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samples/vfio-mdev/mdpy: expand minor range when registering chrdev region

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Actually, total amount of available minor number
for a single major is MINORMARK + 1. So expand
minor range when registering chrdev region.

Signed-off-by: Chengguang Xu <cgxu519@gmx.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Chengguang Xu 2019-02-12 13:59:31 +08:00 committed by Alex Williamson
parent 16355214a5
commit 18bc04bc8a
1 changed files with 4 additions and 4 deletions
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8
samples/vfio-mdev/mdpy.c
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@ -752,13 +752,13 @@ static int __init mdpy_dev_init(void)
{ {
int ret = 0; int ret = 0;
ret = alloc_chrdev_region(&mdpy_devt, 0, MINORMASK, MDPY_NAME); ret = alloc_chrdev_region(&mdpy_devt, 0, MINORMASK + 1, MDPY_NAME);
if (ret < 0) { if (ret < 0) {
pr_err("Error: failed to register mdpy_dev, err: %d\n", ret); pr_err("Error: failed to register mdpy_dev, err: %d\n", ret);
return ret; return ret;
} }
cdev_init(&mdpy_cdev, &vd_fops); cdev_init(&mdpy_cdev, &vd_fops);
cdev_add(&mdpy_cdev, mdpy_devt, MINORMASK); cdev_add(&mdpy_cdev, mdpy_devt, MINORMASK + 1);
pr_info("%s: major %d\n", __func__, MAJOR(mdpy_devt)); pr_info("%s: major %d\n", __func__, MAJOR(mdpy_devt));
mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME); mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME);
@ -787,7 +787,7 @@ failed2:
class_destroy(mdpy_class); class_destroy(mdpy_class);
failed1: failed1:
cdev_del(&mdpy_cdev); cdev_del(&mdpy_cdev);
unregister_chrdev_region(mdpy_devt, MINORMASK); unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
return ret; return ret;
} }
@ -798,7 +798,7 @@ static void __exit mdpy_dev_exit(void)
device_unregister(&mdpy_dev); device_unregister(&mdpy_dev);
cdev_del(&mdpy_cdev); cdev_del(&mdpy_cdev);
unregister_chrdev_region(mdpy_devt, MINORMASK); unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
class_destroy(mdpy_class); class_destroy(mdpy_class);
mdpy_class = NULL; mdpy_class = NULL;
} }