[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 579868a..c596a08 100644 (file)
--- 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)