diff --git a/drivers/tty/n_hdlc.c b/drivers/tty/n_hdlc.c
index 4164414d4c64b266dfce58772241cb009363f4c0..8bdf42bc8fc817c9a0ac1278d2e89aeb7377ba0e 100644
--- a/drivers/tty/n_hdlc.c
+++ b/drivers/tty/n_hdlc.c
@@ -597,6 +597,7 @@ static ssize_t n_hdlc_tty_read(struct tty_struct *tty, struct file *file,
 				/* too large for caller's buffer */
 				ret = -EOVERFLOW;
 			} else {
+				__set_current_state(TASK_RUNNING);
 				if (copy_to_user(buf, rbuf->buf, rbuf->count))
 					ret = -EFAULT;
 				else