Patch "xen/x86: actually allocate legacy interrupts on PV guests" has been added to the 4.4-stable tree

Patch "xen/x86: actually allocate legacy interrupts on PV guests" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    xen/x86: actually allocate legacy interrupts on PV guests

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     xen-x86-actually-allocate-legacy-interrupts-on-pv-guests.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 702f926067d2a4b28c10a3c41a1172dd62d9e735 Mon Sep 17 00:00:00 2001
From: Stefano Stabellini <sstabellini@kernel.org>
Date: Wed, 20 Apr 2016 14:15:01 +0100
Subject: xen/x86: actually allocate legacy interrupts on PV guests

From: Stefano Stabellini <sstabellini@kernel.org>

commit 702f926067d2a4b28c10a3c41a1172dd62d9e735 upstream.

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@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/pci/xen.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -488,8 +488,11 @@ 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)


Patches currently in stable-queue which might be from sstabellini@kernel.org are

queue-4.4/xen-x86-actually-allocate-legacy-interrupts-on-pv-guests.patch