samples/vfio-mdev/mtty: 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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@ -1442,7 +1442,8 @@ static int __init mtty_dev_init(void)
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idr_init(&mtty_dev.vd_idr);
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ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK, MTTY_NAME);
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ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK + 1,
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MTTY_NAME);
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if (ret < 0) {
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pr_err("Error: failed to register mtty_dev, err:%d\n", ret);
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@ -1450,7 +1451,7 @@ static int __init mtty_dev_init(void)
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}
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cdev_init(&mtty_dev.vd_cdev, &vd_fops);
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cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK);
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cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK + 1);
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pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt));
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@ -1487,7 +1488,7 @@ failed2:
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failed1:
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cdev_del(&mtty_dev.vd_cdev);
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unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK);
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unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1);
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all_done:
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return ret;
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@ -1501,7 +1502,7 @@ static void __exit mtty_dev_exit(void)
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device_unregister(&mtty_dev.dev);
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idr_destroy(&mtty_dev.vd_idr);
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cdev_del(&mtty_dev.vd_cdev);
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unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK);
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unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1);
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class_destroy(mtty_dev.vd_class);
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mtty_dev.vd_class = NULL;
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pr_info("mtty_dev: Unloaded!\n");
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