Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_lock().

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To: Herbert Xu <herbert@...>
Cc: David Miller <davem@...>, <netdev@...>, <denys@...>
Date: Thursday, August 21, 2008 - 7:55 am

On Thu, Aug 21, 2008 at 09:26:09PM +1000, Herbert Xu wrote:

Sure, here is a scenario:

cpu1					cpu2
rtnl_lock()
qdisc_graft()
// parent != NULL
->cops-graft()
notify_and_destroy()			qdisc_run()
					spin_lock(root_lock)
qdisc_destroy(old)			dequeue_skb()
					tbf_dequeue()
					qdisc_tree_decrease_qlen()	
					qdisc_lookup()
//deleting from qdisc_sleeping->list	//walking qdisc_sleeping->list
//under rtnl_lock() only		//under qdisc root_lock only
list_del(qdisc->list)			list_for_each_entry(txq_root)


Jarek P.
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Messages in current thread:
[PATCH] pkt_sched: Destroy gen estimators under rtnl_lock()., Jarek Poplawski, (Mon Aug 11, 4:53 pm)
Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_loc..., Jarek Poplawski, (Thu Aug 21, 7:55 am)
[PATCH take 2] pkt_sched: Fix qdisc list locking, Jarek Poplawski, (Fri Aug 22, 5:27 am)
Re: [PATCH take 2] pkt_sched: Fix qdisc list locking, David Miller, (Fri Aug 22, 6:23 am)
Re: [PATCH take 2] pkt_sched: Fix qdisc list locking, Herbert Xu, (Fri Aug 22, 6:15 am)
Re: [PATCH take 2] pkt_sched: Fix qdisc list locking, David Miller, (Fri Aug 22, 6:28 am)
[PATCH] pkt_sched: Fix qdisc list locking, Jarek Poplawski, (Fri Aug 22, 4:41 am)
Re: [PATCH] pkt_sched: Fix qdisc list locking, Herbert Xu, (Fri Aug 22, 6:14 am)
Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_loc..., Stephen Hemminger, (Sun Aug 24, 7:26 pm)
Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_loc..., Stephen Hemminger, (Sun Aug 24, 8:29 pm)
Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_loc..., Stephen Hemminger, (Tue Aug 26, 8:24 am)
Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_loc..., Stephen Hemminger, (Tue Aug 26, 8:50 am)
RE: [PATCH take 2] pkt_sched: Fix qdisc_watchdog() vs. dev_d..., Duyck, Alexander H, (Mon Sep 15, 7:44 pm)
Re: [PATCH] pkt_sched: Destroy gen estimators under rtnl_loc..., Denys Fedoryshchenko, (Mon Aug 18, 2:08 am)