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vfio: 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>
This commit is contained in:
Chengguang Xu 2019-02-12 13:59:29 +08:00 committed by Alex Williamson
parent 3c8d7ef89b
commit 8bcb64a510
1 changed files with 4 additions and 4 deletions
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8
drivers/vfio/vfio.c
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@ -2219,12 +2219,12 @@ static int __init vfio_init(void)
vfio.class->devnode = vfio_devnode;
ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK, "vfio");
ret = alloc_chrdev_region(&vfio.group_devt, 0, MINORMASK + 1, "vfio");
if (ret)
goto err_alloc_chrdev;
cdev_init(&vfio.group_cdev, &vfio_group_fops);
ret = cdev_add(&vfio.group_cdev, vfio.group_devt, MINORMASK);
ret = cdev_add(&vfio.group_cdev, vfio.group_devt, MINORMASK + 1);
if (ret)
goto err_cdev_add;
@ -2236,7 +2236,7 @@ static int __init vfio_init(void)
return 0;
err_cdev_add:
unregister_chrdev_region(vfio.group_devt, MINORMASK);
unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
err_alloc_chrdev:
class_destroy(vfio.class);
vfio.class = NULL;
@ -2254,7 +2254,7 @@ static void __exit vfio_cleanup(void)
#endif
idr_destroy(&vfio.group_idr);
cdev_del(&vfio.group_cdev);
unregister_chrdev_region(vfio.group_devt, MINORMASK);
unregister_chrdev_region(vfio.group_devt, MINORMASK + 1);
class_destroy(vfio.class);
vfio.class = NULL;
misc_deregister(&vfio_dev);