netdev - Re: [PATCH net-next] bridge: remove a redundant synchronize

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Date:	Tue, 02 Apr 2013 14:19:11 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	vfalico@...hat.com, netdev@...r.kernel.org,
	stephen@...workplumber.org, jiri@...nulli.us
Subject: Re: [PATCH net-next] bridge: remove a redundant synchronize_net()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 02 Apr 2013 09:27:57 -0700

> On Tue, 2013-04-02 at 12:12 -0400, David Miller wrote:
> 
>> Note that we have a few spots now that do two synchronize_net()'s per
>> opertaion, such as team port removal, and openvswitch has such a path
>> as well.  They all are of the form:
>> 
>> 	netdev_rx_handler_unregister()
>> 	...
>> 	lots of other stuff
>> 	...
>> 	synchronize_net();
>> 
>> So might be harder to factor back out than this br_if.c case.
>> 
> 
> Strange, I do see call_rcu() in openvswitch, not a synchronize_{net|
> rcu}(). Probably OK to leave as is, as it's not a big deal.

My bad, I misread the code.

> I'll let Jiri handle the team driver change, as its not clear what
> synchronize_rcu() call in team_port_del() is protecting

Ok.
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