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 Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- drivers/tty/tty_port.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c index 4ddd9d6..c699d41 100644 --- a/drivers/tty/tty_port.c +++ b/drivers/tty/tty_port.c @@ -89,8 +89,7 @@ void tty_port_link_device(struct tty_port *port, { 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);