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Andy Gospodarek 96ac5cc963 ipv4: fix RCU lockdep warning from linkdown changes 
The following lockdep splat was seen due to the wrong context for
grabbing in_dev.

===============================
[ INFO: suspicious RCU usage. ]
4.1.0-next-20150626-dbg-00020-g54a6d91-dirty #244 Not tainted
-------------------------------
include/linux/inetdevice.h:205 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 1, debug_locks = 0
2 locks held by ip/403:
 #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff81453305>] rtnl_lock+0x17/0x19
 #1:  ((inetaddr_chain).rwsem){.+.+.+}, at: [<ffffffff8105c327>] __blocking_notifier_call_chain+0x35/0x6a

stack backtrace:
CPU: 2 PID: 403 Comm: ip Not tainted 4.1.0-next-20150626-dbg-00020-g54a6d91-dirty #244
 0000000000000001 ffff8800b189b728 ffffffff8150a542 ffffffff8107a8b3
 ffff880037bbea40 ffff8800b189b758 ffffffff8107cb74 ffff8800379dbd00
 ffff8800bec85800 ffff8800bf9e13c0 00000000000000ff ffff8800b189b7d8
Call Trace:
 [<ffffffff8150a542>] dump_stack+0x4c/0x6e
 [<ffffffff8107a8b3>] ? up+0x39/0x3e
 [<ffffffff8107cb74>] lockdep_rcu_suspicious+0xf7/0x100
 [<ffffffff814b63c3>] fib_dump_info+0x227/0x3e2
 [<ffffffff814b6624>] rtmsg_fib+0xa6/0x116
 [<ffffffff814b978f>] fib_table_insert+0x316/0x355
 [<ffffffff814b362e>] fib_magic+0xb7/0xc7
 [<ffffffff814b4803>] fib_add_ifaddr+0xb1/0x13b
 [<ffffffff814b4d09>] fib_inetaddr_event+0x36/0x90
 [<ffffffff8105c086>] notifier_call_chain+0x4c/0x71
 [<ffffffff8105c340>] __blocking_notifier_call_chain+0x4e/0x6a
 [<ffffffff8105c370>] blocking_notifier_call_chain+0x14/0x16
 [<ffffffff814a7f50>] __inet_insert_ifa+0x1a5/0x1b3
 [<ffffffff814a894d>] inet_rtm_newaddr+0x350/0x35f
 [<ffffffff81457866>] rtnetlink_rcv_msg+0x17b/0x18a
 [<ffffffff8107e7c3>] ? trace_hardirqs_on+0xd/0xf
 [<ffffffff8146965f>] ? netlink_deliver_tap+0x1cb/0x1f7
 [<ffffffff814576eb>] ? rtnl_newlink+0x72a/0x72a
...

This patch resolves that splat.

Signed-off-by: Andy Gospodarek <gospo@cumulusnetworks.com>
Reported-by: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2015-06-28 16:47:12 -07:00
..
netfilter net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
Kconfig tcp: add CDG congestion control 2015-06-11 00:09:12 -07:00
Makefile tcp: add CDG congestion control 2015-06-11 00:09:12 -07:00
af_inet.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
ah4.c ipsec: Remove obsolete MAX_AH_AUTH_LEN 2014-09-18 10:54:36 +02:00
arp.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
cipso_ipv4.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
datagram.c net: Save TX flow hash in sock and set in skbuf on xmit 2014-07-07 21:14:21 -07:00
devinet.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
esp4.c esp4: Switch to new AEAD interface 2015-05-28 11:23:20 +08:00
fib_frontend.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
fib_lookup.h ipv4: FIB Local/MAIN table collapse 2015-03-11 16:22:14 -04:00
fib_rules.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
fib_semantics.c ipv4: fix RCU lockdep warning from linkdown changes 2015-06-28 16:47:12 -07:00
fib_trie.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
fou.c fou: avoid missing unlock in failure path 2015-04-16 12:11:19 -04:00
geneve_core.c geneve_core: identify as driver library in modules description 2015-05-13 15:59:13 -04:00
gre_demux.c net: Fix GRE RX to use skb_transport_header for GRE header offset 2014-09-08 15:23:05 -07:00
gre_offload.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
icmp.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
igmp.c net: Export IGMP/MLD message validation code 2015-05-04 14:49:23 -04:00
inet_connection_sock.c tcp: improve REUSEADDR/NOREUSEADDR cohabitation 2015-05-21 18:55:32 -04:00
inet_diag.c net: inet_diag: export IPV6_V6ONLY sockopt 2015-06-24 02:51:39 -07:00
inet_fragment.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
inet_hashtables.c tcp: connect() from bound sockets can be faster 2015-05-27 14:30:10 -04:00
inet_lro.c lro: remove dead code 2013-12-29 16:34:25 -05:00
inet_timewait_sock.c tcp/dccp: tw_timer_handler() is static 2015-05-13 15:21:33 -04:00
inetpeer.c inet: remove dead inetpeer sequence code 2014-09-08 16:42:42 -07:00
ip_forward.c ip: reject too-big defragmented DF-skb when forwarding 2015-05-25 00:08:48 -04:00
ip_fragment.c ip_fragment: don't forward defragmented DF packet 2015-05-27 13:03:31 -04:00
ip_gre.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ip_input.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
ip_options.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
ip_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2015-06-15 14:30:32 -07:00
ip_sockglue.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
ip_tunnel.c udp_tunnel: Pass UDP socket down through udp_tunnel{, 6}_xmit_skb(). 2015-04-07 15:29:08 -04:00
ip_tunnel_core.c ip_tunnel: Report Rx dropped in ip_tunnel_get_stats64 2015-05-14 22:30:54 -04:00
ip_vti.c ip_vti/ip6_vti: Preserve skb->mark after rcv_cb call 2015-05-28 06:23:32 +02:00
ipcomp.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ipconfig.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ipip.c ipip: fix one sparse error 2015-05-17 13:08:29 -04:00
ipmr.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
netfilter.c netfilter: Use nf_hook_state in nf_queue_entry. 2015-04-04 12:25:22 -04:00
ping.c ipv4: Missing sk_nulls_node_init() in ping_unhash(). 2015-05-01 22:02:47 -04:00
proc.c tcp: add TCPWinProbe and TCPKeepAlive SNMP counters 2015-05-09 16:42:32 -04:00
protocol.c net: Export inet_offloads and inet6_offloads 2014-09-19 17:15:31 -04:00
raw.c Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-13 18:18:05 -04:00
route.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
syncookies.c tcp: get_cookie_sock() consolidation 2015-06-07 15:19:52 -07:00
sysctl_net_ipv4.c net: limit tcp/udp rmem/wmem to SOCK_{RCV,SND}BUF_MIN 2015-05-30 17:37:44 -07:00
tcp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
tcp_bic.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_cdg.c tcp: cdg: use div_u64() 2015-06-14 12:57:45 -07:00
tcp_cong.c tcp: fix child sockets to use system default congestion control if not set 2015-05-31 21:49:14 -07:00
tcp_cubic.c tcp: restore 1.5x per RTT limit to CUBIC cwnd growth in congestion avoidance 2015-03-11 16:51:51 -04:00
tcp_dctcp.c net: tcp: dctcp_update_alpha() fixes. 2015-06-10 23:28:33 -07:00
tcp_diag.c sock_diag: implement a get_info handler for inet 2015-06-15 19:49:22 -07:00
tcp_fastopen.c tcp: Do not call tcp_fastopen_reset_cipher from interrupt context 2015-06-23 02:38:10 -07:00
tcp_highspeed.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_htcp.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_hybla.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_illinois.c tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_input.c tcp: fill shinfo->gso_size at last moment 2015-06-11 16:33:11 -07:00
tcp_ipv4.c tcp: remove redundant checks II 2015-06-07 01:55:01 -07:00
tcp_lp.c tcp: remove in_flight parameter from cong_avoid() methods 2014-05-03 19:23:07 -04:00
tcp_memcontrol.c memcg: cleanup static keys decrement 2015-02-12 18:54:10 -08:00
tcp_metrics.c tcp: RFC7413 option support for Fast Open client 2015-04-07 18:36:39 -04:00
tcp_minisocks.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-01 22:51:30 -07:00
tcp_offload.c tcp: reserve tcp_skb_mss() to tcp stack 2015-06-11 16:33:10 -07:00
tcp_output.c tcp: remove obsolete check in tcp_set_skb_tso_segs() 2015-06-11 16:33:11 -07:00
tcp_probe.c tcp: whitespace fixes 2014-09-01 18:12:45 -07:00
tcp_scalable.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_timer.c tcp: introduce tcp_under_memory_pressure() 2015-05-17 22:45:48 -04:00
tcp_vegas.c tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_vegas.h tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_veno.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tcp_westwood.c tcp_westwood: fix tcp_westwood_info() 2015-05-05 19:50:09 -04:00
tcp_yeah.c tcp: stretch ACK fixes prep 2015-01-28 22:18:37 -08:00
tunnel4.c
…
udp.c ipv4/udp: Verify multicast group is ours in upd_v4_early_demux() 2015-06-04 00:46:26 -07:00
udp_diag.c sock_diag: specify info_size per inet protocol 2015-06-15 19:49:22 -07:00
udp_impl.h net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
udp_offload.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
udp_tunnel.c net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
udplite.c net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
xfrm4_input.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
xfrm4_mode_beet.c ipv4: ERROR: code indent should use tabs where possible 2013-12-26 13:43:21 -05:00
xfrm4_mode_transport.c
…
xfrm4_mode_tunnel.c ipv4: hash net ptr into fragmentation bucket selection 2015-03-25 14:07:04 -04:00
xfrm4_output.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
xfrm4_policy.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
xfrm4_protocol.c xfrm4: Remove duplicate semicolon 2014-06-30 07:49:47 +02:00
xfrm4_state.c inet: make no_pmtu_disc per namespace and kill ipv4_config 2013-12-18 16:58:20 -05:00
xfrm4_tunnel.c
…