From a05e2c371fbe73403793d126ceab93787cb4afd4 Mon Sep 17 00:00:00 2001 From: Konrad Rzeszutek Wilk Date: Tue, 4 Jun 2013 17:11:52 -0400 Subject: [PATCH] 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 --- arch/x86/xen/time.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index 011f1bf..6a56ae0 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -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) -- 2.7.4