netdev - Re: [PATCH net-next v2 7/10] bonding: rebuild the lock use for bond_3ad_state_machine

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Date:	Sat, 09 Nov 2013 21:54:17 +0800
From:	Ding Tianhong <dthxman@...il.com>
To:	Nikolay Aleksandrov <nikolay@...hat.com>
CC:	Ding Tianhong <dingtianhong@...wei.com>,
	Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>,
	"David S. Miller" <davem@...emloft.net>,
	Veaceslav Falico <vfalico@...hat.com>,
	Netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 7/10] bonding: rebuild the lock use for bond_3ad_state_machine_handler()

于 2013/11/8 23:43, Nikolay Aleksandrov 写道:
> On 11/08/2013 03:08 AM, Ding Tianhong wrote:
>> The bond_3ad_state_machine_handler() use the bond lock to protect
>> the bond slave list and slave port, so as the before patch said,
>> I remove bond lock and replace with RCU.
>>
>> The nots in the function is still too old, clean up the nots.
>>
>> Suggested-by: Jay Vosburgh <fubar@...ibm.com>
>> Suggested-by: Veaceslav Falico <vfalico@...hat.com>
>> Signed-off-by: Ding Tianhong <dingtianhong@...wei.com>
>> ---
>>   drivers/net/bonding/bond_3ad.c | 21 ++++++++++-----------
>>   1 file changed, 10 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
>> index 187b1b7..09edccf61 100644
>> --- a/drivers/net/bonding/bond_3ad.c
>> +++ b/drivers/net/bonding/bond_3ad.c
>> @@ -2068,18 +2068,18 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
>>   	struct slave *slave;
>>   	struct port *port;
>>   
>> -	read_lock(&bond->lock);
>> +	rcu_read_lock();
>>   
>> -	//check if there are any slaves
>> -	if (!bond_has_slaves(bond))
>> +	/* check if there are any slaves */
>> +	if (!bond_has_slaves_rcu(bond))
>>   		goto re_arm;
>>   
>> -	// check if agg_select_timer timer after initialize is timed out
>> +	/* check if agg_select_timer timer after initialize is timed out */
>>   	if (BOND_AD_INFO(bond).agg_select_timer && !(--BOND_AD_INFO(bond).agg_select_timer)) {
>> -		slave = bond_first_slave(bond);
>> +		slave = bond_first_slave_rcu(bond);
>>   		port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
>>   
>> -		// select the active aggregator for the bond
>> +		/* select the active aggregator for the bond */
>>   		if (port) {
>>   			if (!port->slave) {
>>   				pr_warning("%s: Warning: bond's first port is uninitialized\n",
> This continues to execute:
> aggregator = __get_first_agg(port);
> ad_agg_selection_logic(aggregator)
> And neither ad_agg_selection_logic nor __get_first_agg are RCU-safe.
>
yes, I miss it, thanks a lot.

Regards.
Ding


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