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| author | Takashi Iwai <tiwai@suse.de> | 2008-12-24 11:04:08 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2008-12-24 11:04:08 +0100 |
| commit | 7645c4bfbb36f357f03815f5729c46ce8d89f008 (patch) | |
| tree | eb2c45bbdfc715a9a6e96e6af9675a0440ef8ff1 /arch/x86/kernel/microcode_intel.c | |
| parent | 74b7ff48a93f44198ac03cc4e628d713f53d4668 (diff) | |
| parent | 574f3c4f5c55e99ea60f71fd98cc54931d4b2eae (diff) | |
Merge branch 'fix/hda' into topic/hda
Diffstat (limited to 'arch/x86/kernel/microcode_intel.c')
| -rw-r--r-- | arch/x86/kernel/microcode_intel.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/x86/kernel/microcode_intel.c b/arch/x86/kernel/microcode_intel.c index 622dc4a2178..a8e62792d17 100644 --- a/arch/x86/kernel/microcode_intel.c +++ b/arch/x86/kernel/microcode_intel.c @@ -155,6 +155,7 @@ static DEFINE_SPINLOCK(microcode_update_lock); static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) { struct cpuinfo_x86 *c = &cpu_data(cpu_num); + unsigned long flags; unsigned int val[2]; memset(csig, 0, sizeof(*csig)); @@ -174,11 +175,16 @@ static int collect_cpu_info(int cpu_num, struct cpu_signature *csig) csig->pf = 1 << ((val[1] >> 18) & 7); } + /* serialize access to the physical write to MSR 0x79 */ + spin_lock_irqsave(µcode_update_lock, flags); + wrmsr(MSR_IA32_UCODE_REV, 0, 0); /* see notes above for revision 1.07. Apparent chip bug */ sync_core(); /* get the current revision from MSR 0x8B */ rdmsr(MSR_IA32_UCODE_REV, val[0], csig->rev); + spin_unlock_irqrestore(µcode_update_lock, flags); + pr_debug("microcode: collect_cpu_info : sig=0x%x, pf=0x%x, rev=0x%x\n", csig->sig, csig->pf, csig->rev); |