linux-kernel - Re: [PATCH v2 52/52] net/iucv/iucv.c: Fix CPU hotplug callback registration

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Message-Id: <20140214.133147.1908176449942033339.davem@davemloft.net>
Date:	Fri, 14 Feb 2014 13:31:47 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	srivatsa.bhat@...ux.vnet.ibm.com
Cc:	paulus@...ba.org, oleg@...hat.com, mingo@...nel.org,
	rusty@...tcorp.com.au, peterz@...radead.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, paulmck@...ux.vnet.ibm.com,
	tj@...nel.org, walken@...gle.com, ego@...ux.vnet.ibm.com,
	linux@....linux.org.uk, rjw@...ysocki.net,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	ursula.braun@...ibm.com, linux-s390@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2 52/52] net/iucv/iucv.c: Fix CPU hotplug callback
 registration

From: "Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Date: Fri, 14 Feb 2014 13:30:58 +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/iucv/iucv.c by using this latter form of callback
> registration. Also, provide helper functions to perform the common memory
> allocations and frees, to condense repetitive code.
> 
> Cc: Ursula Braun <ursula.braun@...ibm.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: linux-s390@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Acked-by: David S. Miller <davem@...emloft.net>
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