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>
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@ -1045,7 +1045,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
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nla_put_u32(skb, RTA_OIF, fi->fib_nh->nh_oif))
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goto nla_put_failure;
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if (fi->fib_nh->nh_flags & RTNH_F_LINKDOWN) {
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in_dev = __in_dev_get_rcu(fi->fib_nh->nh_dev);
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in_dev = __in_dev_get_rtnl(fi->fib_nh->nh_dev);
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if (in_dev &&
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IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
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rtm->rtm_flags |= RTNH_F_DEAD;
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@ -1074,7 +1074,7 @@ int fib_dump_info(struct sk_buff *skb, u32 portid, u32 seq, int event,
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rtnh->rtnh_flags = nh->nh_flags & 0xFF;
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if (nh->nh_flags & RTNH_F_LINKDOWN) {
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in_dev = __in_dev_get_rcu(nh->nh_dev);
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in_dev = __in_dev_get_rtnl(nh->nh_dev);
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if (in_dev &&
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IN_DEV_IGNORE_ROUTES_WITH_LINKDOWN(in_dev))
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rtnh->rtnh_flags |= RTNH_F_DEAD;
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