diff mbox series

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

Message ID 151120276498.3159.10618037062400965499.stgit@localhost.localdomain
State Deferred, archived
Delegated to: David Miller
Headers show
Series Replacing net_mutex with rw_semaphore | expand

Commit Message

Kirill Tkhai Nov. 20, 2017, 6:32 p.m. UTC 
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 <ktkhai@virtuozzo.com>
---
 net/core/net_namespace.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
diff mbox series

Patch

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