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x86: Sanitize apb timer interrupt handling 

Disable the interrupt in CPU_DEAD where it belongs. Remove the
open coded irq_desc manipulation.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@elte.hu>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
This commit is contained in:
Thomas Gleixner 2010-09-28 11:11:10 +02:00
parent a3c08e5d80
commit a5ef2e7040
1 changed files with 24 additions and 30 deletions
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54
arch/x86/kernel/apb_timer.c
View File

@ -231,34 +231,6 @@ static void apbt_restart_clocksource(struct clocksource *cs)
apbt_start_counter(phy_cs_timer_id);
}
/* Setup IRQ routing via IOAPIC */
#ifdef CONFIG_SMP
static void apbt_setup_irq(struct apbt_dev *adev)
{
struct irq_chip *chip;
struct irq_desc *desc;
/* timer0 irq has been setup early */
if (adev->irq == 0)
return;
desc = irq_to_desc(adev->irq);
chip = get_irq_chip(adev->irq);
disable_irq(adev->irq);
desc->status |= IRQ_MOVE_PCNTXT;
irq_set_affinity(adev->irq, cpumask_of(adev->cpu));
/* APB timer irqs are set up as mp_irqs, timer is edge triggerred */
set_irq_chip_and_handler_name(adev->irq, chip, handle_edge_irq, "edge");
enable_irq(adev->irq);
if (system_state == SYSTEM_BOOTING)
if (request_irq(adev->irq, apbt_interrupt_handler,
IRQF_TIMER | IRQF_DISABLED | IRQF_NOBALANCING,
adev->name, adev)) {
printk(KERN_ERR "Failed request IRQ for APBT%d\n",
adev->num);
}
}
#endif
static void apbt_enable_int(int n)
{
unsigned long ctrl = apbt_readl(n, APBTMR_N_CONTROL);
@ -334,6 +306,27 @@ static int __init apbt_clockevent_register(void)
}
#ifdef CONFIG_SMP
static void apbt_setup_irq(struct apbt_dev *adev)
{
/* timer0 irq has been setup early */
if (adev->irq == 0)
return;
if (system_state == SYSTEM_BOOTING) {
irq_modify_status(adev->irq, 0, IRQ_MOVE_PCNTXT);
/* APB timer irqs are set up as mp_irqs, timer is edge type */
__set_irq_handler(adev->irq, handle_edge_irq, 0, "edge");
if (request_irq(adev->irq, apbt_interrupt_handler,
IRQF_TIMER | IRQF_DISABLED | IRQF_NOBALANCING,
adev->name, adev)) {
printk(KERN_ERR "Failed request IRQ for APBT%d\n",
adev->num);
}
} else
enable_irq(adev->irq);
}
/* Should be called with per cpu */
void apbt_setup_secondary_clock(void)
{
@ -389,10 +382,11 @@ static int apbt_cpuhp_notify(struct notifier_block *n,
switch (action & 0xf) {
case CPU_DEAD:
disable_irq(adev->irq);
apbt_disable_int(cpu);
if (system_state == SYSTEM_RUNNING)
if (system_state == SYSTEM_RUNNING) {
pr_debug("skipping APBT CPU %lu offline\n", cpu);
else if (adev) {
} else if (adev) {
pr_debug("APBT clockevent for cpu %lu offline\n", cpu);
free_irq(adev->irq, adev);
}