From: Gerd Hoffmann <kraxel@redhat.com>
Subject: [RHEL5.1 patch] xen, bug 237434: fix microcode driver for new firmware
Date: Fri, 11 May 2007 15:27:36 +0200
Bugzilla: 237434
Message-Id: <46446F48.80706@redhat.com>
Changelog: [misc] xen: fix microcode driver for new firmware


  Hi,

bug 237434

This patch makes the kernel-xen microcode driver _not_ barf on newer, 
smaller firmware updates.

Backported from 3.1, rediffed against RHEL5 kernel + previously posted 
microcode patch.

cheers,
  Gerd

# HG changeset patch
# User kfraser@localhost.localdomain
# Date 1169045933 0
# Node ID 9fa13c7ebf8a650d515a2ddbafb49cf0932d736b
# Parent  e303a2f329ee6bdd935f3b80f322ce93efd1672b
linux: Allow microcode updates of smaller than default size.
Signed-off-by: Kurt Garloff <kurt@garloff.de>

---
 arch/i386/kernel/microcode-xen.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.18.noarch/arch/i386/kernel/microcode-xen.c
===================================================================
--- linux-2.6.18.noarch.orig/arch/i386/kernel/microcode-xen.c
+++ linux-2.6.18.noarch/arch/i386/kernel/microcode-xen.c
@@ -87,7 +87,7 @@ static ssize_t microcode_write (struct f
 {
 	ssize_t ret;
 
-	if (len < DEFAULT_UCODE_TOTALSIZE) {
+	if (len < MC_HEADER_SIZE) {
 		printk(KERN_ERR "microcode: not enough data\n"); 
 		return -EINVAL;
 	}