bsg: fix initialization error handling bugs

This fixes the following bugs and cleans up the initialization code:

- cdev_del is missing.
- unregister_chrdev_region should be used instead of unregister_chrdev.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/block/bsg.c b/block/bsg.c
index cdb00e5..b253784 100644 (file)
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -1057,39 +1057,37 @@ static int __init bsg_init(void)
 
        bsg_class = class_create(THIS_MODULE, "bsg");
        if (IS_ERR(bsg_class)) {
-               kmem_cache_destroy(bsg_cmd_cachep);
-               return PTR_ERR(bsg_class);
+               ret = PTR_ERR(bsg_class);
+               goto destroy_kmemcache;
        }
 
        ret = alloc_chrdev_region(&devid, 0, BSG_MAX_DEVS, "bsg");
-       if (ret) {
-               kmem_cache_destroy(bsg_cmd_cachep);
-               class_destroy(bsg_class);
-               return ret;
-       }
+       if (ret)
+               goto destroy_bsg_class;
 
        bsg_major = MAJOR(devid);
 
        cdev_init(&bsg_cdev, &bsg_fops);
        ret = cdev_add(&bsg_cdev, MKDEV(bsg_major, 0), BSG_MAX_DEVS);
-       if (ret) {
-               kmem_cache_destroy(bsg_cmd_cachep);
-               class_destroy(bsg_class);
-               unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS);
-               return ret;
-       }
+       if (ret)
+               goto unregister_chrdev;
 
        ret = scsi_register_interface(&bsg_intf);
-       if (ret) {
-               printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
-               kmem_cache_destroy(bsg_cmd_cachep);
-               class_destroy(bsg_class);
-               unregister_chrdev(bsg_major, "bsg");
-               return ret;
-       }
+       if (ret)
+               goto remove_cdev;
 
        printk(KERN_INFO "%s loaded (major %d)\n", bsg_version, bsg_major);
        return 0;
+remove_cdev:
+       printk(KERN_ERR "bsg: failed register scsi interface %d\n", ret);
+       cdev_del(&bsg_cdev);
+unregister_chrdev:
+       unregister_chrdev_region(MKDEV(bsg_major, 0), BSG_MAX_DEVS);
+destroy_bsg_class:
+       class_destroy(bsg_class);
+destroy_kmemcache:
+       kmem_cache_destroy(bsg_cmd_cachep);
+       return ret;
 }
 
 MODULE_AUTHOR("Jens Axboe");