| Date | Thu, 06 Feb 2014 20:39:35 -0800 (PST) | Subject | Re: [PATCH 51/51] net/iucv/iucv.c: Fix CPU hotplug callback registration | From | David Miller <> |
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From: "Srivatsa S. Bhat" <srivatsa.bhat@linux.vnet.ibm.com> Date: Thu, 06 Feb 2014 03:43:55 +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@de.ibm.com> > Cc: "David S. Miller" <davem@davemloft.net> > Cc: linux-s390@vger.kernel.org > Cc: netdev@vger.kernel.org > Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Applied.
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