Merge branch 'bonding'
Veaceslav Falico says:
====================
bonding: fix locking in bond_ab_arp_prob
After the latest patches, on every call of bond_ab_arp_probe() without an
active slave I see the following warning:
[ 7.912314] RTNL: assertion failed at net/core/dev.c (4494)
...
[ 7.922495] [<ffffffff817acc6f>] dump_stack+0x51/0x72
[ 7.923714] [<ffffffff8168795e>] netdev_master_upper_dev_get+0x6e/0x70
[ 7.924940] [<ffffffff816a2a66>] rtnl_link_fill+0x116/0x260
[ 7.926143] [<ffffffff817acc6f>] ? dump_stack+0x51/0x72
[ 7.927333] [<ffffffff816a350c>] rtnl_fill_ifinfo+0x95c/0xb90
[ 7.928529] [<ffffffff8167af2b>] ? __kmalloc_reserve+0x3b/0xa0
[ 7.929681] [<ffffffff8167bfcf>] ? __alloc_skb+0x9f/0x1e0
[ 7.930827] [<ffffffff816a3b64>] rtmsg_ifinfo+0x84/0x100
[ 7.931960] [<ffffffffa00bca07>] bond_ab_arp_probe+0x1a7/0x370 [bonding]
[ 7.933133] [<ffffffffa00bcd78>] bond_activebackup_arp_mon+0x1a8/0x2f0 [bonding]
...
It happens because in bond_ab_arp_probe() we change the flags of a slave
without holding the RTNL lock.
To fix this - remove the useless curr_active_lock, RCUify it and lock RTNL
while changing the slave's flags. Also, remove bond_ab_arp_probe() from
under any locks in bond_ab_arp_mon().
====================
Signed-off-by: Veaceslav Falico <vfalico@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
