diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index c9cf48b21f05..f62a568e84ec 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -235,16 +235,6 @@ out:
 	return retval;
 }
 
-static inline void __ptrace_detach(struct task_struct *child, unsigned int data)
-{
-	child->exit_code = data;
-	/* .. re-parent .. */
-	__ptrace_unlink(child);
-	/* .. and wake it up. */
-	if (child->exit_state != EXIT_ZOMBIE)
-		wake_up_process(child);
-}
-
 int ptrace_detach(struct task_struct *child, unsigned int data)
 {
 	if (!valid_signal(data))
@@ -254,10 +244,16 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
 	ptrace_disable(child);
 	clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
 
-	write_lock_irq(&tasklist_lock);
 	/* protect against de_thread()->release_task() */
-	if (child->ptrace)
-		__ptrace_detach(child, data);
+	write_lock_irq(&tasklist_lock);
+	if (child->ptrace) {
+		child->exit_code = data;
+
+		__ptrace_unlink(child);
+
+		if (!child->exit_state)
+			wake_up_process(child);
+	}
 	write_unlock_irq(&tasklist_lock);
 
 	return 0;