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Commit 18bc04bc authored by Chengguang Xu's avatar Chengguang Xu Committed by Alex Williamson
Browse files

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: default avatarChengguang Xu <cgxu519@gmx.com>
Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent 16355214

samples/vfio-mdev/mdpy.c

+4 −4
Original line number Diff line number Diff line
@@ -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 @@ static int __init mdpy_dev_init(void) 
	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;

}