samples/vfio-mdev/mbochs: 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>
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@ -1448,13 +1448,13 @@ static int __init mbochs_dev_init(void)
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{
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int ret = 0;
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ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK, MBOCHS_NAME);
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ret = alloc_chrdev_region(&mbochs_devt, 0, MINORMASK + 1, MBOCHS_NAME);
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if (ret < 0) {
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pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);
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return ret;
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}
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cdev_init(&mbochs_cdev, &vd_fops);
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cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK);
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cdev_add(&mbochs_cdev, mbochs_devt, MINORMASK + 1);
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pr_info("%s: major %d\n", __func__, MAJOR(mbochs_devt));
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mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
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@ -1483,7 +1483,7 @@ failed2:
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class_destroy(mbochs_class);
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failed1:
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cdev_del(&mbochs_cdev);
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unregister_chrdev_region(mbochs_devt, MINORMASK);
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unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
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return ret;
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}
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@ -1494,7 +1494,7 @@ static void __exit mbochs_dev_exit(void)
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device_unregister(&mbochs_dev);
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cdev_del(&mbochs_cdev);
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unregister_chrdev_region(mbochs_devt, MINORMASK);
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unregister_chrdev_region(mbochs_devt, MINORMASK + 1);
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class_destroy(mbochs_class);
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mbochs_class = NULL;
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}
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