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cgroup: list_del_init() on removed events 

Use list_del_init() rather than list_del() to remove events from
cgrp->event_list.  No functional change.  This is just defensive
coding.

Signed-off-by: Greg Thelen <gthelen@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Greg Thelen 2012-11-28 13:50:45 -08:00 committed by Tejun Heo
parent 205a872bd6
commit 9718ceb343
1 changed files with 2 additions and 2 deletions
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4
kernel/cgroup.c
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@ -3767,7 +3767,7 @@ static int cgroup_event_wake(wait_queue_t *wait, unsigned mode,
if (flags & POLLHUP) {
__remove_wait_queue(event->wqh, &event->wait);
spin_lock(&cgrp->event_list_lock);
list_del(&event->list);
list_del_init(&event->list);
spin_unlock(&cgrp->event_list_lock);
/*
* We are in atomic context, but cgroup_event_remove() may
@ -4341,7 +4341,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
list_splice_init(&cgrp->event_list, &tmp_list);
spin_unlock(&cgrp->event_list_lock);
list_for_each_entry_safe(event, tmp, &tmp_list, list) {
list_del(&event->list);
list_del_init(&event->list);
remove_wait_queue(event->wqh, &event->wait);
eventfd_signal(event->eventfd, 1);
schedule_work(&event->remove);