linux-kernel - [PATCH 09/18] xen: pre-initialize legacy irqs early

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Date:	Thu,  7 May 2009 14:14:34 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 09/18] xen: pre-initialize legacy irqs early

From: Ian Campbell <ian.campbell@...rix.com>

Impact: ISA/legacy device compat

Various legacy devices, such as IDE, assume their legacy interrupts are
already initialized and are immediately usable.  Pre-initialize all the
legacy interrupts.

Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 arch/x86/xen/pci.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/pci.c b/arch/x86/xen/pci.c
index 0f3663c..fb408ce 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -62,9 +62,9 @@ int xen_register_gsi(u32 gsi, int triggering, int polarity)
 
 void __init xen_setup_pirqs(void)
 {
-#ifdef CONFIG_ACPI
 	int irq;
 
+#ifdef CONFIG_ACPI
 	/*
 	 * Set up acpi interrupt in acpi_gbl_FADT.sci_interrupt.
 	 */
@@ -76,4 +76,8 @@ void __init xen_setup_pirqs(void)
 	/* Blerk. */
 	acpi_gbl_FADT.sci_interrupt = irq;
 #endif
+
+	/* Pre-allocate legacy irqs */
+	for (irq=0; irq < NR_IRQS_LEGACY; irq++)
+		xen_allocate_pirq(irq);
 }
-- 
1.6.0.6

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