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authorRalf Baechle <ralf@linux-mips.org>2006-07-10 11:24:46 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2006-07-10 14:50:33 -0700
commit1eeb7e42888b3bde403596eebdbd64452a53f4d5 (patch)
tree3d7c7fc76b61a4ecceaf03c206336bce96ddeb28 /drivers/net
parent7466d90f858ad89dda6f47b744e0a839937907a3 (diff)
[BPQ] lockdep: fix false positive
Bpqether is encapsulating AX.25 frames into ethernet frames. There is a virtual bpqether device paired with each ethernet devices, so it's normal to pass through dev_queue_xmit twice for each frame which triggers the locking detector. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/hamradio/bpqether.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/net/hamradio/bpqether.c b/drivers/net/hamradio/bpqether.c
index 0641f54fc63..889f338132f 100644
--- a/drivers/net/hamradio/bpqether.c
+++ b/drivers/net/hamradio/bpqether.c
@@ -122,6 +122,12 @@ struct bpqdev {
static LIST_HEAD(bpq_devices);
+/*
+ * bpqether network devices are paired with ethernet devices below them, so
+ * form a special "super class" of normal ethernet devices; split their locks
+ * off into a separate class since they always nest.
+ */
+static struct lock_class_key bpq_netdev_xmit_lock_key;
/* ------------------------------------------------------------------------ */
@@ -528,6 +534,7 @@ static int bpq_new_device(struct net_device *edev)
err = register_netdevice(ndev);
if (err)
goto error;
+ lockdep_set_class(&ndev->_xmit_lock, &bpq_netdev_xmit_lock_key);
/* List protected by RTNL */
list_add_rcu(&bpq->bpq_list, &bpq_devices);