From: Sudip Mukherjee sudipm.mukherjee@gmail.com
commit 273f632912f1b24b642ba5b7eb5022e43a72f3b5 upstream.
If the serial device is disconnected and reconnected, it re-enumerates properly but does not link it. fwiw, linking means just saving the port index, so allow it always as there is no harm in saving the same value again even if it tries to relink with the same port.
Fixes: fb2b90014d78 ("tty: link tty and port before configuring it as console") Reported-by: Kenneth R. Crudup kenny@panix.com Signed-off-by: Sudip Mukherjee sudipm.mukherjee@gmail.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/20191227174434.12057-1-sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/tty/tty_port.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -88,8 +88,7 @@ void tty_port_link_device(struct tty_por { if (WARN_ON(index >= driver->num)) return; - if (!driver->ports[index]) - driver->ports[index] = port; + driver->ports[index] = port; } EXPORT_SYMBOL_GPL(tty_port_link_device);