netdev - bonding: 3ad: update slave arr after initialize

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Date:   Thu, 15 Apr 2021 14:59:49 +0800
From:   jin yiting <jinyiting@...wei.com>
To:     Jay Vosburgh <j.vosburgh@...il.com>,
        Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <security@...nel.org>, <linux-kernel@...r.kernel.org>
CC:     Xuhanbing <xuhanbing@...wei.com>,
        "wangxiaogang (F)" <wangxiaogang3@...wei.com>
Subject: bonding: 3ad: update slave arr after initialize

 From 71e63af579edd15ad7f7395760a19f67d9a1d7d3 Mon Sep 17 00:00:00 2001
From: jin yiting <jinyiting@...wei.com>
Date: Wed, 31 Mar 2021 20:38:40 +0800
Subject: [PATCH] bonding: 3ad: update slave arr after initialize
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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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