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x86, microcode: Ensure that module is only loaded on supported AMD CPUs

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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>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: http://lkml.kernel.org/r/20120411163849.GE4794@alberich.amd.com
[Boris: add a commit msg because Andreas is lazy]
Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
This commit is contained in:
Andreas Herrmann 2012-04-12 16:51:57 +02:00 committed by Borislav Petkov
parent a956bd6f85
commit 283c1f2558
2 changed files with 10 additions and 8 deletions
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12
arch/x86/kernel/microcode_amd.c
View File

@ -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;

6
arch/x86/kernel/microcode_core.c
View File

@ -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);