list: LIST_INSERT_BEFORE: update head if necessary (#4261)

If the new item is inserted before the first item in the list, then the head must be updated as well. Add a test to the list unit test to check for this.
2016-10-04 16:15:37 +02:00
parent c080fbce9c
commit 5076f4219e
2 changed files with 25 additions and 0 deletions
@@ -142,6 +142,8 @@
                } else {                                                \
                        if ((_b->name##_prev = _a->name##_prev))        \
                                _b->name##_prev->name##_next = _b;      \
+                        else                                            \
+                                *_head = _b;                            \
                        _b->name##_next = _a;                           \
                        _a->name##_prev = _b;                           \
                }                                                       \