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xen: remove irq bindcount

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There should be no need for us to maintain our own bind count for
irqs, since the surrounding irq system should keep track of shared
irqs for us.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge 2009-02-06 14:09:45 -08:00 committed by Ingo Molnar
parent ced40d0f3e
commit d77bbd4db4
1 changed files with 7 additions and 19 deletions
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26
drivers/xen/events.c
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@ -54,7 +54,7 @@ static DEFINE_PER_CPU(int, ipi_to_irq[XEN_NR_IPIS]) = {[0 ... XEN_NR_IPIS-1] = -
/* Interrupt types. */
enum xen_irq_type {
IRQT_UNBOUND,
IRQT_UNBOUND = 0,
IRQT_PIRQ,
IRQT_VIRQ,
IRQT_IPI,
@ -102,9 +102,6 @@ static inline unsigned long *cpu_evtchn_mask(int cpu)
return cpu_evtchn_mask_p[cpu].bits;
}
/* Reference counts for bindings to IRQs. */
static int irq_bindcount[NR_IRQS];
/* Xen will never allocate port zero for any purpose. */
#define VALID_EVTCHN(chn) ((chn) != 0)
@ -330,9 +327,8 @@ static int find_unbound_irq(void)
int irq;
struct irq_desc *desc;
/* Only allocate from dynirq range */
for (irq = 0; irq < nr_irqs; irq++)
if (irq_bindcount[irq] == 0)
if (irq_info[irq].type == IRQT_UNBOUND)
break;
if (irq == nr_irqs)
@ -365,8 +361,6 @@ int bind_evtchn_to_irq(unsigned int evtchn)
irq_info[irq] = mk_evtchn_info(evtchn);
}
irq_bindcount[irq]++;
spin_unlock(&irq_mapping_update_lock);
return irq;
@ -403,8 +397,6 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
bind_evtchn_to_cpu(evtchn, cpu);
}
irq_bindcount[irq]++;
out:
spin_unlock(&irq_mapping_update_lock);
return irq;
@ -441,8 +433,6 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
bind_evtchn_to_cpu(evtchn, cpu);
}
irq_bindcount[irq]++;
spin_unlock(&irq_mapping_update_lock);
return irq;
@ -455,7 +445,7 @@ static void unbind_from_irq(unsigned int irq)
spin_lock(&irq_mapping_update_lock);
if ((--irq_bindcount[irq] == 0) && VALID_EVTCHN(evtchn)) {
if (VALID_EVTCHN(evtchn)) {
close.port = evtchn;
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
BUG();
@ -681,6 +671,8 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
/* Rebind a new event channel to an existing irq. */
void rebind_evtchn_irq(int evtchn, int irq)
{
struct irq_info *info = info_for_irq(irq);
/* Make sure the irq is masked, since the new event channel
will also be masked. */
disable_irq(irq);
@ -690,8 +682,8 @@ void rebind_evtchn_irq(int evtchn, int irq)
/* After resume the irq<->evtchn mappings are all cleared out */
BUG_ON(evtchn_to_irq[evtchn] != -1);
/* Expect irq to have been bound before,
so the bindcount should be non-0 */
BUG_ON(irq_bindcount[irq] == 0);
so there should be a proper type */
BUG_ON(info->type == IRQT_UNBOUND);
evtchn_to_irq[evtchn] = irq;
irq_info[irq] = mk_evtchn_info(evtchn);
@ -948,9 +940,5 @@ void __init xen_init_IRQ(void)
for (i = 0; i < NR_EVENT_CHANNELS; i++)
mask_evtchn(i);
/* Dynamic IRQ space is currently unbound. Zero the refcnts. */
for (i = 0; i < nr_irqs; i++)
irq_bindcount[i] = 0;
irq_ctx_init(smp_processor_id());
}