arm, kvm: fix double lock on cpu_add_remove_lock

Commit 8146875de7d4 (arm, kvm: Fix CPU hotplug callback registration)
holds the lock before calling the two functions:

	kvm_vgic_hyp_init()
	kvm_timer_hyp_init()

and both the two functions are calling register_cpu_notifier()
to register cpu notifier, so cause double lock on cpu_add_remove_lock.

Considered that both two functions are only called inside
kvm_arch_init() with holding cpu_add_remove_lock, so simply use
__register_cpu_notifier() to fix the problem.

Fixes: 8146875de7d4 (arm, kvm: Fix CPU hotplug callback registration)
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/virt/kvm/arm/arch_timer.c b/virt/kvm/arm/arch_timer.c
index 5081e80..22fa819 100644 (file)
--- a/virt/kvm/arm/arch_timer.c
+++ b/virt/kvm/arm/arch_timer.c
@@ -277,7 +277,7 @@ int kvm_timer_hyp_init(void)
 
        host_vtimer_irq = ppi;
 
-       err = register_cpu_notifier(&kvm_timer_cpu_nb);
+       err = __register_cpu_notifier(&kvm_timer_cpu_nb);
        if (err) {
                kvm_err("Cannot register timer CPU notifier\n");
                goto out_free;

diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 8ca405c..47b2983 100644 (file)
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1496,7 +1496,7 @@ int kvm_vgic_hyp_init(void)
                goto out;
        }
 
-       ret = register_cpu_notifier(&vgic_cpu_nb);
+       ret = __register_cpu_notifier(&vgic_cpu_nb);
        if (ret) {
                kvm_err("Cannot register vgic CPU notifier\n");
                goto out_free_irq;