From 35ed4e75989c4e84a44b25569bbf09b98f923880 Mon Sep 17 00:00:00 2001
From: "David S. Miller" <davem@davemloft.net>
Date: Sat, 2 Aug 2008 23:25:50 -0700
Subject: mac80211: Use queue_lock() in ieee80211_ht_agg_queue_remove().

qdisc_root_lock() is only %100 safe to use when the RTNL
semaphore is held.

Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/mac80211/wme.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'net')

diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index 28437f0001db..4310e2f65661 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -241,12 +241,14 @@ void ieee80211_ht_agg_queue_remove(struct ieee80211_local *local,
 	} else {
 		struct netdev_queue *txq;
 		spinlock_t *root_lock;
+		struct Qdisc *q;
 
 		txq = netdev_get_tx_queue(local->mdev, agg_queue);
-		root_lock = qdisc_root_lock(txq->qdisc);
+		q = rcu_dereference(txq->qdisc);
+		root_lock = qdisc_lock(q);
 
 		spin_lock_bh(root_lock);
-		qdisc_reset(txq->qdisc);
+		qdisc_reset(q);
 		spin_unlock_bh(root_lock);
 	}
 }
-- 
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