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Date:	Thu, 06 Feb 2014 20:39:21 -0800 (PST)
From:	David Miller <>
Subject: Re: [PATCH 50/51] net/core/flow.c: Fix CPU hotplug callback

From: "Srivatsa S. Bhat" <>
Date: Thu, 06 Feb 2014 03:43:46 +0530

> Subsystems that want to register CPU hotplug callbacks, as well as perform
> initialization for the CPUs that are already online, often do it as shown
> below:
> This is wrong, since it is prone to ABBA deadlocks involving the
> cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
> with CPU hotplug operations).
> Instead, the correct and race-free way of performing the callback
> registration is:
> Fix the code in net/core/flow.c by using this latter form of callback
> registration.
> Cc: "David S. Miller" <>
> Cc: Li RongQing <>
> Cc: Sasha Levin <>
> Cc: Andrew Morton <>
> Cc: Chris Metcalf <>
> Cc:
> Signed-off-by: Srivatsa S. Bhat <>

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