serial_match_port() uses devt to match devices. However, when serdev registers a tty port, devt has never been set. This makes device_find_child() always return NULL.
Assign devt in serdev_tty_port_register() to fix this. Signed-off-by: Claire Chang <[email protected]> --- drivers/tty/serdev/serdev-ttyport.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c index d367803e2044f..9238119173a47 100644 --- a/drivers/tty/serdev/serdev-ttyport.c +++ b/drivers/tty/serdev/serdev-ttyport.c @@ -267,6 +267,7 @@ struct device *serdev_tty_port_register(struct tty_port *port, { struct serdev_controller *ctrl; struct serport *serport; + dev_t devt = MKDEV(drv->major, drv->minor_start) + idx; int ret; if (!port || !drv || !parent) @@ -282,6 +283,7 @@ struct device *serdev_tty_port_register(struct tty_port *port, serport->tty_drv = drv; ctrl->ops = &ctrl_ops; + ctrl->dev.devt = devt; port->client_ops = &client_ops; port->client_data = ctrl; -- 2.26.2.526.g744177e7f7-goog
