linux-kernel - [PATCH 2/4] pktgen: make sure that pktgen_thread

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Date:	Tue, 20 May 2008 20:30:22 +0200
From:	Robert Olsson <Robert.Olsson@...a.slu.se>
To:	"Denis V. Lunev" <den@...nvz.org>
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
	Robert Olsson <robert.olsson@....uu.se>,
	Ben Greear <greearb@...delatech.com>
Subject: [PATCH 2/4] pktgen: make sure that pktgen_thread_worker has been executed


Denis V. Lunev writes:

 > The problem is that pktgen_thread_worker can not be executed if kthread_stop
 > has been called too early. Insert a completion on the normal initialization
 > path to make sure that pktgen_thread_worker will gain the control for sure.


 Yes how about if we move the wait_for_completion() to pg_cleanup before
 we remove the threads. And move the complete() last in pktgen_thread_worker. 
 This completion would sync with both start and stop.

 Cheers.
					--ro


 > diff --git a/net/core/pktgen.c b/net/core/pktgen.c
 > index 8dca211..fdf5377 100644
 > --- a/net/core/pktgen.c
 > +++ b/net/core/pktgen.c
 > @@ -390,6 +390,7 @@ struct pktgen_thread {
 >  	int cpu;
 >  
 >  	wait_queue_head_t queue;
 > +	struct completion start_done;
 >  };
 >  
 >  #define REMOVE 1
 > @@ -3414,6 +3415,7 @@ static int pktgen_thread_worker(void *arg)
 >  	BUG_ON(smp_processor_id() != cpu);
 >  
 >  	init_waitqueue_head(&t->queue);
 > +	complete(&t->start_done);
 >  
 >  	pr_debug("pktgen: starting pktgen/%d:  pid=%d\n", cpu, task_pid_nr(current));
 >  
 > @@ -3615,6 +3617,7 @@ static int __init pktgen_create_thread(int cpu)
 >  	INIT_LIST_HEAD(&t->if_list);
 >  
 >  	list_add_tail(&t->th_list, &pktgen_threads);
 > +	init_completion(&t->start_done);
 >  
 >  	p = kthread_create(pktgen_thread_worker, t, "kpktgend_%d", cpu);
 >  	if (IS_ERR(p)) {
 > @@ -3639,6 +3642,7 @@ static int __init pktgen_create_thread(int cpu)
 >  	}
 >  
 >  	wake_up_process(p);
 > +	wait_for_completion(&t->start_done);
 >  
 >  	return 0;
 >  }
 > -- 
 > 1.5.3.rc5
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