Subject: [PATCH 2/5] mac80211: Use rcu_barrier() on unload.

From: Jesper Dangaard Brouer <[email-masked]>
Date: Fri, 26 Jun 2009 22:45:53 +0200

The mac80211 module uses rcu_call() thus it should use rcu_barrier()
on module unload.

The rcu_barrier() is placed in mech.c ieee80211_stop_mesh() which is
invoked from ieee80211_stop() in case vif.type == NL80211_IFTYPE_MESH_POINT.

Acked-by: Paul E. McKenney <[email-masked]>
Acked-by: Johannes Berg <[email-masked]>
Signed-off-by: Jesper Dangaard Brouer <[email-masked]>
---

 net/mac80211/mesh.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/mac80211/mesh.c b/net/mac80211/mesh.c
index fc712e6..11cf45b 100644
--- a/net/mac80211/mesh.c
+++ b/net/mac80211/mesh.c
@@ -494,7 +494,7 @@ void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 	 * should it be using the interface and enqueuing
 	 * frames at this very time on another CPU.
 	 */
-	synchronize_rcu();
+	rcu_barrier(); /* Wait for RX path and call_rcu()'s */
 	skb_queue_purge(&sdata->u.mesh.skb_queue);
 }