From faff57a92ba1d7247c5e86ecea2886d2c9d54507 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <edumazet@google.com>
Date: Mon, 13 May 2013 02:24:11 +0000
Subject: net/802/mrp: fix lockdep splat
commit fb745e9a037895 ("net/802/mrp: fix possible race condition when
calling mrp_pdu_queue()") introduced a lockdep splat.
[ 19.735147] =================================
[ 19.735235] [ INFO: inconsistent lock state ]
[ 19.735324] 3.9.2-build-0063 #4 Not tainted
[ 19.735412] ---------------------------------
[ 19.735500] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
[ 19.735592] rmmod/1840 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 19.735682] (&(&app->lock)->rlock#2){+.?...}, at: [<f862bb5b>]
mrp_uninit_applicant+0x69/0xba [mrp]
app->lock is normally taken under softirq context, so disable BH to
avoid the splat.
Reported-by: Denys Fedoryshchenko <denys@visp.net.lb>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Ward <david.ward@ll.mit.edu>
Cc: Cong Wang <amwang@redhat.com>
Tested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/802/mrp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'net/802')
diff --git a/net/802/mrp.c b/net/802/mrp.c
index e085bcc754f6..1eb05d80b07b 100644
--- a/net/802/mrp.c
+++ b/net/802/mrp.c
@@ -871,10 +871,10 @@ void mrp_uninit_applicant(struct net_device *dev, struct mrp_application *appl)
*/
del_timer_sync(&app->join_timer);
- spin_lock(&app->lock);
+ spin_lock_bh(&app->lock);
mrp_mad_event(app, MRP_EVENT_TX);
mrp_pdu_queue(app);
- spin_unlock(&app->lock);
+ spin_unlock_bh(&app->lock);
mrp_queue_xmit(app);
--
cgit