From 9fd7ce8ede4f5fcb730137d2593bfb8f470fad56 Mon Sep 17 00:00:00 2001
From: kircher <majun65@huawei.com>
Date: Tue, 21 Feb 2023 17:08:29 +0800
Subject: [PATCH] check and fix wakeup_list when null appears

---
 src/lstack/api/lstack_epoll.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/lstack/api/lstack_epoll.c b/src/lstack/api/lstack_epoll.c
index 7860163..da29590 100644
--- a/src/lstack/api/lstack_epoll.c
+++ b/src/lstack/api/lstack_epoll.c
@@ -84,6 +84,17 @@ void wakeup_stack_epoll(struct protocol_stack *stack, bool wakeup_thread_enable)
     struct list_node *node, *temp;
 
     list_for_each_safe(node, temp, &stack->wakeup_list) {
+        /* When temp is NULL, find the tail node in the wekeup_list and connect it to the back of the node */
+        if (unlikely(temp == NULL)) {
+            struct list_node *nod = &stack->wakeup_list;
+            while (nod->prev && nod->prev != node) {
+                nod = nod->prev;
+            }
+            nod->prev = node;
+            node->next = nod;
+            temp = nod;
+        }
+
         struct wakeup_poll *wakeup = container_of((node - stack->queue_id), struct wakeup_poll, wakeup_list);
 
         if (!wakeup_thread_enable) {
-- 
2.33.0