This patchset is to fix lockdep false positive splat in multicast part of the bridge. When mdb or multicast config is changed, it acquires multicast_lock, which is a per-interface(bridge) lock. So, spin_lock_nested() should be used instead of spin_lock() because interfaces can be recursive. The spin_lock_nested() needs 'subclass' parameter. The first patch adds a new helper function, which returns the nest_level variable under RCU. The nest_level variable can be used as 'subclass' parameter of spin_lock_nested(). The second patch fix lockdep false positive splat in the bridge multicast part by using netdev_get_nest_level_rcu(). Taehee Yoo (2): net: core: make bond_get_lowest_level_rcu() generic net: bridge: fix lockdep multicast_lock false positive splat drivers/net/bonding/bond_main.c | 45 +--------- include/linux/netdevice.h | 1 + net/bridge/br_mdb.c | 12 +-- net/bridge/br_multicast.c | 146 ++++++++++++++++++++------------ net/bridge/br_multicast_eht.c | 18 ++-- net/bridge/br_private.h | 48 +++++++++++ net/core/dev.c | 44 ++++++++++ 7 files changed, 204 insertions(+), 110 deletions(-) -- 2.17.1
