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Date: Thu, 14 Jan 2016 01:51:53 +0800 From: Antonio Quartulli <a@...table.cc> To: davem@...emloft.net Cc: netdev@...r.kernel.org, b.a.t.m.a.n@...ts.open-mesh.org, Simon Wunderlich <simon@...n-mesh.com>, Marek Lindner <mareklindner@...mailbox.ch>, Antonio Quartulli <a@...table.cc> Subject: [PATCH 1/2] batman-adv: fix lockdep splat when doing mcast_free From: Simon Wunderlich <simon@...n-mesh.com> While testing, we got something like this: WARNING: CPU: 0 PID: 238 at net/batman-adv/multicast.c:142 batadv_mcast_mla_tt_retract+0x94/0x205 [batman_adv]() [...] Call Trace: [<ffffffff815fc597>] dump_stack+0x4b/0x64 [<ffffffff810b34dc>] warn_slowpath_common+0xbc/0x120 [<ffffffffa0024ec5>] ? batadv_mcast_mla_tt_retract+0x94/0x205 [batman_adv] [<ffffffff810b3705>] warn_slowpath_null+0x15/0x20 [<ffffffffa0024ec5>] batadv_mcast_mla_tt_retract+0x94/0x205 [batman_adv] [<ffffffffa00273fe>] batadv_mcast_free+0x36/0x39 [batman_adv] [<ffffffffa0020c77>] batadv_mesh_free+0x7d/0x13f [batman_adv] [<ffffffffa0036a6b>] batadv_softif_free+0x15/0x25 [batman_adv] [...] Signed-off-by: Simon Wunderlich <simon@...n-mesh.com> Signed-off-by: Marek Lindner <mareklindner@...mailbox.ch> Signed-off-by: Antonio Quartulli <a@...table.cc> --- net/batman-adv/multicast.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c index eb76386f8d4b..75fa5013af72 100644 --- a/net/batman-adv/multicast.c +++ b/net/batman-adv/multicast.c @@ -802,7 +802,9 @@ void batadv_mcast_free(struct batadv_priv *bat_priv) batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_MCAST, 1); batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_MCAST, 1); + spin_lock_bh(&bat_priv->tt.commit_lock); batadv_mcast_mla_tt_retract(bat_priv, NULL); + spin_unlock_bh(&bat_priv->tt.commit_lock); } /** -- 2.7.0
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