Don't Call get_pid_ns() before we locate/alloc the ns.
Signed-off-by: Li Zefan <lizf@xxxxxxxxxxxxxx>
---
cgroup.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
--- a/kernel/cgroup.c.orig 2010-01-26 14:24:29.000000000 +0800
+++ a/kernel/cgroup.c 2010-01-26 14:24:44.000000000 +0800
@@ -2643,7 +2643,8 @@ static struct cgroup_pidlist *cgroup_pid
{
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
@@ -2653,8 +2654,6 @@ static struct cgroup_pidlist *cgroup_pid
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);
@@ -2665,13 +2664,12 @@ static struct cgroup_pidlist *cgroup_pid
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;
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