xen/time: Check that the per_cpu data structure has data before freeing.

We don't check whether the per_cpu data structure has actually
been freed in the past. This checks it and if it has been freed
in the past then just continues on without double-freeing.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

parent c9d76a24

arch/x86/xen/time.c

+7 −4

Original line number	Diff line number	Diff line
		@@ -434,11 +434,14 @@ void xen_teardown_timer(int cpu)
		struct clock_event_device *evt;
		BUG_ON(cpu == 0);
		evt = &per_cpu(xen_clock_events, cpu).evt;

		if (evt->irq >= 0) {
		unbind_from_irqhandler(evt->irq, NULL);
		evt->irq = -1;
		kfree(per_cpu(xen_clock_events, cpu).name);
		per_cpu(xen_clock_events, cpu).name = NULL;
		}
		}

		void xen_setup_cpu_clockevents(void)
		{