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Commit 16355214 authored by Chengguang Xu's avatar Chengguang Xu Committed by Alex Williamson
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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: default avatarChengguang Xu <cgxu519@gmx.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 8bcb64a5

samples/vfio-mdev/mbochs.c

+4 −4
Original line number Diff line number Diff line
@@ -1448,13 +1448,13 @@ static int __init mbochs_dev_init(void) 
{

	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) {

		pr_err("Error: failed to register mbochs_dev, err: %d\n", ret);

		return ret;

	}

	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));



	mbochs_class = class_create(THIS_MODULE, MBOCHS_CLASS_NAME);
@@ -1483,7 +1483,7 @@ static int __init mbochs_dev_init(void) 
	class_destroy(mbochs_class);

failed1:

	cdev_del(&mbochs_cdev);

	unregister_chrdev_region(mbochs_devt, MINORMASK);

	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);

	return ret;

}
@@ -1494,7 +1494,7 @@ static void __exit mbochs_dev_exit(void) 


	device_unregister(&mbochs_dev);

	cdev_del(&mbochs_cdev);

	unregister_chrdev_region(mbochs_devt, MINORMASK);

	unregister_chrdev_region(mbochs_devt, MINORMASK + 1);

	class_destroy(mbochs_class);

	mbochs_class = NULL;

}