024-01-23, Junxiao Chang <junxiao.chang@xxxxxxxxx> wrote: > Try to release nbcon only if current uart port is nbcon, as it does > in nbcon_acquire. The release needs to undo what acquire did. Why should it have its own checks that would cause it to _not_ undo what acquire did? Keep in mind that an nbcon console could be unregistered while another CPU is holding the nbcon lock. The port lock (and nbcon lock) are protecting access to the hardware. They are not related to console registration/unregistration. John
