net: pktgen: kill the "Wait for kthread_stop" code in pktgen_thread_w…

…orker() pktgen_thread_worker() doesn't need to wait for kthread_stop(), it can simply exit. Just pktgen_create_thread() and pg_net_exit() should do get_task_struct()/put_task_struct(). kthread_stop(dead_thread) is fine. Signed-off-by: Oleg Nesterov <[email protected]> Signed-off-by: David S. Miller <[email protected]>
cail · Jul 9, 2015 · 1fbe4b4 · 1fbe4b4
1 parent fecdf8b
commit 1fbe4b4
Showing 1 changed file with 2 additions and 9 deletions.
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
@@ -3571,15 +3571,6 @@ static int pktgen_thread_worker(void *arg)
 	pr_debug("%s removing thread\n", t->tsk->comm);
 	pktgen_rem_thread(t);
 
-	/* Wait for kthread_stop */
-	for (;;) {
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (kthread_should_stop())
-			break;
-		schedule();
-	}
-	__set_current_state(TASK_RUNNING);
-
 	return 0;
 }
 
@@ -3771,6 +3762,7 @@ static int __net_init pktgen_create_thread(int cpu, struct pktgen_net *pn)
 	}
 
 	t->net = pn;
+	get_task_struct(p);
 	wake_up_process(p);
 	wait_for_completion(&t->start_done);
 
@@ -3893,6 +3885,7 @@ static void __net_exit pg_net_exit(struct net *net)
 		t = list_entry(q, struct pktgen_thread, th_list);
 		list_del(&t->th_list);
 		kthread_stop(t->tsk);
+		put_task_struct(t->tsk);
 		kfree(t);
 	}