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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-04-09 03:05:15 +0200
committerKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2013-04-16 22:05:14 +0200
commitef35a4e6d9eef3bd904b8c6b85618a2e878e801e (patch)
treeebb98bf24a457a4c48325625777408319e55a913 /arch/x86/xen/time.c
parentxen/events: Check that IRQ value passed in is valid. (diff)
downloadlinux-ef35a4e6d9eef3bd904b8c6b85618a2e878e801e.tar.xz
linux-ef35a4e6d9eef3bd904b8c6b85618a2e878e801e.zip
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>
Diffstat (limited to 'arch/x86/xen/time.c')
-rw-r--r--arch/x86/xen/time.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
index 054cc01bb849..3d88bfdf9e1c 100644
--- a/arch/x86/xen/time.c
+++ b/arch/x86/xen/time.c
@@ -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)