diff options
| -rw-r--r-- | kernel/posix-cpu-timers.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c index 03c5d6c3e614..71a07699a36b 100644 --- a/kernel/posix-cpu-timers.c +++ b/kernel/posix-cpu-timers.c @@ -271,12 +271,22 @@ static int posix_cpu_clock_get_task(struct task_struct *tsk, if (same_thread_group(tsk, current)) err = cpu_clock_sample(which_clock, tsk, &rtn); } else { - read_lock(&tasklist_lock); + unsigned long flags; + struct sighand_struct *sighand; - if (tsk->sighand && (tsk == current || thread_group_leader(tsk))) + /* + * while_each_thread() is not yet entirely RCU safe, + * keep locking the group while sampling process + * clock for now. + */ + sighand = lock_task_sighand(tsk, &flags); + if (!sighand) + return err; + + if (tsk == current || thread_group_leader(tsk)) err = cpu_clock_sample_group(which_clock, tsk, &rtn); - read_unlock(&tasklist_lock); + unlock_task_sighand(tsk, &flags); } if (!err) |