diff options
| -rw-r--r-- | drivers/net/ifb.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c index 15949d3df17e..af233b591534 100644 --- a/drivers/net/ifb.c +++ b/drivers/net/ifb.c @@ -35,6 +35,7 @@ #include <linux/moduleparam.h> #include <net/pkt_sched.h> #include <net/net_namespace.h> +#include <linux/lockdep.h> #define TX_TIMEOUT (2*HZ) @@ -227,6 +228,16 @@ static struct rtnl_link_ops ifb_link_ops __read_mostly = { module_param(numifbs, int, 0); MODULE_PARM_DESC(numifbs, "Number of ifb devices"); +/* + * dev_ifb->queue_lock is usually taken after dev->ingress_lock, + * reversely to e.g. qdisc_lock_tree(). It should be safe until + * ifb doesn't take dev->queue_lock with dev_ifb->ingress_lock. + * But lockdep should know that ifb has different locks from dev. + */ +static struct lock_class_key ifb_queue_lock_key; +static struct lock_class_key ifb_ingress_lock_key; + + static int __init ifb_init_one(int index) { struct net_device *dev_ifb; @@ -246,6 +257,10 @@ static int __init ifb_init_one(int index) err = register_netdevice(dev_ifb); if (err < 0) goto err; + + lockdep_set_class(&dev_ifb->queue_lock, &ifb_queue_lock_key); + lockdep_set_class(&dev_ifb->ingress_lock, &ifb_ingress_lock_key); + return 0; err: |