TOMOYO: Remove redundant tasklist_lock.

rcu_read_lock() is sufficient for calling find_task_by_pid_ns()/find_task_by_vpid().

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 0 insertions, 4 deletions

diff --git a/security/tomoyo/common.c b/security/tomoyo/common.c
index 2e2802060eef..365f3bddee79 100644
--- a/security/tomoyo/common.c
+++ b/security/tomoyo/common.c
@@ -984,14 +984,12 @@ static bool tomoyo_select_domain(struct tomoyo_io_buffer *head,
             (global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) {
                 struct task_struct *p;
                 rcu_read_lock();
-                read_lock(&tasklist_lock);
                 if (global_pid)
                         p = find_task_by_pid_ns(pid, &init_pid_ns);
                 else
                         p = find_task_by_vpid(pid);
                 if (p)
                         domain = tomoyo_real_domain(p);
-                read_unlock(&tasklist_lock);
                 rcu_read_unlock();
         } else if (!strncmp(data, "domain=", 7)) {
                 if (tomoyo_domain_def(data + 7))
@@ -1664,14 +1662,12 @@ static void tomoyo_read_pid(struct tomoyo_io_buffer *head)
                 global_pid = true;
         pid = (unsigned int) simple_strtoul(buf, NULL, 10);
         rcu_read_lock();
-        read_lock(&tasklist_lock);
         if (global_pid)
                 p = find_task_by_pid_ns(pid, &init_pid_ns);
         else
                 p = find_task_by_vpid(pid);
         if (p)
                 domain = tomoyo_real_domain(p);
-        read_unlock(&tasklist_lock);
         rcu_read_unlock();
         if (!domain)
                 return;