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

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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>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-06-04 17:11:52 -04:00
parent c9d76a24a2
commit a05e2c371f
1 changed files with 7 additions and 4 deletions
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11
arch/x86/xen/time.c
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@ -434,10 +434,13 @@ void xen_teardown_timer(int cpu)
struct clock_event_device *evt;
BUG_ON(cpu == 0);
evt = &per_cpu(xen_clock_events, cpu).evt;
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;
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)