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 <cgxu...@gmx.com> --- drivers/misc/mei/main.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c index 87281b3695e6..3df54f1e1a8b 100644 --- a/drivers/misc/mei/main.c +++ b/drivers/misc/mei/main.c @@ -869,7 +869,7 @@ static const struct file_operations mei_fops = { static struct class *mei_class; static dev_t mei_devt; -#define MEI_MAX_DEVS MINORMASK +#define MEI_MAX_DEVS (MINORMASK + 1) static DEFINE_MUTEX(mei_minor_lock); static DEFINE_IDR(mei_idr); -- 2.20.1