linux-kernel - [PATCH v2] usb: misc: usb3503: Fix logic in usb3503

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Message-Id: <a8547f6fe698014df08cad3bcc9c5d9a7137d8b8.1612873935.git.michal.simek@xilinx.com>
Date:   Tue,  9 Feb 2021 13:32:19 +0100
From:   Michal Simek <michal.simek@...inx.com>
To:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com,
        Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Paul Cercueil <paul@...pouillou.net>, linux-usb@...r.kernel.org
Subject: [PATCH v2] usb: misc: usb3503: Fix logic in usb3503_init()

Based on
https://lore.kernel.org/linux-arm-kernel/YCJv59g3Tq2haDSa@kroah.com/
initialization should fail if any registration fails.

Signed-off-by: Michal Simek <michal.simek@...inx.com>
---

Changes in v2:
- Also remove i2c driver when platform driver registration failed.

 drivers/usb/misc/usb3503.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c
index 48099c6bf04c..330f494cd158 100644
--- a/drivers/usb/misc/usb3503.c
+++ b/drivers/usb/misc/usb3503.c
@@ -409,13 +409,18 @@ static int __init usb3503_init(void)
 	int err;
 
 	err = i2c_add_driver(&usb3503_i2c_driver);
-	if (err != 0)
+	if (err) {
 		pr_err("usb3503: Failed to register I2C driver: %d\n", err);
+		return err;
+	}
 
 	err = platform_driver_register(&usb3503_platform_driver);
-	if (err != 0)
+	if (err) {
 		pr_err("usb3503: Failed to register platform driver: %d\n",
 		       err);
+		i2c_del_driver(&usb3503_i2c_driver);
+		return err;
+	}
 
 	return 0;
 }
-- 
2.30.0