projects/linux·commit b70cc5fd

cgroups: clean up cgroup_pidlist_find() a bit

b70cc5fd · Li Zefan <[email protected]> · 2010-03-10 15:22:12 -08:00

Don't call get_pid_ns() before we locate/alloc the ns.

Signed-off-by: Li Zefan <[email protected]>
Cc: Serge Hallyn <[email protected]>
Acked-by: Paul Menage <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Commit
b70cc5fdb445a6929a01e9c406593265b136c99d
Parents
67523c48

Changes

1 files changed · +3 −5

FileStatusAddDelContent
kernel/cgroup.cmodified+3−5View file

kernel/cgroup.c

View file
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 521591d..1bf4d6d 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2597,7 +2597,8 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
{
struct cgroup_pidlist *l;
/* don't need task_nsproxy() if we're looking at ourself */
- struct pid_namespace *ns = get_pid_ns(current->nsproxy->pid_ns);
+ struct pid_namespace *ns = current->nsproxy->pid_ns;
+
/*
* We can't drop the pidlist_mutex before taking the l->mutex in case
* the last ref-holder is trying to remove l from the list at the same
@@ -2607,8 +2608,6 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
mutex_lock(&cgrp->pidlist_mutex);
list_for_each_entry(l, &cgrp->pidlists, links) {
if (l->key.type == type && l->key.ns == ns) {
- /* found a matching list - drop the extra refcount */
- put_pid_ns(ns);
/* make sure l doesn't vanish out from under us */
down_write(&l->mutex);
mutex_unlock(&cgrp->pidlist_mutex);
@@ -2619,13 +2618,12 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
l = kmalloc(sizeof(struct cgroup_pidlist), GFP_KERNEL);
if (!l) {
mutex_unlock(&cgrp->pidlist_mutex);
- put_pid_ns(ns);
return l;
}
init_rwsem(&l->mutex);
down_write(&l->mutex);
l->key.type = type;
- l->key.ns = ns;
+ l->key.ns = get_pid_ns(ns);
l->use_count = 0; /* don't increment here */
l->list = NULL;
l->owner = cgrp;