net: hns3: add pointer checking at the beginning of the exported functions.

These functions are exported, add pointer checking at the beginning
can make them more safe.
Signed-off-by: Yonglong Liu <liuyonglong@huawei.com>
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

@@ -32,6 +32,9 @@ static bool hnae3_client_match(enum hnae3_client_type client_type,
 void hnae3_set_client_init_flag(struct hnae3_client *client,
 				struct hnae3_ae_dev *ae_dev, int inited)
 {
+	if (!client || !ae_dev)
+		return;
+
 	switch (client->type) {
 	case HNAE3_CLIENT_KNIC:
 		hnae3_set_bit(ae_dev->flag, HNAE3_KNIC_CLIENT_INITED_B, inited);
@@ -109,6 +112,9 @@ int hnae3_register_client(struct hnae3_client *client)
 	struct hnae3_ae_dev *ae_dev;
 	int ret = 0;
 
+	if (!client)
+		return -ENODEV;
+
 	mutex_lock(&hnae3_common_lock);
 	/* one system should only have one client for every type */
 	list_for_each_entry(client_tmp, &hnae3_client_list, node) {
@@ -141,6 +147,9 @@ void hnae3_unregister_client(struct hnae3_client *client)
 {
 	struct hnae3_ae_dev *ae_dev;
 
+	if (!client)
+		return;
+
 	mutex_lock(&hnae3_common_lock);
 	/* un-initialize the client on every matched port */
 	list_for_each_entry(ae_dev, &hnae3_ae_dev_list, node) {
@@ -163,6 +172,9 @@ void hnae3_register_ae_algo(struct hnae3_ae_algo *ae_algo)
 	struct hnae3_client *client;
 	int ret = 0;
 
+	if (!ae_algo)
+		return;
+
 	mutex_lock(&hnae3_common_lock);
 
 	list_add_tail(&ae_algo->node, &hnae3_ae_algo_list);
@@ -209,6 +221,9 @@ void hnae3_unregister_ae_algo(struct hnae3_ae_algo *ae_algo)
 	struct hnae3_ae_dev *ae_dev;
 	struct hnae3_client *client;
 
+	if (!ae_algo)
+		return;
+
 	mutex_lock(&hnae3_common_lock);
 	/* Check if there are matched ae_dev */
 	list_for_each_entry(ae_dev, &hnae3_ae_dev_list, node) {
@@ -245,6 +260,9 @@ int hnae3_register_ae_dev(struct hnae3_ae_dev *ae_dev)
 	struct hnae3_client *client;
 	int ret = 0;
 
+	if (!ae_dev)
+		return -ENODEV;
+
 	mutex_lock(&hnae3_common_lock);
 
 	list_add_tail(&ae_dev->node, &hnae3_ae_dev_list);
@@ -307,6 +325,9 @@ void hnae3_unregister_ae_dev(struct hnae3_ae_dev *ae_dev)
 	struct hnae3_ae_algo *ae_algo;
 	struct hnae3_client *client;
 
+	if (!ae_dev)
+		return;
+
 	mutex_lock(&hnae3_common_lock);
 	/* Check if there are matched ae_algo */
 	list_for_each_entry(ae_algo, &hnae3_ae_algo_list, node) {