TOMOYO: Use RCU primitives for list operation

Replace list operation with RCU primitives and replace
down_read()/up_read() with srcu_read_lock()/srcu_read_unlock().

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 5 insertions, 3 deletions

diff --git a/security/tomoyo/realpath.c b/security/tomoyo/realpath.c
index e3c7aa0fb706..62363b3bc716 100644
--- a/security/tomoyo/realpath.c
+++ b/security/tomoyo/realpath.c
@@ -402,11 +402,13 @@ void __init tomoyo_realpath_init(void)
                 INIT_LIST_HEAD(&tomoyo_name_list[i]);
         INIT_LIST_HEAD(&tomoyo_kernel_domain.acl_info_list);
         tomoyo_kernel_domain.domainname = tomoyo_save_name(TOMOYO_ROOT_NAME);
-        list_add_tail(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
-        down_read(&tomoyo_domain_list_lock);
+        /*
+         * tomoyo_read_lock() is not needed because this function is
+         * called before the first "delete" request.
+         */
+        list_add_tail_rcu(&tomoyo_kernel_domain.list, &tomoyo_domain_list);
         if (tomoyo_find_domain(TOMOYO_ROOT_NAME) != &tomoyo_kernel_domain)
                 panic("Can't register tomoyo_kernel_domain");
-        up_read(&tomoyo_domain_list_lock);
 }
 
 /* Memory allocated for temporary purpose. */