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xen/time: Free onlined per-cpu data structure if we want to online it again. 

If the per-cpu time data structure has been onlined already and
we are trying to online it again, then free the previous copy
before blindly over-writting it.

A developer naturally should not call this function multiple times
but just in case.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-06-04 17:13:29 -04:00
parent a05e2c371f
commit 09e99da766
1 changed files with 16 additions and 13 deletions
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29
arch/x86/xen/time.c
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@ -401,6 +401,20 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id)
return ret;
}
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_timer(int cpu)
{
char *name;
@ -409,6 +423,8 @@ void xen_setup_timer(int cpu)
evt = &per_cpu(xen_clock_events, cpu).evt;
WARN(evt->irq >= 0, "IRQ%d for CPU%d is already allocated\n", evt->irq, cpu);
if (evt->irq >= 0)
xen_teardown_timer(cpu);
printk(KERN_INFO "installing Xen timer for CPU %d\n", cpu);
@ -429,19 +445,6 @@ void xen_setup_timer(int cpu)
per_cpu(xen_clock_events, cpu).name = name;
}
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)
{