linux-kernel - [PATCH] tty: serdev: serdev-ttyport: set correct tty->dev for serdev framework

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Message-Id: <20230315072143.7815-1-sherry.sun@nxp.com>
Date:   Wed, 15 Mar 2023 15:21:43 +0800
From:   Sherry Sun <sherry.sun@....com>
To:     gregkh@...uxfoundation.org, jirislaby@...nel.org, robh@...nel.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-imx@....com
Subject: [PATCH] tty: serdev: serdev-ttyport: set correct tty->dev for serdev framework

ttyport_open() calls tty_init_dev() to initialize a tty device, but
tty_get_device() cannot get the correct tty->dev for serdev tty in
alloc_tty_struct(), because serdev framework does not set tty_class, so
class_find_device_by_devt(tty_class, devt) may always return NULL.

For serdev framework, we need to assign the correct ctrl->dev to
tty->dev.

Fixes: bed35c6dfa6a ("serdev: add a tty port controller driver")
Signed-off-by: Sherry Sun <sherry.sun@....com>
---
 drivers/tty/serdev/serdev-ttyport.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serdev/serdev-ttyport.c b/drivers/tty/serdev/serdev-ttyport.c
index d367803e2044..bba37ab90215 100644
--- a/drivers/tty/serdev/serdev-ttyport.c
+++ b/drivers/tty/serdev/serdev-ttyport.c
@@ -112,6 +112,7 @@ static int ttyport_open(struct serdev_controller *ctrl)
 	tty = tty_init_dev(serport->tty_drv, serport->tty_idx);
 	if (IS_ERR(tty))
 		return PTR_ERR(tty);
+	tty->dev = &ctrl->dev;
 	serport->tty = tty;
 
 	if (!tty->ops->open || !tty->ops->close) {
-- 
2.17.1