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kernel/x86-microcode-Ensure-that-module-is-only-loaded-for-supported-AMD-CPUs.patch

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From: Borislav Petkov <borislav.petkov@amd.com>
Newsgroups: gmane.linux.kernel
Subject: [PATCH 2/2] x86, microcode: Ensure that module is only loaded for
Date: Thu, 12 Apr 2012 18:34:22 +0200
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Cc: Andreas Herrmann <andreas.herrmann3@amd.com>,
Kay Sievers <kay.sievers@vrfy.org>,
Dave Jones <davej@redhat.com>, <linux-kernel@vger.kernel.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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From: Andreas Herrmann <andreas.herrmann3@amd.com>
Date: Thu, 12 Apr 2012 16:51:57 +0200
Subject: [PATCH 2/2] x86, microcode: Ensure that module is only loaded for supported AMD CPUs
Exit early when there's no support for a particular CPU family. Also,
fixup the "no support for this CPU vendor" to be issued only when the
driver is attempted to be loaded on an unsupported vendor.
Cc: stable@vger.kernel.org
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Cc: Borislav Petkov <borislav.petkov@amd.com>
[Boris: added a commit msg because Andreas is lazy]
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
---
arch/x86/kernel/microcode_amd.c | 12 +++++++-----
arch/x86/kernel/microcode_core.c | 6 +++---
2 files changed, 10 insertions(+), 8 deletions(-)
diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 73465aa..8a2ce8f 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -82,11 +82,6 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
{
struct cpuinfo_x86 *c = &cpu_data(cpu);
- if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
- pr_warning("CPU%d: family %d not supported\n", cpu, c->x86);
- return -1;
- }
-
csig->rev = c->microcode;
pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
@@ -380,6 +375,13 @@ static struct microcode_ops microcode_amd_ops = {
struct microcode_ops * __init init_amd_microcode(void)
{
+ struct cpuinfo_x86 *c = &cpu_data(0);
+
+ if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
+ pr_warning("AMD CPU family 0x%x not supported\n", c->x86);
+ return NULL;
+ }
+
patch = (void *)get_zeroed_page(GFP_KERNEL);
if (!patch)
return NULL;
diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
index d389e74..c9bda6d 100644
--- a/arch/x86/kernel/microcode_core.c
+++ b/arch/x86/kernel/microcode_core.c
@@ -526,11 +526,11 @@ static int __init microcode_init(void)
microcode_ops = init_intel_microcode();
else if (c->x86_vendor == X86_VENDOR_AMD)
microcode_ops = init_amd_microcode();
-
- if (!microcode_ops) {
+ else
pr_err("no support for this CPU vendor\n");
+
+ if (!microcode_ops)
return -ENODEV;
- }
microcode_pdev = platform_device_register_simple("microcode", -1,
NULL, 0);
--
1.7.8.4
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
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