linux-kernel - [PATCH 1/3] serdev: ttyport: add devt for tty port

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Message-Id: <20200506072314.112409-2-tientzu@chromium.org>
Date:   Wed,  6 May 2020 15:23:12 +0800
From:   Claire Chang <tientzu@...omium.org>
To:     robh@...nel.org, gregkh@...uxfoundation.org, jslaby@...e.com,
        long.cheng@...iatek.com, changqi.hu@...iatek.com
Cc:     linux-serial@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Claire Chang <tientzu@...omium.org>
Subject: [PATCH 1/3] serdev: ttyport: add devt for tty port

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 <tientzu@...omium.org>
---
 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