netdev - bond: take rcu lock in bond_poll

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Message-ID: <20180928161631.3pab3m2k6zvoemnz@codemonkey.org.uk>
Date:   Fri, 28 Sep 2018 12:16:31 -0400
From:   Dave Jones <davej@...emonkey.org.uk>
To:     netdev@...r.kernel.org
Subject: bond: take rcu lock in bond_poll_controller

Callers of bond_for_each_slave_rcu are expected to hold the rcu lock,
otherwise a trace like below is shown

WARNING: CPU: 2 PID: 179 at net/core/dev.c:6567 netdev_lower_get_next_private_rcu+0x34/0x40
CPU: 2 PID: 179 Comm: kworker/u16:15 Not tainted 4.19.0-rc5-backup+ #1
Workqueue: bond0 bond_mii_monitor
RIP: 0010:netdev_lower_get_next_private_rcu+0x34/0x40
Code: 48 89 fb e8 fe 29 63 ff 85 c0 74 1e 48 8b 45 00 48 81 c3 c0 00 00 00 48 8b 00 48 39 d8 74 0f 48 89 45 00 48 8b 40 f8 5b 5d c3 <0f> 0b eb de 31 c0 eb f5 0f 1f 40 00 0f 1f 44 00 00 48 8>
RSP: 0018:ffffc9000087fa68 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff880429614560 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 00000000ffffffff RDI: ffffffffa184ada0
RBP: ffffc9000087fa80 R08: 0000000000000001 R09: 0000000000000000
R10: ffffc9000087f9f0 R11: ffff880429798040 R12: ffff8804289d5980
R13: ffffffffa1511f60 R14: 00000000000000c8 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff88042f880000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4b78fce180 CR3: 000000018180f006 CR4: 00000000001606e0
Call Trace:
 bond_poll_controller+0x52/0x170
 netpoll_poll_dev+0x79/0x290
 netpoll_send_skb_on_dev+0x158/0x2c0
 netpoll_send_udp+0x2d5/0x430
 write_ext_msg+0x1e0/0x210
 console_unlock+0x3c4/0x630
 vprintk_emit+0xfa/0x2f0
 printk+0x52/0x6e
 ? __netdev_printk+0x12b/0x220
 netdev_info+0x64/0x80
 ? bond_3ad_set_carrier+0xe9/0x180
 bond_select_active_slave+0x1fc/0x310
 bond_mii_monitor+0x709/0x9b0
 process_one_work+0x221/0x5e0
 worker_thread+0x4f/0x3b0
 kthread+0x100/0x140
 ? process_one_work+0x5e0/0x5e0
 ? kthread_delayed_work_timer_fn+0x90/0x90
 ret_from_fork+0x24/0x30

Signed-off-by: Dave Jones <davej@...emonkey.org.uk>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index c05c01a00755..77a3607a7099 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -977,6 +977,7 @@ static void bond_poll_controller(struct net_device *bond_dev)
 		if (bond_3ad_get_active_agg_info(bond, &ad_info))
 			return;
 
+	rcu_read_lock();
 	bond_for_each_slave_rcu(bond, slave, iter) {
 		if (!bond_slave_is_up(slave))
 			continue;
@@ -992,6 +993,7 @@ static void bond_poll_controller(struct net_device *bond_dev)
 
 		netpoll_poll_dev(slave->dev);
 	}
+	rcu_read_unlock();
 }
 
 static void bond_netpoll_cleanup(struct net_device *bond_dev)