linux-kernel - [PATCH 07/13] Fix find_unbound_irq in presence of ioapic irqs.

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Message-Id: <1277136847-13266-7-git-send-email-stefano@stabellini.net>
Date:	Mon, 21 Jun 2010 17:14:01 +0100
From:	stefano@...bellini.net
To:	linux-kernel@...r.kernel.org
Cc:	xen-devel@...ts.xensource.com, Stefano.Stabellini@...citrix.com,
	sheng@...ux.intel.com, ddutile@...hat.com, jeremy@...p.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Subject: [PATCH 07/13] Fix find_unbound_irq in presence of ioapic irqs.

From: Stefano Stabellini <stefano.stabellini@...citrix.com>

Don't break the assumption that the first 16 irqs are ISA irqs;
make sure that the irq is actually free before using it.

Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
---
 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 0f7546e..b029a32 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -340,9 +340,18 @@ 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");
-- 
1.7.0.4

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