net: hns3: add client node validity judgment

HNS3 driver can only unregister client which included in hnae3_client_list.
This patch adds the client node validity judgment.
Signed-off-by: Peng Li <lipeng321@huawei.com>
Signed-off-by: Huazhong Tan <tanhuazhong@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/hisilicon/hns3/hnae3.c

@@ -138,12 +138,28 @@ EXPORT_SYMBOL(hnae3_register_client);
 
 void hnae3_unregister_client(struct hnae3_client *client)
 {
+	struct hnae3_client *client_tmp;
 	struct hnae3_ae_dev *ae_dev;
+	bool existed = false;
 
 	if (!client)
 		return;
 
 	mutex_lock(&hnae3_common_lock);
+
+	list_for_each_entry(client_tmp, &hnae3_client_list, node) {
+		if (client_tmp->type == client->type) {
+			existed = true;
+			break;
+		}
+	}
+
+	if (!existed) {
+		mutex_unlock(&hnae3_common_lock);
+		pr_err("client %s does not exist!\n", client->name);
+		return;
+	}
+
 	/* un-initialize the client on every matched port */
 	list_for_each_entry(ae_dev, &hnae3_ae_dev_list, node) {
 		hnae3_uninit_client_instance(client, ae_dev);