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samples/vfio-mdev/mtty: expand minor range when registering chrdev region

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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 13:59:32 +08:00 committed by Alex Williamson
parent 18bc04bc8a
commit 3e4835f7d7
1 changed files with 5 additions and 4 deletions
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9
samples/vfio-mdev/mtty.c
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@ -1442,7 +1442,8 @@ static int __init mtty_dev_init(void)
idr_init(&mtty_dev.vd_idr); 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) { if (ret < 0) {
pr_err("Error: failed to register mtty_dev, err:%d\n", ret); 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_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)); pr_info("major_number:%d\n", MAJOR(mtty_dev.vd_devt));
@ -1487,7 +1488,7 @@ static int __init mtty_dev_init(void)
failed1: failed1:
cdev_del(&mtty_dev.vd_cdev); 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: all_done:
return ret; return ret;
@ -1501,7 +1502,7 @@ static void __exit mtty_dev_exit(void)
device_unregister(&mtty_dev.dev); device_unregister(&mtty_dev.dev);
idr_destroy(&mtty_dev.vd_idr); idr_destroy(&mtty_dev.vd_idr);
cdev_del(&mtty_dev.vd_cdev); 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); class_destroy(mtty_dev.vd_class);
mtty_dev.vd_class = NULL; mtty_dev.vd_class = NULL;
pr_info("mtty_dev: Unloaded!\n"); pr_info("mtty_dev: Unloaded!\n");