From: "Ky Srinivasan" <ksrinivasan@novell.com>
Subject: [PATCH] PV driver compatibility
Date: Wed, 20 Jan 2010 09:02:03 -0700
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The attached patch fixes what I believe is a typo and permits guests =
running the latest PV drivers to correctly interact with older back-ends.

Signed-off-by: K. Y. Srinivasan <ksrinivasan@novell.com>


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Make our PV drivers work  with older hosts that do not recognize the new =
PV driver protocol. =0A=0ASigned-off-by: K. Y. Srinivasan <ksrinivasan@nove=
ll.com>=0A=0AIndex: xen-4.0.0-testing/unmodified_drivers/linux-2.6/platform=
-pci/platform-pci.c=0A=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=0A--- xen-4.0.0-testing.orig/unmodified_drivers/linux-2.6/platform-pci/pla=
tform-pci.c	2009-12-22 06:23:01.000000000 -0700=0A+++ xen-4.0.0-testing=
/unmodified_drivers/linux-2.6/platform-pci/platform-pci.c	2010-01-06 =
12:50:53.000000000 -0700=0A@@ -284,7 +284,10 @@=0A =0A 	if (magic !=3D =
XEN_IOPORT_MAGIC_VAL) {=0A 		dev_err(dev, "invalid magic %#x", =
magic);=0A-		return -ENODEV;=0A+		/* =0A+		 * =
Older backend; just return 0 to be compatible.=0A+		 */=0A+		=
return 0;=0A 	}=0A =0A 	protocol =3D inb(XEN_IOPORT_PROTOVER);=0A
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