From: Rolf Eike Beer <eike-kernel@sf-tec.de>
Date: Fri, 29 Sep 2006 09:00:46 +0000 (-0700)
Subject: [PATCH] Return better error codes if drivers/char/raw.c module init fails
X-Git-Tag: firefly_0821_release~33103
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=3e26a423e78c1bb1ebd29c49d4ae4ccbbacd861b;p=firefly-linux-kernel-4.4.55.git

[PATCH] Return better error codes if drivers/char/raw.c module init fails

Currently this module just returns 1 if anything on module init fails. Store
the error code of the different function calls and return their error on
problems.

Signed-off-by: Rolf Eike Beer <eike-kernel@sf-tec.de>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
[ Fixed to not unregister twice on error ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index 579868af4a54..c596a08c07b3 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -288,31 +288,34 @@ static struct cdev raw_cdev = {
 static int __init raw_init(void)
 {
 	dev_t dev = MKDEV(RAW_MAJOR, 0);
+	int ret;
 
-	if (register_chrdev_region(dev, MAX_RAW_MINORS, "raw"))
+	ret = register_chrdev_region(dev, MAX_RAW_MINORS, "raw");
+	if (ret)
 		goto error;
 
 	cdev_init(&raw_cdev, &raw_fops);
-	if (cdev_add(&raw_cdev, dev, MAX_RAW_MINORS)) {
+	ret = cdev_add(&raw_cdev, dev, MAX_RAW_MINORS);
+	if (ret) {
 		kobject_put(&raw_cdev.kobj);
-		unregister_chrdev_region(dev, MAX_RAW_MINORS);
-		goto error;
+		goto error_region;
 	}
 
 	raw_class = class_create(THIS_MODULE, "raw");
 	if (IS_ERR(raw_class)) {
 		printk(KERN_ERR "Error creating raw class.\n");
 		cdev_del(&raw_cdev);
-		unregister_chrdev_region(dev, MAX_RAW_MINORS);
-		goto error;
+		ret = PTR_ERR(raw_class);
+		goto error_region;
 	}
 	class_device_create(raw_class, NULL, MKDEV(RAW_MAJOR, 0), NULL, "rawctl");
 
 	return 0;
 
+error_region:
+	unregister_chrdev_region(dev, MAX_RAW_MINORS);
 error:
-	printk(KERN_ERR "error register raw device\n");
-	return 1;
+	return ret;
 }
 
 static void __exit raw_exit(void)