netdev - Re: [PATCH] team: avoid race condition in scheduling delayed work

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Message-Id: <20141004.205128.1396970963248010476.davem@davemloft.net>
Date:	Sat, 04 Oct 2014 20:51:28 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	joe.lawrence@...atus.com
Cc:	netdev@...r.kernel.org, jiri@...nulli.us
Subject: Re: [PATCH] team: avoid race condition in scheduling delayed work

From: Joe Lawrence <joe.lawrence@...atus.com>
Date: Fri, 3 Oct 2014 09:58:34 -0400

> When team_notify_peers and team_mcast_rejoin are called, they both reset
> their respective .count_pending atomic variable. Then when the actual
> worker function is executed, the variable is atomically decremented.
> This pattern introduces a potential race condition where the
> .count_pending rolls over and the worker function keeps rescheduling
> until .count_pending decrements to zero again:
 ...
> Instead of assigning a new value to .count_pending, use atomic_add to
> tack-on the additional desired worker function invocations.
> 
> Signed-off-by: Joe Lawrence <joe.lawrence@...atus.com>
> Acked-by: Jiri Pirko <jiri@...nulli.us>
> Fixes: fc423ff00df3a19554414ee ("team: add peer notification")
> Fixes: 492b200efdd20b8fcfdac87 ("team: add support for sending multicast rejoins")

Applied and queued up for -stable, thanks.
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