AI code review points out:

+static int hinic3_mac_filter_sync_hw(struct net_device *netdev,
+				     struct list_head *del_list,
+				     struct list_head *add_list,
+				     int *add_count)
+{
+	struct hinic3_mac_filter *ftmp;
+	struct hinic3_mac_filter *f;
+	int err;
+
+	if (!list_empty(del_list)) {
+		list_for_each_entry_safe(f, ftmp, del_list, list) {
+			/* ignore errors when deleting mac */
+			hinic3_filter_addr_unsync(netdev, f->addr);
+			list_del(&f->list);
+			kfree(f);
+		}
+	}
+
+	if (!list_empty(add_list)) {
+		list_for_each_entry_safe(f, ftmp, add_list, list) {
+			if (f->state != HINIC3_MAC_HW_SYNCING)
+				continue;
+
+			err = hinic3_filter_addr_sync(netdev, f->addr);
+			if (err) {
+				netdev_err(netdev, "Failed to add mac\n");
+				return err;
+			}
+
+			f->state = HINIC3_MAC_HW_SYNCED;
+			(*add_count)++;
+		}
+	}
+
+	return 0;
+}

[ ... ]

+	err = hinic3_mac_filter_sync_hw(netdev, &tmp_del_list,
+					&tmp_add_list, &add_count);
+	if (err) {
+		/* there were errors, delete all mac in hw */
+		hinic3_undo_add_filter_entries(mac_filter_list, &tmp_add_list);

[ ... ]

+		hinic3_mac_filter_sync_hw(netdev, &tmp_del_list,
+					  &tmp_add_list, NULL);

                                                  ^^^^

Can this NULL pointer dereference add_count in hinic3_mac_filter_sync_hw()?

When hinic3_filter_addr_sync() fails in the first call to
hinic3_mac_filter_sync_hw(), the function returns early with an error.
At that point tmp_add_list may still contain entries with state
HINIC3_MAC_HW_SYNCING (entries that were not yet processed).

The second call passes NULL for add_count. If tmp_add_list is not empty
and has entries with HINIC3_MAC_HW_SYNCING state, the code will execute
(*add_count)++ with add_count being NULL.