linux-kernel - [PATCH 03/10] mac80211: Use rcu

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Message-ID: <20090623150409.22490.99106.stgit@localhost>
Date:	Tue, 23 Jun 2009 17:04:09 +0200
From:	Jesper Dangaard Brouer <hawk@...x.dk>
To:	"David S. Miller" <davem@...emloft.net>
Cc:	Jesper Dangaard Brouer <hawk@...x.dk>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	dougthompson@...ssion.com, bluesmoke-devel@...ts.sourceforge.net,
	axboe@...nel.dk, "Patrick McHardy" <kaber@...sh.net>,
	christine.caulfield@...glemail.com, Trond.Myklebust@...app.com,
	linux-wireless@...r.kernel.org, johannes@...solutions.net,
	yoshfuji@...ux-ipv6.org, shemminger@...ux-foundation.org,
	linux-nfs@...r.kernel.org, bfields@...ldses.org, neilb@...e.de,
	linux-ext4@...r.kernel.org, tytso@....edu, adilger@....com,
	netfilter-devel@...r.kernel.org
Subject: [PATCH 03/10] mac80211: Use rcu_barrier() on unload.

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

I'm having a hardtime verifying that no more call_rcu() callbacks can
be schedules in the module unload path.  Could a maintainer please
look into this?

Signed-off-by: Jesper Dangaard Brouer <hawk@...x.dk>
---

 net/mac80211/main.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 092a017..e9f70ce 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -1100,6 +1100,8 @@ static void __exit ieee80211_exit(void)
 		ieee80211s_stop();
 
 	ieee80211_debugfs_netdev_exit();
+
+	rcu_barrier(); /* Wait for completion of call_rcu()'s */
 }
 
 

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