linux-kernel - [PATCH v4] tty: serial: ma35d1: Add a NULL check for of

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Message-Id: <20240625064128.127-1-ychuang570808@gmail.com>
Date: Tue, 25 Jun 2024 06:41:28 +0000
From: Jacky Huang <ychuang570808@...il.com>
To: dan.carpenter@...aro.org,
	gregkh@...uxfoundation.org,
	jirislaby@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Jacky Huang <ychuang3@...oton.com>
Subject: [PATCH v4] tty: serial: ma35d1: Add a NULL check for of_node

From: Jacky Huang <ychuang3@...oton.com>

The pdev->dev.of_node can be NULL if the "serial" node is absent.
Add a NULL check to return an error in such cases.

Fixes: 930cbf92db01 ("tty: serial: Add Nuvoton ma35d1 serial driver support")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/all/8df7ce45-fd58-4235-88f7-43fe7cd67e8f@moroto.mountain/
Signed-off-by: Jacky Huang <ychuang3@...oton.com>
---
  V3 -> V4: Move the version info lines to the correct position.
  V2 -> V3: Added the "Reported-by:" line.
  V1 -> V2: Added the "Fixes" line.

 drivers/tty/serial/ma35d1_serial.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/tty/serial/ma35d1_serial.c b/drivers/tty/serial/ma35d1_serial.c
index 19f0a305cc43..3b4206e815fe 100644
--- a/drivers/tty/serial/ma35d1_serial.c
+++ b/drivers/tty/serial/ma35d1_serial.c
@@ -688,12 +688,13 @@ static int ma35d1serial_probe(struct platform_device *pdev)
 	struct uart_ma35d1_port *up;
 	int ret = 0;
 
-	if (pdev->dev.of_node) {
-		ret = of_alias_get_id(pdev->dev.of_node, "serial");
-		if (ret < 0) {
-			dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", ret);
-			return ret;
-		}
+	if (!pdev->dev.of_node)
+		return -ENODEV;
+
+	ret = of_alias_get_id(pdev->dev.of_node, "serial");
+	if (ret < 0) {
+		dev_err(&pdev->dev, "failed to get alias/pdev id, errno %d\n", ret);
+		return ret;
 	}
 	up = &ma35d1serial_ports[ret];
 	up->port.line = ret;
-- 
2.34.1