octeon, watchdog: 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 watchdog code in octeon by using this latter form of callback registration. Cc: Wim Van Sebroeck <wim@iguana.be> Cc: Ingo Molnar <mingo@kernel.org> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Родитель
180d864632
Коммит
99c3bf361a
|
@ -708,10 +708,13 @@ static int __init octeon_wdt_init(void)
|
|||
|
||||
cpumask_clear(&irq_enabled_cpus);
|
||||
|
||||
cpu_notifier_register_begin();
|
||||
for_each_online_cpu(cpu)
|
||||
octeon_wdt_setup_interrupt(cpu);
|
||||
|
||||
register_hotcpu_notifier(&octeon_wdt_cpu_notifier);
|
||||
__register_hotcpu_notifier(&octeon_wdt_cpu_notifier);
|
||||
cpu_notifier_register_done();
|
||||
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
@ -725,7 +728,8 @@ static void __exit octeon_wdt_cleanup(void)
|
|||
|
||||
misc_deregister(&octeon_wdt_miscdev);
|
||||
|
||||
unregister_hotcpu_notifier(&octeon_wdt_cpu_notifier);
|
||||
cpu_notifier_register_begin();
|
||||
__unregister_hotcpu_notifier(&octeon_wdt_cpu_notifier);
|
||||
|
||||
for_each_online_cpu(cpu) {
|
||||
int core = cpu2core(cpu);
|
||||
|
@ -734,6 +738,9 @@ static void __exit octeon_wdt_cleanup(void)
|
|||
/* Free the interrupt handler */
|
||||
free_irq(OCTEON_IRQ_WDOG0 + core, octeon_wdt_poke_irq);
|
||||
}
|
||||
|
||||
cpu_notifier_register_done();
|
||||
|
||||
/*
|
||||
* Disable the boot-bus memory, the code it points to is soon
|
||||
* to go missing.
|
||||
|
|
Загрузка…
Ссылка в новой задаче