linux-kernel - [PATCH] drivers: char: scx200_gpio: check return value of cdev

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Message-ID: <Z_QDrlkYnmsVRe5w@pc>
Date: Mon, 7 Apr 2025 17:56:14 +0100
From: Salah Triki <salah.triki@...il.com>
To: Jim Cromie <jim.cromie@...il.com>, Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Cc: salah.triki@...il.com
Subject: [PATCH] drivers: char: scx200_gpio: check return value of cdev_add()

Check return value of cdev_add() and in case of error unregister the
range of device numbers.

Signed-off-by: Salah Triki <salah.triki@...il.com>
---
 drivers/char/scx200_gpio.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/char/scx200_gpio.c b/drivers/char/scx200_gpio.c
index 700e6affea6f..36efcc828e8e 100644
--- a/drivers/char/scx200_gpio.c
+++ b/drivers/char/scx200_gpio.c
@@ -107,10 +107,14 @@ static int __init scx200_gpio_init(void)
 	}
 
 	cdev_init(&scx200_gpio_cdev, &scx200_gpio_fileops);
-	cdev_add(&scx200_gpio_cdev, devid, MAX_PINS);
+	rc = cdev_add(&scx200_gpio_cdev, devid, MAX_PINS);
+	if (rc)
+		goto unregister_chrdev_region;
 
 	return 0; /* succeed */
 
+unregister_chrdev_region:
+	unregister_chrdev_region(devid, MAX_PINS);
 undo_platform_device_add:
 	platform_device_del(pdev);
 undo_malloc:
-- 
2.43.0