linux-kernel - [PATCH 10/17] xen: pre-initialize legacy irqs early

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Date:	Wed, 27 May 2009 00:37:23 -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>,
	Greg KH <gregkh@...e.de>, Jens Axboe <jens.axboe@...cle.com>,
	Chris Wright <chrisw@...hat.com>, kurt.hackel@...cle.com,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ky Srinivasan <ksrinivasan@...ell.com>,
	Beulich <jbeulich@...ell.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Ian Campbell <ian.campbell@...rix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: [PATCH 10/17] xen: pre-initialize legacy irqs early

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

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

[ Impact: ISA/legacy device compat ]

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 af4e898..402a5bd 100644
--- a/arch/x86/xen/pci.c
+++ b/arch/x86/xen/pci.c
@@ -63,9 +63,9 @@ 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.
 	 */
@@ -77,4 +77,8 @@ 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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