diff options
| author | Chengguang Xu <cgxu519@gmx.com> | 2019-02-12 13:59:32 +0800 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2019-02-12 13:21:18 -0700 |
| commit | 3e4835f7d7a84ab022682aaeecaae5c508aeb76c (patch) | |
| tree | b64f07cab3b4dbf49e25dcb6f0c5046d066e6f9f /samples | |
| parent | 18bc04bc8a2aa95c33c6613c5fffc4d3535397f0 (diff) | |
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>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/vfio-mdev/mtty.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c index 19cd29071ab0..1c77c370c92f 100644 --- a/samples/vfio-mdev/mtty.c +++ b/samples/vfio-mdev/mtty.c @@ -1442,7 +1442,8 @@ static int __init mtty_dev_init(void) idr_init(&mtty_dev.vd_idr); - ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK, MTTY_NAME); + ret = alloc_chrdev_region(&mtty_dev.vd_devt, 0, MINORMASK + 1, + MTTY_NAME); if (ret < 0) { pr_err("Error: failed to register mtty_dev, err:%d\n", ret); @@ -1450,7 +1451,7 @@ static int __init mtty_dev_init(void) } cdev_init(&mtty_dev.vd_cdev, &vd_fops); - cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK); + cdev_add(&mtty_dev.vd_cdev, mtty_dev.vd_devt, MINORMASK + 1); pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt)); @@ -1487,7 +1488,7 @@ failed2: failed1: cdev_del(&mtty_dev.vd_cdev); - unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK); + unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1); all_done: return ret; @@ -1501,7 +1502,7 @@ static void __exit mtty_dev_exit(void) device_unregister(&mtty_dev.dev); idr_destroy(&mtty_dev.vd_idr); cdev_del(&mtty_dev.vd_cdev); - unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK); + unregister_chrdev_region(mtty_dev.vd_devt, MINORMASK + 1); class_destroy(mtty_dev.vd_class); mtty_dev.vd_class = NULL; pr_info("mtty_dev: Unloaded!\n"); |