From 88e03493cc361628315cd4c948a6bfd01f1d3a45 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 9 Jan 2020 17:30:31 +0100
Subject: [PATCH] core: fix re-realization of cgroup siblings

This is a fix-up for eef85c4a3f8054d29383a176f6cebd1ef3a15b9a which
broke this.

Tracked down by @w-simon

Fixes: #14453
(cherry picked from commit 65f6b6bdcb500c576674b5838e4cc4c35e18bfde)

Related: #1824129
---
 src/core/cgroup.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 664d269483..3f7665b755 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -1796,32 +1796,25 @@ unsigned manager_dispatch_cgroup_realize_queue(Manager *m) {
 static void unit_add_siblings_to_cgroup_realize_queue(Unit *u) {
         Unit *slice;
 
-        /* This adds the siblings of the specified unit and the
-         * siblings of all parent units to the cgroup queue. (But
-         * neither the specified unit itself nor the parents.) */
+        /* This adds the siblings of the specified unit and the siblings of all parent units to the cgroup
+         * queue. (But neither the specified unit itself nor the parents.) */
 
         while ((slice = UNIT_DEREF(u->slice))) {
                 Iterator i;
                 Unit *m;
                 void *v;
 
-                HASHMAP_FOREACH_KEY(v, m, u->dependencies[UNIT_BEFORE], i) {
-                        if (m == u)
-                                continue;
-
-                        /* Skip units that have a dependency on the slice
-                         * but aren't actually in it. */
+                HASHMAP_FOREACH_KEY(v, m, slice->dependencies[UNIT_BEFORE], i) {
+                        /* Skip units that have a dependency on the slice but aren't actually in it. */
                         if (UNIT_DEREF(m->slice) != slice)
                                 continue;
 
-                        /* No point in doing cgroup application for units
-                         * without active processes. */
+                        /* No point in doing cgroup application for units without active processes. */
                         if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
                                 continue;
 
-                        /* If the unit doesn't need any new controllers
-                         * and has current ones realized, it doesn't need
-                         * any changes. */
+                        /* If the unit doesn't need any new controllers and has current ones realized, it
+                         * doesn't need any changes. */
                         if (unit_has_mask_realized(m,
                                                    unit_get_target_mask(m),
                                                    unit_get_enable_mask(m),