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

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>

diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index 96e7969c473aa47bc6ff597771b3934d20244f9d..cc86bf6566e42aa4326c45f34d10592041133510 100644 (file)
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -752,13 +752,13 @@ static int __init mdpy_dev_init(void)
 {
        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) {
                pr_err("Error: failed to register mdpy_dev, err: %d\n", ret);
                return ret;
        }
        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));
 
        mdpy_class = class_create(THIS_MODULE, MDPY_CLASS_NAME);
@@ -787,7 +787,7 @@ failed2:
        class_destroy(mdpy_class);
 failed1:
        cdev_del(&mdpy_cdev);
-       unregister_chrdev_region(mdpy_devt, MINORMASK);
+       unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
        return ret;
 }
 
@@ -798,7 +798,7 @@ static void __exit mdpy_dev_exit(void)
 
        device_unregister(&mdpy_dev);
        cdev_del(&mdpy_cdev);
-       unregister_chrdev_region(mdpy_devt, MINORMASK);
+       unregister_chrdev_region(mdpy_devt, MINORMASK + 1);
        class_destroy(mdpy_class);
        mdpy_class = NULL;
 }