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staging: comedi: use centralized error clean-up in comedi_init()

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Centralize the "clean-up on error" handling in `comedi_init()` using
`goto` statements.  Also change some of the explicit `-EIO` return
values to the error return values from the failing functions as there is
no good reason to use `-EIO` explicitly.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2017-06-16 19:35:35 +01:00 committed by Greg Kroah-Hartman
parent a9332e9ad0
commit 125178d1eb
1 changed files with 22 additions and 21 deletions
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43
drivers/staging/comedi/comedi_fops.c
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@ -2881,29 +2881,25 @@ static int __init comedi_init(void)
retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS, "comedi");
if (retval)
return -EIO;
return retval;
cdev_init(&comedi_cdev, &comedi_fops);
comedi_cdev.owner = THIS_MODULE;
retval = kobject_set_name(&comedi_cdev.kobj, "comedi");
if (retval) {
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS);
return retval;
}
if (retval)
goto out_unregister_chrdev_region;
retval = cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS);
if (retval)
goto out_unregister_chrdev_region;
if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS);
return -EIO;
}
comedi_class = class_create(THIS_MODULE, "comedi");
if (IS_ERR(comedi_class)) {
retval = PTR_ERR(comedi_class);
pr_err("failed to create class\n");
cdev_del(&comedi_cdev);
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS);
return PTR_ERR(comedi_class);
goto out_cdev_del;
}
comedi_class->dev_groups = comedi_dev_groups;
@ -2914,12 +2910,8 @@ static int __init comedi_init(void)
dev = comedi_alloc_board_minor(NULL);
if (IS_ERR(dev)) {
comedi_cleanup_board_minors();
class_destroy(comedi_class);
cdev_del(&comedi_cdev);
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
COMEDI_NUM_MINORS);
return PTR_ERR(dev);
retval = PTR_ERR(dev);
goto out_cleanup_board_minors;
}
/* comedi_alloc_board_minor() locked the mutex */
mutex_unlock(&dev->mutex);
@ -2929,6 +2921,15 @@ static int __init comedi_init(void)
comedi_proc_init();
return 0;
out_cleanup_board_minors:
comedi_cleanup_board_minors();
class_destroy(comedi_class);
out_cdev_del:
cdev_del(&comedi_cdev);
out_unregister_chrdev_region:
unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
return retval;
}
module_init(comedi_init);