From: Michael Olbrich <m.olbrich@pengutronix.de>
Date: Tue, 4 Oct 2016 14:15:37 +0000 (+0200)
Subject: list: LIST_INSERT_BEFORE: update head if necessary (#4261)
X-Git-Tag: v232.2~50
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=e4818ba5276510602ff5550a1e5a058fca51e9d4;hp=5d3c70eec7861aa623adeac659ac4a6f890557d2

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.
---

diff --git a/src/basic/list.h b/src/basic/list.h
index 5962aa421..c3771a177 100644
--- a/src/basic/list.h
+++ b/src/basic/list.h
@@ -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;                           \
                 }                                                       \