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[Xen-devel] [PATCH 04/12] Fix find_unbound_irq in presence of ioapic irq

To: linux-kernel@xxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 04/12] Fix find_unbound_irq in presence of ioapic irqs.
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Tue, 18 May 2010 11:22:59 +0100
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Don Dutile <ddutile@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Sheng Yang <sheng@xxxxxxxxxxxxxxx>
Delivery-date: Tue, 18 May 2010 03:29:26 -0700
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Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 drivers/xen/events.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 3523dbb..a137a2f 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -337,9 +337,18 @@ static int find_unbound_irq(void)
        int irq;
        struct irq_desc *desc;
 
-       for (irq = 0; irq < nr_irqs; irq++)
+       for (irq = 0; irq < nr_irqs; irq++) {
+               desc = irq_to_desc(irq);
+               /* only 0->15 have init'd desc; handle irq > 16 */
+               if (desc == NULL)
+                       break;
+               if (desc->chip == &no_irq_chip)
+                       break;
+               if (desc->chip != &xen_dynamic_chip)
+                       continue;
                if (irq_info[irq].type == IRQT_UNBOUND)
                        break;
+       }
 
        if (irq == nr_irqs)
                panic("No available IRQ to bind to: increase nr_irqs!\n");
-- 
1.5.4.3


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