Srivatsa S. Bhat a0e247a805 net/iucv/iucv.c: Fix CPU hotplug callback registration ... 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: get_online_cpus(); for_each_online_cpu(cpu) init_cpu(cpu); register_cpu_notifier(&foobar_cpu_notifier); put_online_cpus(); 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: cpu_notifier_register_begin(); for_each_online_cpu(cpu) init_cpu(cpu); /* Note the use of the double underscored version of the API */ __register_cpu_notifier(&foobar_cpu_notifier); cpu_notifier_register_done(); 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: Ingo Molnar <mingo@kernel.org> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>		2014-03-20 13:43:48 +01:00
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af_iucv.c	net: rework recvmsg handler msg_name and msg_namelen logic	2013-11-20 21:52:30 -05:00
iucv.c	net/iucv/iucv.c: Fix CPU hotplug callback registration	2014-03-20 13:43:48 +01:00
Kconfig	iucv: kernel option for z/VM IUCV and HiperSockets	2011-08-13 01:10:16 -07:00
Makefile	[S390]: Add AF_IUCV socket support	2007-02-08 13:51:54 -08:00