From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 12 Jul 2006 20:26:26 +0000 (-0700)
Subject: [NETROM] lockdep: fix false positive
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=4b260a98f1afc74cd6b73ce0616d76b441dbe8c5;p=deliverable%2Flinux.git

[NETROM] lockdep: fix false positive

NETROM network devices are virtual network devices encapsulating NETROM
frames into AX.25 which will be sent through an AX.25 device, so form a
special "super class" of normal net devices; split their locks off into a
separate class since they always nest.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/netrom/af_netrom.c b/net/netrom/af_netrom.c
index 672d5f803f8f..1d50f801f181 100644
--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -65,6 +65,14 @@ static DEFINE_SPINLOCK(nr_list_lock);
 
 static const struct proto_ops nr_proto_ops;
 
+/*
+ * NETROM network devices are virtual network devices encapsulating NETROM
+ * frames into AX.25 which will be sent through an AX.25 device, so form a
+ * special "super class" of normal net devices; split their locks off into a
+ * separate class since they always nest.
+ */
+static struct lock_class_key nr_netdev_xmit_lock_key;
+
 /*
  *	Socket removal during an interrupt is now safe.
  */
@@ -1405,6 +1413,7 @@ static int __init nr_proto_init(void)
 			free_netdev(dev);
 			goto fail;
 		}
+		lockdep_set_class(&dev->_xmit_lock, &nr_netdev_xmit_lock_key);
 		dev_nr[i] = dev;
 	}