linux-kernel - [tip:x86/urgent] x86/microcode: Ensure that module is only loaded on supported Intel CPUs

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Message-ID: <tip-7164b3f5e5461b58baa82e82544ca5af71af287b@git.kernel.org>
Date:	Mon, 7 May 2012 21:28:40 -0700
From:	"tip-bot for Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	kay.sievers@...y.org, andreas.herrmann3@....com, davej@...hat.com,
	srivatsa.bhat@...ux.vnet.ibm.com, gregkh@...uxfoundation.org,
	tglx@...utronix.de, borislav.petkov@....com
Subject: [tip:x86/urgent] x86/microcode:
  Ensure that module is only loaded on supported Intel CPUs

Commit-ID:  7164b3f5e5461b58baa82e82544ca5af71af287b
Gitweb:     http://git.kernel.org/tip/7164b3f5e5461b58baa82e82544ca5af71af287b
Author:     Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
AuthorDate: Mon, 16 Apr 2012 14:12:00 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 7 May 2012 14:37:14 +0200

x86/microcode: Ensure that module is only loaded on supported Intel CPUs

Exit early when there's no support for a particular CPU family.

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Andreas Herrmann <andreas.herrmann3@....com>
Cc: Kay Sievers <kay.sievers@...y.org>
Cc: Dave Jones <davej@...hat.com>
Cc: tigran@...azian.fsnet.co.uk
Cc: Borislav Petkov <borislav.petkov@....com>
Link: http://lkml.kernel.org/r/4F8BDB58.6070007@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/microcode_intel.c |   14 ++++++++------
 1 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c
index 3ca42d0..0327e2b 100644
--- a/arch/x86/kernel/microcode_intel.c
+++ b/arch/x86/kernel/microcode_intel.c
@@ -147,12 +147,6 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig)
 
 	memset(csig, 0, sizeof(*csig));
 
-	if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
-	    cpu_has(c, X86_FEATURE_IA64)) {
-		pr_err("CPU%d not a capable Intel processor\n", cpu_num);
-		return -1;
-	}
-
 	csig->sig = cpuid_eax(0x00000001);
 
 	if ((c->x86_model >= 5) || (c->x86 > 6)) {
@@ -463,6 +457,14 @@ static struct microcode_ops microcode_intel_ops = {
 
 struct microcode_ops * __init init_intel_microcode(void)
 {
+	struct cpuinfo_x86 *c = &cpu_data(0);
+
+	if (c->x86_vendor != X86_VENDOR_INTEL || c->x86 < 6 ||
+	    cpu_has(c, X86_FEATURE_IA64)) {
+		pr_err("Intel CPU family 0x%x not supported\n", c->x86);
+		return NULL;
+	}
+
 	return &microcode_intel_ops;
 }
 
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