netdev - Re: bond link state mismatch, rtnl_trylock() vs rtnl

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Date:   Tue, 23 May 2017 14:35:41 -0700
From:   Nithin Sujir <nsujir@...tri.com>
To:     Mahesh Bandewar (महेश बंडेवार) <maheshb@...gle.com>
Cc:     linux-netdev <netdev@...r.kernel.org>
Subject: Re: bond link state mismatch, rtnl_trylock() vs rtnl_lock()



On 5/23/2017 2:30 PM, Mahesh Bandewar (महेश बंडेवार) wrote:
> On Tue, May 23, 2017 at 12:32 PM, Nithin Sujir <nsujir@...tri.com> wrote:
>> diff --git a/drivers/net/bonding/bond_main.c
>> b/drivers/net/bonding/bond_main.c
>> index 5dca77e..1f60503 100644
>> --- a/drivers/net/bonding/bond_main.c
>> +++ b/drivers/net/bonding/bond_main.c
>> @@ -2614,8 +2614,7 @@ static void bond_loadbalance_arp_mon(struct
>> work_struct *work)
>>          rcu_read_unlock();
>>
>>          if (do_failover || slave_state_changed) {
>> -               if (!rtnl_trylock())
>> -                       goto re_arm;
>> +               rtnl_lock();
> Nitin, you can't do this. The tryRTNL code is to prevent deadlock
> during work-cancellation during bond_close().
Thanks, Mahesh. Yes, Jay pointed me to your patch and I will take a look 
at how to use a similar approach.

Nithin.

>>                  if (slave_state_changed) {
>>                          bond_slave_state_change(bond);
>>
>>