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Path: news.gmane.org!not-for-mail
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From: Borislav Petkov <borislav.petkov@amd.com>
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Newsgroups: gmane.linux.kernel
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Subject: [PATCH 2/2] x86, microcode: Ensure that module is only loaded for
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Date: Thu, 12 Apr 2012 18:34:22 +0200
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Lines: 80
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Message-ID: <20120412163422.GM24549@aftab>
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References: <20120411163849.GE4794@alberich.amd.com>
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<20120411200601.GC12288@kroah.com>
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NNTP-Posting-Date: Thu, 12 Apr 2012 16:35:00 +0000 (UTC)
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Cc: Andreas Herrmann <andreas.herrmann3@amd.com>,
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Kay Sievers <kay.sievers@vrfy.org>,
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Dave Jones <davej@redhat.com>, <linux-kernel@vger.kernel.org>
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To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Xref: news.gmane.org gmane.linux.kernel:1281050
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Archived-At: <http://permalink.gmane.org/gmane.linux.kernel/1281050>
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From: Andreas Herrmann <andreas.herrmann3@amd.com>
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Date: Thu, 12 Apr 2012 16:51:57 +0200
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Subject: [PATCH 2/2] x86, microcode: Ensure that module is only loaded for supported AMD CPUs
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Exit early when there's no support for a particular CPU family. Also,
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fixup the "no support for this CPU vendor" to be issued only when the
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driver is attempted to be loaded on an unsupported vendor.
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Cc: stable@vger.kernel.org
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Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
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Cc: Borislav Petkov <borislav.petkov@amd.com>
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[Boris: added a commit msg because Andreas is lazy]
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Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
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---
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arch/x86/kernel/microcode_amd.c | 12 +++++++-----
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arch/x86/kernel/microcode_core.c | 6 +++---
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2 files changed, 10 insertions(+), 8 deletions(-)
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diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
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index 73465aa..8a2ce8f 100644
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--- a/arch/x86/kernel/microcode_amd.c
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+++ b/arch/x86/kernel/microcode_amd.c
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@@ -82,11 +82,6 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
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{
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struct cpuinfo_x86 *c = &cpu_data(cpu);
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- if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
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- pr_warning("CPU%d: family %d not supported\n", cpu, c->x86);
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- return -1;
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- }
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-
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csig->rev = c->microcode;
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pr_info("CPU%d: patch_level=0x%08x\n", cpu, csig->rev);
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@@ -380,6 +375,13 @@ static struct microcode_ops microcode_amd_ops = {
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struct microcode_ops * __init init_amd_microcode(void)
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{
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+ struct cpuinfo_x86 *c = &cpu_data(0);
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+
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+ if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
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+ pr_warning("AMD CPU family 0x%x not supported\n", c->x86);
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+ return NULL;
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+ }
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+
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patch = (void *)get_zeroed_page(GFP_KERNEL);
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if (!patch)
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return NULL;
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diff --git a/arch/x86/kernel/microcode_core.c b/arch/x86/kernel/microcode_core.c
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index d389e74..c9bda6d 100644
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--- a/arch/x86/kernel/microcode_core.c
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+++ b/arch/x86/kernel/microcode_core.c
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@@ -526,11 +526,11 @@ static int __init microcode_init(void)
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microcode_ops = init_intel_microcode();
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else if (c->x86_vendor == X86_VENDOR_AMD)
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microcode_ops = init_amd_microcode();
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-
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- if (!microcode_ops) {
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+ else
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pr_err("no support for this CPU vendor\n");
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+
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+ if (!microcode_ops)
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return -ENODEV;
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- }
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microcode_pdev = platform_device_register_simple("microcode", -1,
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NULL, 0);
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--
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1.7.8.4
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--
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Regards/Gruss,
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Boris.
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Advanced Micro Devices GmbH
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Einsteinring 24, 85609 Dornach
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GM: Alberto Bozzo
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Reg: Dornach, Landkreis Muenchen
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HRB Nr. 43632 WEEE Registernr: 129 19551
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