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Wang Chen 7dc00c82cb ipv4: Fix ipmr unregister device oops 
An oops happens during device unregister.

The following oops happened when I add two tunnels, which
use a same device, and then delete one tunnel.
Obviously deleting tunnel "A" causes device unregister, which
send a notification, and after receiving notification, ipmr do
unregister again for tunnel "B" which also use same device.
That is wrong.
After receiving notification, ipmr only needs to decrease reference
count and don't do duplicated unregister.
Fortunately, IPv6 side doesn't add tunnel in ip6mr, so it's clean.

This patch fixs:
- unregister device oops
- using after dev_put()

Here is the oops:
===
Jul 11 15:39:29 wangchen kernel: ------------[ cut here ]------------
Jul 11 15:39:29 wangchen kernel: kernel BUG at net/core/dev.c:3651!
Jul 11 15:39:29 wangchen kernel: invalid opcode: 0000 [#1] 
Jul 11 15:39:29 wangchen kernel: Modules linked in: ipip tunnel4 nfsd lockd nfs_acl auth_rpcgss sunrpc exportfs ipv6 snd_pcm_oss snd_mixer_oss snd_seq snd_seq_device af_packet binfmt_misc button battery ac loop dm_mod usbhid ff_memless pcmcia firmware_class ohci1394 8139too mii ieee1394 yenta_socket rsrc_nonstatic pcmcia_core ide_cd_mod cdrom snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm i2c_i801 snd_timer snd i2c_core soundcore snd_page_alloc rng_core shpchp ehci_hcd uhci_hcd pci_hotplug intel_agp agpgart usbcore ext3 jbd ata_piix ahci libata dock edd fan thermal processor thermal_sys piix sd_mod scsi_mod ide_disk ide_core [last unloaded: freq_table]
Jul 11 15:39:29 wangchen kernel: 
Jul 11 15:39:29 wangchen kernel: Pid: 4102, comm: mroute Not tainted (2.6.26-rc9-default #69)
Jul 11 15:39:29 wangchen kernel: EIP: 0060:[<c024636b>] EFLAGS: 00010202 CPU: 0
Jul 11 15:39:29 wangchen kernel: EIP is at rollback_registered+0x61/0xe3
Jul 11 15:39:29 wangchen kernel: EAX: 00000001 EBX: ecba6000 ECX: 00000000 EDX: ffffffff
Jul 11 15:39:29 wangchen kernel: ESI: 00000001 EDI: ecba6000 EBP: c03de2e8 ESP: ed8e7c3c
Jul 11 15:39:29 wangchen kernel:  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 0068
Jul 11 15:39:29 wangchen kernel: Process mroute (pid: 4102, ti=ed8e6000 task=ed41e830 task.ti=ed8e6000)
Jul 11 15:39:29 wangchen kernel: Stack: ecba6000 c024641c 00000028 c0284e1a 00000001 c03de2e8 ecba6000 eecff360 
Jul 11 15:39:29 wangchen kernel:        c0284e4c c03536f4 fffffff8 00000000 c029a819 ecba6000 00000006 ecba6000 
Jul 11 15:39:29 wangchen kernel:        00000000 ecba6000 c03de2c0 c012841b ffffffff 00000000 c024639f ecba6000 
Jul 11 15:39:29 wangchen kernel: Call Trace:
Jul 11 15:39:29 wangchen kernel:  [<c024641c>] unregister_netdevice+0x2f/0x51
Jul 11 15:39:29 wangchen kernel:  [<c0284e1a>] vif_delete+0xaf/0xc3
Jul 11 15:39:29 wangchen kernel:  [<c0284e4c>] ipmr_device_event+0x1e/0x30
Jul 11 15:39:29 wangchen kernel:  [<c029a819>] notifier_call_chain+0x2a/0x47
Jul 11 15:39:29 wangchen kernel:  [<c012841b>] raw_notifier_call_chain+0x9/0xc
Jul 11 15:39:29 wangchen kernel:  [<c024639f>] rollback_registered+0x95/0xe3
Jul 11 15:39:29 wangchen kernel:  [<c024641c>] unregister_netdevice+0x2f/0x51
Jul 11 15:39:29 wangchen kernel:  [<c0284e1a>] vif_delete+0xaf/0xc3
Jul 11 15:39:29 wangchen kernel:  [<c0285eee>] ip_mroute_setsockopt+0x47a/0x801
Jul 11 15:39:29 wangchen kernel:  [<eea5a70c>] do_get_write_access+0x2df/0x313 [jbd]
Jul 11 15:39:29 wangchen kernel:  [<c01727c4>] __find_get_block_slow+0xda/0xe4
Jul 11 15:39:29 wangchen kernel:  [<c0172a7f>] __find_get_block+0xf8/0x122
Jul 11 15:39:29 wangchen kernel:  [<c0172a7f>] __find_get_block+0xf8/0x122
Jul 11 15:39:29 wangchen kernel:  [<eea5d563>] journal_cancel_revoke+0xda/0x110 [jbd]
Jul 11 15:39:29 wangchen kernel:  [<c0263501>] ip_setsockopt+0xa9/0x9ee
Jul 11 15:39:29 wangchen kernel:  [<eea5d563>] journal_cancel_revoke+0xda/0x110 [jbd]
Jul 11 15:39:29 wangchen kernel:  [<eea5a70c>] do_get_write_access+0x2df/0x313 [jbd]
Jul 11 15:39:29 wangchen kernel:  [<eea69287>] __ext3_get_inode_loc+0xcf/0x271 [ext3]
Jul 11 15:39:29 wangchen kernel:  [<eea743c7>] __ext3_journal_dirty_metadata+0x13/0x32 [ext3]
Jul 11 15:39:29 wangchen kernel:  [<c0116434>] __wake_up+0xf/0x15
Jul 11 15:39:29 wangchen kernel:  [<eea5a424>] journal_stop+0x1bd/0x1c6 [jbd]
Jul 11 15:39:29 wangchen kernel:  [<eea703a7>] __ext3_journal_stop+0x19/0x34 [ext3]
Jul 11 15:39:29 wangchen kernel:  [<c014291e>] get_page_from_freelist+0x94/0x369
Jul 11 15:39:29 wangchen kernel:  [<c01408f2>] filemap_fault+0x1ac/0x2fe
Jul 11 15:39:29 wangchen kernel:  [<c01a605e>] security_sk_alloc+0xd/0xf
Jul 11 15:39:29 wangchen kernel:  [<c023edea>] sk_prot_alloc+0x36/0x78
Jul 11 15:39:29 wangchen kernel:  [<c0240037>] sk_alloc+0x3a/0x40
Jul 11 15:39:29 wangchen kernel:  [<c0276062>] raw_hash_sk+0x46/0x4e
Jul 11 15:39:29 wangchen kernel:  [<c0166aff>] d_alloc+0x1b/0x157
Jul 11 15:39:29 wangchen kernel:  [<c023e4d1>] sock_common_setsockopt+0x12/0x16
Jul 11 15:39:29 wangchen kernel:  [<c023cb1e>] sys_setsockopt+0x6f/0x8e
Jul 11 15:39:29 wangchen kernel:  [<c023e105>] sys_socketcall+0x15c/0x19e
Jul 11 15:39:29 wangchen kernel:  [<c0103611>] sysenter_past_esp+0x6a/0x99
Jul 11 15:39:29 wangchen kernel:  [<c0290000>] unix_poll+0x69/0x78
Jul 11 15:39:29 wangchen kernel:  =======================
Jul 11 15:39:29 wangchen kernel: Code: 83 e0 01 00 00 85 c0 75 1f 53 53 68 12 81 31 c0 e8 3c 30 ed ff ba 3f 0e 00 00 b8 b9 7f 31 c0 83 c4 0c 5b e9 f5 26 ed ff 48 74 04 <0f> 0b eb fe 89 d8 e8 21 ff ff ff 89 d8 e8 62 ea ff ff c7 83 e0 
Jul 11 15:39:29 wangchen kernel: EIP: [<c024636b>] rollback_registered+0x61/0xe3 SS:ESP 0068:ed8e7c3c
Jul 11 15:39:29 wangchen kernel: ---[ end trace c311acf85d169786 ]---
===

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-07-14 20:56:34 -07:00
..
ipvs net: remove CVS keywords 2008-06-11 21:00:38 -07:00
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-14 20:23:54 -07:00
af_inet.c ipv4: Do cleanup for ip_mr_init 2008-07-03 17:51:57 +09:00
ah4.c
arp.c netns: add namespace parameter to rt_cache_flush 2008-07-05 19:00:44 -07:00
cipso_ipv4.c cipso: Relax too much careful cipso hash function. 2008-05-13 23:23:55 -07:00
datagram.c
devinet.c netns: add namespace parameter to rt_cache_flush 2008-07-05 19:00:44 -07:00
esp4.c
fib_frontend.c netns: add namespace parameter to rt_cache_flush 2008-07-05 19:00:44 -07:00
fib_hash.c netns: add namespace parameter to rt_cache_flush 2008-07-05 19:00:44 -07:00
fib_lookup.h
fib_rules.c net: add fib_rules_ops to flush_cache method 2008-07-05 19:01:28 -07:00
fib_semantics.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-13 20:52:39 -07:00
fib_trie.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-14 20:23:54 -07:00
icmp.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
igmp.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
inet_connection_sock.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-16 18:25:48 -07:00
inet_diag.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
inet_fragment.c inet fragments: fix race between inet_frag_find and inet_frag_secret_rebuild 2008-06-27 20:06:08 -07:00
inet_hashtables.c inet: add struct net argument to inet_ehashfn 2008-06-16 17:13:27 -07:00
inet_lro.c net/inet_lro: remove setting skb->ip_summed when not LRO-able 2008-06-27 20:09:00 -07:00
inet_timewait_sock.c inet: add struct net argument to inet_bhashfn 2008-06-16 17:12:49 -07:00
inetpeer.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_forward.c net: Discard and warn about LRO'd skbs received for forwarding 2008-06-19 16:22:28 -07:00
ip_fragment.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-28 01:19:40 -07:00
ip_gre.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-05-25 23:26:10 -07:00
ip_input.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_options.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_output.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_sockglue.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipcomp.c net: Remove unnecessary inclusions of asm/semaphore.h 2008-04-18 22:15:50 -04:00
ipconfig.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipip.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipmr.c ipv4: Fix ipmr unregister device oops 2008-07-14 20:56:34 -07:00
Kconfig
Makefile
netfilter.c
proc.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
protocol.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
raw.c udp: sk_drops handling 2008-06-17 21:04:56 -07:00
route.c ipv4: remove flush_mutex from ipv4_sysctl_rtcache_flush 2008-07-08 03:05:28 -07:00
syncookies.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-13 20:52:39 -07:00
sysctl_net_ipv4.c icmp: fix units for ratelimit 2008-07-01 19:29:07 -07:00
tcp_bic.c
tcp_cong.c tcp: Limit cwnd growth when deferring for GSO 2008-04-29 03:13:52 -07:00
tcp_cubic.c rename div64_64 to div64_u64 2008-05-01 08:03:58 -07:00
tcp_diag.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c net: fix returning void-valued expression warnings 2008-05-01 02:47:38 -07:00
tcp_illinois.c
tcp_input.c tcp: de-bloat a bit with factoring NET_INC_STATS_BH out 2008-07-03 01:05:41 -07:00
tcp_ipv4.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-28 01:19:40 -07:00
tcp_lp.c
tcp_minisocks.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-06-13 20:52:39 -07:00
tcp_output.c tcp: de-bloat a bit with factoring NET_INC_STATS_BH out 2008-07-03 01:05:41 -07:00
tcp_probe.c tcp: correct kcalloc usage 2008-07-10 16:51:32 -07:00
tcp_scalable.c
tcp_timer.c tcp: de-bloat a bit with factoring NET_INC_STATS_BH out 2008-07-03 01:05:41 -07:00
tcp_vegas.c net: fix returning void-valued expression warnings 2008-05-01 02:47:38 -07:00
tcp_vegas.h
tcp_veno.c net: fix returning void-valued expression warnings 2008-05-01 02:47:38 -07:00
tcp_westwood.c
tcp_yeah.c
tcp.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-07-05 23:08:07 -07:00
tunnel4.c [IPV4] TUNNEL4: Fix incoming packet length check for inter-protocol tunnel. 2008-06-05 04:02:33 +09:00
udp_impl.h net: change proto destroy method to return void 2008-06-14 17:04:49 -07:00
udp.c MIB: add struct net to UDP_INC_STATS_BH 2008-07-05 21:18:48 -07:00
udplite.c net: remove CVS keywords 2008-06-11 21:00:38 -07:00
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c xfrm: fix fragmentation for ipv4 xfrm tunnel 2008-06-17 16:38:23 -07:00
xfrm4_output.c
xfrm4_policy.c
xfrm4_state.c
xfrm4_tunnel.c