netdev - Re: [PATCH net-next 2/9] bonding: remove __get_first

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Message-ID: <20130927145825.GA14139@redhat.com>
Date:	Fri, 27 Sep 2013 16:58:25 +0200
From:	Veaceslav Falico <vfalico@...hat.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	netdev@...r.kernel.org, nikolay@...hat.com,
	bhutchings@...arflare.com, Jay Vosburgh <fubar@...ibm.com>,
	Andy Gospodarek <andy@...yhouse.net>
Subject: Re: [PATCH net-next 2/9] bonding: remove __get_first_port()

On Fri, Sep 27, 2013 at 03:50:12PM +0100, David Laight wrote:
>> @@ -2104,8 +2091,11 @@ void bond_3ad_state_machine_handler(struct work_struct *work)
>>
>>  	// 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);
>> +		port = slave ? &(SLAVE_AD_INFO(slave).port) : NULL;
>> +
>>  		// select the active aggregator for the bond
>> -		if ((port = __get_first_port(bond))) {
>> +		if (port) {
>>  			if (!port->slave) {
>>  				pr_warning("%s: Warning: bond's first port is uninitialized\n",
>>  					   bond->dev->name);
>> --
>
>Looks like that could be:
>		slave = bond_first_slave(bond);
>		if (slave) {
>			port = SLAVE_AD_INFO(slave).port;
>and I assume 'slave == port->slave' so there is no need for the latter check?

I've also fallen to this trap at first - slave->port can (virtually) be
NULL, and this way we'll panic on "if (!port->slave)".

>
>	David
>
>
>
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