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xen: fix unbind_from_irq() 

Rearrange the tests in unbind_from_irq() so that we can still unbind
an irq even if the underlying event channel is bad.  This allows a
device driver to shuffle its irqs on save/restore before the
underlying event channels have been fixed up.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jeremy Fitzhardinge 2008-05-26 23:31:24 +01:00 committed by Thomas Gleixner
parent eb1e305f4e
commit 0f2287ad7c
1 changed files with 2 additions and 2 deletions
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4
drivers/xen/events.c
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@ -355,7 +355,7 @@ static void unbind_from_irq(unsigned int irq)
spin_lock(&irq_mapping_update_lock); spin_lock(&irq_mapping_update_lock);
if (VALID_EVTCHN(evtchn) && (--irq_bindcount[irq] == 0)) { if ((--irq_bindcount[irq] == 0) && VALID_EVTCHN(evtchn)) {
close.port = evtchn; close.port = evtchn;
if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0) if (HYPERVISOR_event_channel_op(EVTCHNOP_close, &close) != 0)
BUG(); BUG();
@ -375,7 +375,7 @@ static void unbind_from_irq(unsigned int irq)
evtchn_to_irq[evtchn] = -1; evtchn_to_irq[evtchn] = -1;
irq_info[irq] = IRQ_UNBOUND; irq_info[irq] = IRQ_UNBOUND;
dynamic_irq_init(irq); dynamic_irq_cleanup(irq);
} }
spin_unlock(&irq_mapping_update_lock); spin_unlock(&irq_mapping_update_lock);