netdev - [PATCH] bonding: 3ad: update slave arr after initialize

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Date:   Fri, 16 Apr 2021 09:53:02 +0800
From:   jinyiting <jinyiting@...wei.com>
To:     <j.vosburgh@...il.com>, <vfalico@...il.com>, <andy@...yhouse.net>,
        <davem@...emloft.net>, <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <security@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     <xuhanbing@...wei.com>, <wangxiaogang3@...wei.com>
Subject: [PATCH] bonding: 3ad: update slave arr after initialize

From: jin yiting <jinyiting@...wei.com>

The bond works in mode 4, and performs down/up operations on the bond
that is normally negotiated. The probability of bond-> slave_arr is NULL

Test commands:
    ifconfig bond1 down
    ifconfig bond1 up

The conflict occurs in the following process：

__dev_open (CPU A)
 --bond_open
   --queue_delayed_work(bond->wq,&bond->ad_work,0);
   --bond_update_slave_arr
     --bond_3ad_get_active_agg_info

ad_work(CPU B)
 --bond_3ad_state_machine_handler
   --ad_agg_selection_logic

ad_work runs on cpu B. In the function ad_agg_selection_logic, all
agg->is_active will be cleared. Before the new active aggregator is
selected on CPU B, bond_3ad_get_active_agg_info failed on CPU A,
bond->slave_arr will be set to NULL. The best aggregator in
ad_agg_selection_logic has not changed, no need to update slave arr.

Signed-off-by: jin yiting <jinyiting@...wei.com>
---
 drivers/net/bonding/bond_3ad.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 6908822..d100079 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -2327,6 +2327,12 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
 
 			aggregator = __get_first_agg(port);
 			ad_agg_selection_logic(aggregator, &update_slave_arr);
+			if (!update_slave_arr) {
+				struct aggregator *active = __get_active_agg(aggregator);
+
+				if (active && active->is_active)
+					update_slave_arr = true;
+			}
 		}
 		bond_3ad_set_carrier(bond);
 	}
-- 
1.7.12.4