linux-kernel - [PATCH] xen/x86: actually allocate legacy interrupts on PV guests

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Message-ID: <alpine.DEB.2.10.1604201413070.23110@sstabellini-ThinkPad-X260>
Date:	Wed, 20 Apr 2016 14:15:01 +0100 (BST)
From:	Stefano Stabellini <sstabellini@...nel.org>
To:	boris.ostrovsky@...cle.com
cc:	sstabellini@...nel.org, linux-kernel@...r.kernel.org,
	david.vrabel@...rix.com, jgross@...e.com,
	xen-devel@...ts.xenproject.org
Subject: [PATCH] xen/x86: actually allocate legacy interrupts on PV guests

b4ff8389ed14 is incomplete: relies on nr_legacy_irqs() to get the number
of legacy interrupts when actually nr_legacy_irqs() returns 0 after
probe_8259A(). Use NR_IRQS_LEGACY instead.

Signed-off-by: Stefano Stabellini <sstabellini@...nel.org>

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index beac4df..349b8ce 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -491,8 +491,11 @@ int __init pci_xen_initial_domain(void)
 #endif
 	__acpi_register_gsi = acpi_register_gsi_xen;
 	__acpi_unregister_gsi = NULL;
-	/* Pre-allocate legacy irqs */
-	for (irq = 0; irq < nr_legacy_irqs(); irq++) {
+	/*
+	 * Pre-allocate the legacy IRQs.  Use NR_LEGACY_IRQS here
+	 * because we don't have a PIC and thus nr_legacy_irqs() is zero.
+	 */
+	for (irq = 0; irq < NR_IRQS_LEGACY; irq++) {
 		int trigger, polarity;
 
 		if (acpi_get_override_irq(irq, &trigger, &polarity) == -1)