linux-kernel - [PATCH v2 5/6] staging: pi433: Remove duplicated code using the "goto" error recovery scheme.

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Message-Id: <20240402111414.871089-6-ikobh7@gmail.com>
Date: Tue,  2 Apr 2024 14:14:13 +0300
From: Shahar Avidar <ikobh7@...il.com>
To: gregkh@...uxfoundation.org,
	hverkuil-cisco@...all.nl,
	andriy.shevchenko@...ux.intel.com,
	robh@...nel.org,
	felixkimbu1@...il.com
Cc: linux-staging@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 5/6] staging: pi433: Remove duplicated code using the "goto" error recovery scheme.

pi433_init had "unregister_chrdev" called twice.
Remove it using goto statements.

Signed-off-by: Shahar Avidar <ikobh7@...il.com>
---
v2->v1:
Followed by Dan Carpenter's <dan.carpenter@...aro.org> comments:
        - Remove empty "fail" goto tag.
        - Reorder pi433 init & exit calls so they have reverse order.
        - Add "unreg_spi_drv" goto tag.
        - Check "debugfs_create_dir" return value.
        - Update "if" statments for consistency.

 drivers/staging/pi433/pi433_if.c | 33 +++++++++++++++++++-------------
 1 file changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
index 62ce75b07bf0..47e0c51ffe2e 100644
--- a/drivers/staging/pi433/pi433_if.c
+++ b/drivers/staging/pi433/pi433_if.c
@@ -1399,25 +1399,32 @@ static int __init pi433_init(void)
 	 * Last, register the driver which manages those device numbers.
 	 */
 	status = alloc_chrdev_region(&pi433_devt, 0, N_PI433_MINORS, "pi433");
-	if (status < 0)
+	if (status)
 		return status;
 
 	status = class_register(&pi433_class);
-	if (status) {
-		unregister_chrdev(MAJOR(pi433_devt),
-				  pi433_spi_driver.driver.name);
-		return status;
-	}
-
-	root_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (status)
+		goto unreg_chrdev;
 
 	status = spi_register_driver(&pi433_spi_driver);
-	if (status < 0) {
-		class_unregister(&pi433_class);
-		unregister_chrdev(MAJOR(pi433_devt),
-				  pi433_spi_driver.driver.name);
+	if (status)
+		goto unreg_class;
+
+	root_dir = debugfs_create_dir(KBUILD_MODNAME, NULL);
+	if (IS_ERR(root_dir)) {
+		status = PTR_ERR(root_dir);
+		goto unreg_spi_drv;
 	}
 
+	return 0;
+
+unreg_spi_drv:
+	spi_unregister_driver(&pi433_spi_driver);
+unreg_class:
+	class_unregister(&pi433_class);
+unreg_chrdev:
+	unregister_chrdev(MAJOR(pi433_devt), pi433_spi_driver.driver.name);
+
 	return status;
 }
 
@@ -1425,10 +1432,10 @@ module_init(pi433_init);
 
 static void __exit pi433_exit(void)
 {
+	debugfs_remove(root_dir);
 	spi_unregister_driver(&pi433_spi_driver);
 	class_unregister(&pi433_class);
 	unregister_chrdev(MAJOR(pi433_devt), pi433_spi_driver.driver.name);
-	debugfs_remove(root_dir);
 }
 module_exit(pi433_exit);
 
-- 
2.34.1