netdev - Re: [PATCH net-next v2 2/10] bonding: rebuild the lock use for bond_mii

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Message-ID: <527E3DC7.3020908@gmail.com>
Date:	Sat, 09 Nov 2013 21:51:03 +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 2/10] bonding: rebuild the lock use for bond_mii_monitor()

于 2013/11/8 23:28, Nikolay Aleksandrov 写道:
> On 11/08/2013 03:07 AM, Ding Tianhong wrote:
> In fact the bond cannot disappear while this function is running, so this test
> should be able to run outside the RCU region if I'm not missing something :-)
> It'll be just as useful as running inside the region, at most a free run may
> happen if there's one slave and it disappears.
>
>
> This is unnecessary, bond_has_slaves() should be enough. See bond_start_xmit()
> and also the list_empty comment in include/linux/rculist.h for more information why.
> My bond_has_slaves() comments apply to all the patches that use it.
>
>

yes, you are right, I make a silly mistake, the bond list itself is no 
need to copy, it
dose not occur any problem if it be changed.

The curr_active_slave needs copy for peer, as it may be changed at 
monitor running.

Regards.
Ding

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