Messages in this thread Patch in this message | | | Date | Thu, 12 Apr 2012 18:34:22 +0200 | From | Borislav Petkov <> | Subject | [PATCH 2/2] x86, microcode: Ensure that module is only loaded for |
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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.
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