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@xxxxxxx>
---
samples/vfio-mdev/mtty.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index f6732aa16bb1..b9203a4fae12 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 @@ static int __init mtty_dev_init(void)
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");
--
2.20.1
