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xen/time: Add default value of -1 for IRQ and check for that. 

If the timer interrupt has been de-init or is just now being
initialized, the default value of -1 should be preset as
interrupt line. Check for that and if something is odd
WARN us.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-04-08 21:05:15 -04:00
parent 94032c5067
commit ef35a4e6d9
1 changed files with 5 additions and 2 deletions
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7
arch/x86/xen/time.c
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@ -377,7 +377,7 @@ static const struct clock_event_device xen_vcpuop_clockevent = {
static const struct clock_event_device *xen_clockevent =
&xen_timerop_clockevent;
static DEFINE_PER_CPU(struct clock_event_device, xen_clock_events);
static DEFINE_PER_CPU(struct clock_event_device, xen_clock_events) = { .irq = -1 };
static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
{
@ -401,6 +401,9 @@ void xen_setup_timer(int cpu)
struct clock_event_device *evt;
int irq;
evt = &per_cpu(xen_clock_events, cpu);
WARN(evt->irq >= 0, "IRQ%d for CPU%d is already allocated\n", evt->irq, cpu);
printk(KERN_INFO "installing Xen timer for CPU %d\n", cpu);
name = kasprintf(GFP_KERNEL, "timer%d", cpu);
@ -413,7 +416,6 @@ void xen_setup_timer(int cpu)
IRQF_FORCE_RESUME,
name, NULL);
evt = &per_cpu(xen_clock_events, cpu);
memcpy(evt, xen_clockevent, sizeof(*evt));
evt->cpumask = cpumask_of(cpu);
@ -426,6 +428,7 @@ void xen_teardown_timer(int cpu)
BUG_ON(cpu == 0);
evt = &per_cpu(xen_clock_events, cpu);
unbind_from_irqhandler(evt->irq, NULL);
evt->irq = -1;
}
void xen_setup_cpu_clockevents(void)