x86: ucode-amd: Move family check to microcde_amd.c's init function

... to avoid useless trial to load firmware on systems with
unsupported AMD CPUs.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Dmitry Adamushko <dmitry.adamushko@gmail.com>
Cc: Mike Travis <travis@sgi.com>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Cc: Andreas Mohr <andi@lisas.de>
Cc: Jack Steiner <steiner@sgi.com>
LKML-Reference: <20091117070638.GA27691@alberich.amd.com>
[ v2: changed BUG_ON() to WARN_ON() ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 15 insertions, 6 deletions

diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index 26e33bd8485b..63123d902103 100644
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -34,6 +34,7 @@ MODULE_LICENSE("GPL v2");
 #define UCODE_UCODE_TYPE           0x00000001
 
 const struct firmware *firmware;
+static int supported_cpu;
 
 struct equiv_cpu_entry {
         u32     installed_cpu;
@@ -73,15 +74,12 @@ static struct equiv_cpu_entry *equiv_cpu_table;
 
 static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 {
-        struct cpuinfo_x86 *c = &cpu_data(cpu);
         u32 dummy;
 
-        memset(csig, 0, sizeof(*csig));
-        if (c->x86_vendor != X86_VENDOR_AMD || c->x86 < 0x10) {
-                pr_warning("microcode: CPU%d: AMD CPU family 0x%x not "
-                           "supported\n", cpu, c->x86);
+        if (!supported_cpu)
                 return -1;
-        }
+
+        memset(csig, 0, sizeof(*csig));
         rdmsr(MSR_AMD64_PATCH_LEVEL, csig->rev, dummy);
         pr_info("microcode: CPU%d: patch_level=0x%x\n", cpu, csig->rev);
         return 0;
@@ -331,6 +329,17 @@ static void microcode_fini_cpu_amd(int cpu)
 void init_microcode_amd(struct device *device)
 {
         const char *fw_name = "amd-ucode/microcode_amd.bin";
+        struct cpuinfo_x86 *c = &boot_cpu_data;
+
+        WARN_ON(c->x86_vendor != X86_VENDOR_AMD);
+
+        if (c->x86 < 0x10) {
+                pr_warning("microcode: AMD CPU family 0x%x not supported\n",
+                           c->x86);
+                return;
+        }
+        supported_cpu = 1;
+
         if (request_firmware(&firmware, fw_name, device))
                 pr_err("microcode: failed to load file %s\n", fw_name);
 }