Fix it by myself.
diff --git a/kernel/drivers/usb/class/usblp.c b/kernel/drivers/usb/cl
index 9eca405..b528437 100755
--- a/kernel/drivers/usb/class/usblp.c
+++ b/kernel/drivers/usb/class/usblp.c
@@ -1046,8 +1046,13 @@ static const struct file_operations usblp_fops
.llseek = noop_llseek,
};
+static struct device_type printer_type = {
+ .name = "printer",
+};
+
static char *usblp_devnode(struct device *dev, mode_t *mode)
{
+ dev->type=&printer_type;
return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
}