diff options
| author |   Jukka Rissanen <jukka.rissanen@linux.intel.com> | 2014-10-28 17:16:48 +0200 |
|---|---|---|
| committer |   Marcel Holtmann <marcel@holtmann.org> | 2014-10-28 17:04:39 +0100 |
| commit | df092306d688438b39f7d433f24e091fa387afaf (patch) | |
| tree | 06e34b0b35e6cd6111e3371e640338e1af84a0d9 /net/bluetooth/6lowpan.c | |
| parent | Bluetooth: 6lowpan: Converting rwlocks to use RCU (diff) | |
| download | linux-dev-df092306d688438b39f7d433f24e091fa387afaf.tar.xz linux-dev-df092306d688438b39f7d433f24e091fa387afaf.zip | |
Bluetooth: 6lowpan: Fix lockdep splats
When a device ndo_start_xmit() calls again dev_queue_xmit(),
lockdep can complain because dev_queue_xmit() is re-entered and the
spinlocks protecting tx queues share a common lockdep class.
Same issue was fixed for ieee802154 in commit "20e7c4e80dcd"
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth/6lowpan.c')
| -rw-r--r-- | net/bluetooth/6lowpan.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c index a681247b0aee..7254bddaca2f 100644 --- a/net/bluetooth/6lowpan.c +++ b/net/bluetooth/6lowpan.c @@ -662,7 +662,26 @@ static netdev_tx_t bt_xmit(struct sk_buff *skb, struct net_device *netdev) return err < 0 ? NET_XMIT_DROP : err; } +static struct lock_class_key bt_tx_busylock; +static struct lock_class_key bt_netdev_xmit_lock_key; + +static void bt_set_lockdep_class_one(struct net_device *dev, + struct netdev_queue *txq, + void *_unused) +{ + lockdep_set_class(&txq->_xmit_lock, &bt_netdev_xmit_lock_key); +} + +static int bt_dev_init(struct net_device *dev) +{ + netdev_for_each_tx_queue(dev, bt_set_lockdep_class_one, NULL); + dev->qdisc_tx_busylock = &bt_tx_busylock; + + return 0; +} + static const struct net_device_ops netdev_ops = { + .ndo_init = bt_dev_init, .ndo_start_xmit = bt_xmit, }; |