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samples/vfio-mdev/mbochs: 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 13:59:30 +08:00 • committed by Alex Williamson
parent 8bcb64a510
commit 16355214a5
1 changed files with 4 additions and 4 deletions
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8
samples/vfio-mdev/mbochs.c
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@ -1448,13 +1448,13 @@ static int __init mbochs_dev_init(void)
{ {
int ret = 0; int ret = 0;
ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK, MBOCHS_NAME); ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
if (ret < 0) { if (ret < 0) {
pr_err("Error: failed to register mbochs_dev, err: %d\n", ret); pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
return ret; return ret;
} }
cdev_init(&mbochs_cdev, &vd_fops); cdev_init(&mbochs_cdev, &vd_fops);
cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK); cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt)); pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME); mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
@ -1483,7 +1483,7 @@ failed2:
class_destroy(mbochs_class); class_destroy(mbochs_class);
failed1: failed1:
cdev_del(&mbochs_cdev); cdev_del(&mbochs_cdev);
unregister_chrdev_region(mbochs_devt, MINORMASK); unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
return ret; return ret;
} }
@ -1494,7 +1494,7 @@ static void __exit mbochs_dev_exit(void)
device_unregister(&mbochs_dev); device_unregister(&mbochs_dev);
cdev_del(&mbochs_cdev); cdev_del(&mbochs_cdev);
unregister_chrdev_region(mbochs_devt, MINORMASK); unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
class_destroy(mbochs_class); class_destroy(mbochs_class);
mbochs_class = NULL; mbochs_class = NULL;
} }