serdev: ttyport: fix tty locking in close
Make sure to hold the tty lock as required when calling tty-driver close() (e.g. to avoid racing with hangup()). Note that the serport active flag is currently set under the lock at controller open, but really isn't protected by it. Fixes: cd6484e1 ("serdev: Introduce new bus for serial attached devices") Signed-off-by: NJohan Hovold <johan@kernel.org> Cc: stable <stable@vger.kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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