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-rw-r--r--kernel/posix-cpu-timers.c28
1 files changed, 11 insertions, 17 deletions
diff --git a/kernel/posix-cpu-timers.c b/kernel/posix-cpu-timers.c
index 7a51a55..b3f3edc 100644
--- a/kernel/posix-cpu-timers.c
+++ b/kernel/posix-cpu-timers.c
@@ -387,25 +387,19 @@ int posix_cpu_timer_del(struct k_itimer *timer)
if (unlikely(p == NULL))
return 0;
+ spin_lock(&p->sighand->siglock);
if (!list_empty(&timer->it.cpu.entry)) {
- read_lock(&tasklist_lock);
- if (unlikely(p->signal == NULL)) {
- /*
- * We raced with the reaping of the task.
- * The deletion should have cleared us off the list.
- */
- BUG_ON(!list_empty(&timer->it.cpu.entry));
- } else {
- /*
- * Take us off the task's timer list.
- */
- spin_lock(&p->sighand->siglock);
- list_del(&timer->it.cpu.entry);
- spin_unlock(&p->sighand->siglock);
- }
- read_unlock(&tasklist_lock);
+ /*
+ * Take us off the task's timer list. We don't need to
+ * take tasklist_lock and check for the task being reaped.
+ * If it was reaped, it already called posix_cpu_timers_exit
+ * and posix_cpu_timers_exit_group to clear all the timers
+ * that pointed to it.
+ */
+ list_del(&timer->it.cpu.entry);
+ put_task_struct(p);
}
- put_task_struct(p);
+ spin_unlock(&p->sighand->siglock);
return 0;
}