linux-kernel - Re: [PATCHv2] bridge: disable snooping if there is no querier

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Message-Id: <20130730.161035.1646022729333223847.davem@davemloft.net>
Date:	Tue, 30 Jul 2013 16:10:35 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	linus.luessing@....de
Cc:	bridge@...ts.linux-foundation.org, stephen@...workplumber.org,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	herbert@...dor.apana.org.au, amwang@...hat.com,
	linux@...er-net.org.uk
Subject: Re: [PATCHv2] bridge: disable snooping if there is no querier

From: Linus Lüssing <linus.luessing@....de>
Date: Thu, 25 Jul 2013 15:56:20 +0200

> +	atomic64_t			multicast_querier_delay_time;

Please don't use an atomic64_t here, it's pointless.

You're only doing set and read operations on it, there's absolutely
nothing atomic about that.

You have to make sure that the top-level operations that use this
new value use an appropriate amount of locking on the higher level
objects.
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