[PATCH v2 04/31] net: Move mutex_unlock() in cleanup_net() up

[Kirill Tkhai]

net_sem protects from pernet_list changing, while
ops_free_list() makes simple kfree(), and it can't
race with other pernet_operations callbacks.

So we may release net_mutex earlier then it was.

Signed-off-by: Kirill Tkhai <ktk...@virtuozzo.com>
---
 net/core/net_namespace.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 859dce31e37e..c4f7452906bb 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -489,11 +489,12 @@ static void cleanup_net(struct work_struct *work)
        list_for_each_entry_reverse(ops, &pernet_list, list)
                ops_exit_list(ops, &net_exit_list);
 
+       mutex_unlock(&net_mutex);
+
        /* Free the net generic variables */
        list_for_each_entry_reverse(ops, &pernet_list, list)
                ops_free_list(ops, &net_exit_list);
 
-       mutex_unlock(&net_mutex);
        up_read(&net_sem);
 
        /* Ensure there are no outstanding rcu callbacks using this