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From ca843e40587fb87fe20bd0561b6ccb42aaafc4ab Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Thu, 9 Jan 2020 17:30:31 +0100
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Subject: [PATCH] core: fix re-realization of cgroup siblings
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This is a fix-up for eef85c4a3f8054d29383a176f6cebd1ef3a15b9a which
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broke this.
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Tracked down by @w-simon
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Fixes: #14453
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(cherry picked from commit 65f6b6bdcb500c576674b5838e4cc4c35e18bfde)
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Related: #1818054
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---
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 src/core/cgroup.c | 21 +++++++--------------
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 1 file changed, 7 insertions(+), 14 deletions(-)
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diff --git a/src/core/cgroup.c b/src/core/cgroup.c
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index 664d269483..3f7665b755 100644
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--- a/src/core/cgroup.c
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+++ b/src/core/cgroup.c
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@@ -1796,32 +1796,25 @@ unsigned manager_dispatch_cgroup_realize_queue(Manager *m) {
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 static void unit_add_siblings_to_cgroup_realize_queue(Unit *u) {
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         Unit *slice;
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-        /* This adds the siblings of the specified unit and the
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-         * siblings of all parent units to the cgroup queue. (But
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-         * neither the specified unit itself nor the parents.) */
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+        /* This adds the siblings of the specified unit and the siblings of all parent units to the cgroup
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+         * queue. (But neither the specified unit itself nor the parents.) */
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         while ((slice = UNIT_DEREF(u->slice))) {
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                 Iterator i;
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                 Unit *m;
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                 void *v;
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-                HASHMAP_FOREACH_KEY(v, m, u->dependencies[UNIT_BEFORE], i) {
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-                        if (m == u)
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-                                continue;
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-
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-                        /* Skip units that have a dependency on the slice
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-                         * but aren't actually in it. */
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+                HASHMAP_FOREACH_KEY(v, m, slice->dependencies[UNIT_BEFORE], i) {
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+                        /* Skip units that have a dependency on the slice but aren't actually in it. */
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                         if (UNIT_DEREF(m->slice) != slice)
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                                 continue;
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-                        /* No point in doing cgroup application for units
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-                         * without active processes. */
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+                        /* No point in doing cgroup application for units without active processes. */
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                         if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
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                                 continue;
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-                        /* If the unit doesn't need any new controllers
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-                         * and has current ones realized, it doesn't need
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-                         * any changes. */
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+                        /* If the unit doesn't need any new controllers and has current ones realized, it
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+                         * doesn't need any changes. */
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                         if (unit_has_mask_realized(m,
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                                                    unit_get_target_mask(m),
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                                                    unit_get_enable_mask(m),